QUALITY OPERATIONS STANDARD TITLE: SELLER REQUIREMENTS FOR TEMPER INSPECTION BY ELECTRICAL MEASUREMENT AND/OR HARDNESS MEASUREMENT Standard Number: QOS - 0021 Revision Letter: E Effective Date: 07/31/12 PREPARED BY: *Kevin Cook APPROVED BY: * John Munyak Mgr. Special Programs, Technical Services Manager, Technical Services APPROVED BY: * R. Pucci Technical Specialist, E-2C Program Quality REVISIONS * Approvals on file DATE REV. REV. BY DESCRIPTION RATIONALE 2/01/05 B W.D./R.P. Update format, clarify requirements Clarify Hardness and Conductivity requirements 10/17/05 C W.D./R.P. Restrict heat treat operations on final temper parts, table V & VII revisions. 03/21/08 D W.D./R.P. Allow conductivity only testing for Al. alloys in original mill supplied temper 7/31/12 E R.P. Revised document for Electrical Conductivity readings on parts. Added values for additional alloy and temper. Address heat treatment of as received material. Add thin material readings. Occasionally mill produced material does not meet QOS 0021 requirements, tensile testing produces satisfactory requirements. Clarified the number of measurements required on parts. Additional material add in table V. (516) 575-3767 Page 1 of 40
I. CONTENTS: Section Page II. Scope 3 III. Purpose 3 IV. Associated Documents 4 V. Certification of Personnel 4 VI. Quality Control 4 VII. Requirements 4 VIII. Definitions 5 IX. Hardness Testing Procedure 6 X. Electrical Conductivity Procedure 7,8,9 XI. Tables : Summary - Examples 11,12 Table I - Hardness-Thickness Chart Aluminum Alloys 13 Table II - Hardness Corrections Surface Curvature 14 Table III - Hardness Corrections Surface Curvature 15 Table IV - Rockwell Hardness & Electrical Conductivity Al. Plate 16 Table V - Hardness Requirements for Wrought Aluminum Alloys Excluding Plate 17,18,19 Table VI Hardness Requirements for Aluminum Alloy Castings 20 Table VII Electrical Conductivity Requirements Wrought Aluminum Alloys.063 Inch Thick and Above Excluding Plate 21 Table VIII Electrical Conductivity Correction Factors for Bare Thin Gauge Aluminum 22,23 Table IX Electrical Conductivity Correction Factors for 2024,7075, 7079, 7178 Clad Aluminum 24 Table X Electrical Conductivity Correction Factors for 2014 and 2219 Clad Aluminum Alloys 25 Table XI Electrical Conductivity Correction Factors for 3003 and 6061 Clad Aluminum Alloys 26,27 Table XII Electrical Conductivity Correction Factors for Curved Surfaces 28,29,30 Table XIII Hardness Thickness Chart Steels 31 (516) 575-3767 Page 2 of 40
I. CONTENTS: (continued) Section XI. Tables: (continued) Table XIV Hardness Correction Factors Surface Curvature -Steel 32 Table XV Hardness Correction Factors Surface Curvature-Steel 33 Table XVI Hardness Requirements for Wrought 300 Series Stainless Steels 34 Table XVII Rockwell Hardness to Strength Relationship for Low Alloy Steels 35 Table XVIII Rockwell Conversion Values Between Scales - Steel 36 Table XIX Frequeny of Hardness Testing Steel 37 Table XX Rockwell Hardness Requirements for Magnesium Alloy Castings 38 Table XXI Rockwell Hardness Requirements for Copper Alloys 39,40 II. SCOPE: Sellers shall use this specification to verify the temper requirements of the applicable Northrop Grumman purchase order, material specification and/or engineering drawing. III. PURPOSE: This document describes the requirements for final temper inspection and part acceptance of aluminum alloys, steel alloys, cast magnesium alloys, and copper alloys by electrical conductivity measurements and/or hardness testing. The electrical conductivity and hardness values listed in this document shall be utilized to verify temper for final part acceptance. Values measured not meeting these requirements shall be submitted via an RCI for evaluation. These tables apply to all parts in their final temper as specified within. The origin of the final heat treatment is not a factor affecting the use of these tables. Unless otherwise stated on the Engineering drawing or material specification, the electrical conductivity and hardness requirements listed in this document shall apply. Measurements that do not meet the electrical conductivity and hardness values specified on the Engineering Drawing shall be submitted via a SMRR (Seller Material Review Report) per QOS-0035. For aluminum alloys in the original mill supplied temper, where no re-heat treatment was performed, the following applies: Inspection of this product shall consist of conductivity only. Hardness inspection is not required. When no conductivity value is provided in the applicable material specification the values in QOS-0021 shall be used. (516) 575-3767 Page 3 of 40
III. PURPOSE: (continued) NOTE: Material requirements on some NGC drawings reference materials that are received in a final temper condition. These are materials whose final temper condition is only produced from a mill. An example is Aluminum alloy 7050-T76511 extrusion. If the drawings pertaining to these materials does not contain a process code for heat treatment or hot forming (hot forming allows re-heat treatment under certain conditions) these parts may not be heat treated, annealed, or aged in the process of part manufacture. The intent of these drawings is to manufacture the part from the material in its as supplied final temper. IV. ASSOCIATED DOCUMENTS: The current issue of the following documents shall be considered a part of this specification to the extent indicated herein. ANSI/ASTM E18 Standard Test Methods for Rockwell Superficial Hardness of Metallic Materials MIL-STD-1537 QOS-0035 Electrical Conductivity Test for Measurement of Heat Treatment of Aluminum Alloys, Eddy Current Method Guidelines for Supplier Preparation & Processing of Seller Material Review Report (SMRR) V. CERTIFICATION OF PERSONNEL: Personnel shall posses the necessary skills, background and training required to satisfactorily perform the testing as specified herein. VI. QUALITY CONTROL: Sellers Quality personnel shall assure that the requirements of this specification are met by monitoring the process and examine the end items in accordance with the established and approved quality assurance provisions. Questions/concerns relative to this document shall be submitted on the Request for Change/Information form (P0-F030) located on Oasis, Contract Data-Forms. (516) 575-3767 Page 4 of 40
VII. REQUIREMENTS: Materials covered by this specification shall meet the hardness and/or electrical conductivity requirements as listed in the applicable tables herein, unless otherwise specified on engineering drawings or referenced specifications. VIII. DEFINITIONS: The following definitions shall apply to terms that have uncommon or special meaning as used in this specification. Aluminum Alloy Plate - A rolled product rectangular in cross section with thickness of 0.250 inch or more in nominal thickness. Direct Reading Conductivity Instrument An analog or digital electronic instrument and probe that displays the conductivity of a nonferrous metal under test in percent IACS. Edge Effect The disturbance of the magnetic field and eddy currents due to the proximity of an abrupt change in specimen geometry (edge). Lift Off The effect observed in the electromagnetic test system output due to a change in magnetic coupling between a test specimen and a probe coil whenever the distance between them is varied. International Annealed Copper Standard (IACS) An internationally recognized standard of electrical conductivity where copper equals a designation value of 100. (516) 575-3767 Page 5 of 40
IX. HARDNESS TESTING PROCEDURE: The procedure specified in American Society for Testing and Materials test method procedure ANSI/ASTM E-18 and applicable equipment operation manuals shall be used for all hardness testing. With the exception of cladding on aluminum materials (refer to applicable table), hardness shall be performed on bare material surfaces whenever possible. Surface conditions, such as, but not limited to, coatings, surface treatments and/or finishes may interfere with temper inspection. Refer to the applicable inspection specification and/or engineering organization for specific inspection requirements through surface conditions. Removal and subsequent restoration of pre-inspection surface finish, when required, shall be coordinated with the applicable Northrop Grumman engineering section. Surface preparation shall be described in ANSI/ASTM E-18. Only calibrated/certified hardness test instruments may be used. Note 1: Rockwell Standard Hardness Abbreviations: All hardness designations have been abbreviated due to space limitations on the chart(s), i.e.; B, 15T scale etc. refers to HRB, HR15T. This is the standard industry practice to express Rockwell hardness. Note 2: Specification ASTM E18 requires for Rockwell B scale the use of a carbide ball penetrator. Carbide balls have superseded the former use of steel balls. Rockwell B scale readings using the carbide ball penetrator shall be designated as HRBW. (516) 575-3767 Page 6 of 40
X. ELECTRICAL CONDUCTIVITY PROCEDURE: The procedures specified in MIL-STD-1537 shall be used with the following additional requirements: Only a direct reading electrical conductivity test instrument operating at a frequency of 60 KHz (+/-5 KHz) shall be used. For the purposes of standardization and simplification, conductivity tables for special conditions such as: thin gauge, clad aluminum, surface curvature, edge effect, and surface coatings, have been developed using the Hocking Autosigma 2000, test instrument and (0.71 inch diameter) straight probe system. When correction factors are needed to cover other conductivity test instruments or conditions, contact the Technical Services Laboratory for further instructions. Only calibrated/certified test instruments and standards may be used. Certification will be performed at least annually using a documented procedure. Lift-off shall not exceed.020 inch in order to maintain system accuracy. The lift-off check (paragraph 4.3.1.2) of MIL-STD-1537 shall be performed daily for all instruments used. If you do not know your instrument lift-off limitation, conductivity readings or part/material with nonconductive coatings greater than 0.003 inch in thickness shall not be used to accept/reject unless the following procedure is used: a. Obtain average thickness of nonconductive coating on inspection part/material. Use an Isoscope or equivalent to determine coating thickness. b. Place probe on conductivity reference standard closest to expected inspection part/material conductivity and note percent IACS. c. Place a nonconductive shim, equivalent to inspection part coating thickness, on the standard. Place probe on shim and note percent IACS value. Proceed with inspection if; 1. The difference between readings is not more than 0.5 percent IACS. 2. The difference between readings is greater than 0.5 percent IACS and the nonconductive coating has been removed from the inspection surface. (Use bare material values when excessive nonconductive coatings are removed.) (516) 575-3767 Page 7 of 40
X. ELECTRICAL CONDUCTIVITY PROCEDURE: (continued) 3. The difference between readings is greater than 0.5 percent IACS and lift-off correction factors are available for your conductivity test instrument. Conductivity testing shall be performed at sufficient locations to ensure that the entire part meets the requirements. a. At a minimum, three (3) readings are required. One on each end and one in the middle of the part. b. The minimum and maximum values of all readings taken shall be recorded. c. For each individual part, all values must be in the required range and the maximum allowable variation across all measurements is 3% IACS. For example, The acceptable range for bare 0.063 7075-T6 aluminum is 29.5 34.5. If the minimum reading is 30.5%, the maximum acceptable reading is 33.5%. Each instrument shall be equipped with a minimum of three standards. One of these standards shall be in the 25 to 32 percent IACS range, one in the 37 to 43 percent IACS range and one in the 49 to 61 percent IACS range. These standards shall be used for all standardization procedures. Verification of acceptable temperature compatibility (+/- 2 F) between the test instrument probe, conductivity standards, inspection area and parts/materials shall be performed prior to testing initiation. Parts/materials and test systems that have remained in the same inspection area/condition for a minimum of 1 hour are considered acceptable. A touch temperature probe may be used to verify temperature acceptability at anytime. If temperatures are not +/- 2 F, allow the parts/material and test system to remain in the inspection area until they meet temperature requirements. The material/parts tested shall have a surface finish of Ra 150 or finer and shall be free from visible oil, grease, dirt or contaminants. The specimen area to which the eddy current instrument probe is applied shall be at least as large as the eddy current field generated by the probe. This can be determined by placing the probe on a flat test specimen and moving it towards an edge while observing the reading. The distance from the center of the probe to the edge at the point when the readings begin to change is the radius of the probe field. Twice the value of this radius therefore represents the minimum diameter of a circular area required for valid conductivity measurements. (516) 575-3767 Page 8 of 40
Materials covered in this specification shall meet the respective electrical conductivity and/or hardness values as listed in the appropriate tables, as applicable, unless otherwise specified on engineering drawings or referenced specifications. Special considerations for thickness effects, surface curvature and cladding of aluminum alloys have been addressed in accordance with the requirements of the respective tables. X. ELECTRICAL CONDUCTIVITY PROCEDURE: (continued) Other conductivity test instruments equivalent to the Hocking Autosigma 2000 may be used. Operating frequency shall be 60KHz +/- 5KHz. XI. TABLES: 1. Aluminum Alloys Table I establishes the hardness scales that shall be used with aluminum alloys of the specified thicknesses. Tables II and III establish the hardness corrections to be added to compensate for surface curvature. Table IV establishes the Rockwell Hardness and Electrical Conductivity requirements for aluminum alloy plate. Table V establishes Rockwell Hardness requirements for wrought aluminum alloys exclusive of plate. Table VI establishes the Rockwell Hardness requirements for cast aluminum alloys. Table VII establishes the Electrical Conductivity requirements for aluminum.063 inch in cross sectional thickness and above, exclusive of plate. Table VIII establishes the Electrical Conductivity Correction Factors for Bare Thin Gauge Aluminum. (Hocking Autosigma 2000) Table IX, X, and XI establish the Electrical Conductivity Factors for Clad Aluminum of various alloys. Table XII establishes the Electrical Conductivity Correction Factors for curved surfaces. Notes: 1. Electrical conductivity and/or hardness testing methods may not be used for part acceptance if the required heat treat procedure or cycle has been violated. (516) 575-3767 Page 9 of 40
2. Combination of Correction Factors for multiple conditions is prohibited unless authorized by the Technical Services Laboratory. XI. TABLES: (continued) 2. Steels 3. Aluminum alloys shall be 100% electrical conductivity tested. From each lot, perform hardness testing on the two parts having the maximum and minimum electrical conductivity values. Parts not conducive to electrical conductivity testing due to factors such as geometry and/or thickness limitations shall be 100% hardness tested in lieu of electrical conductivity testing. Table XIII establishes the hardness scales that shall be used with steals of the specified thicknesses. Tables XIV and XV establish the corrections to be added to compensate for the effect of surface curvature. Table XVI establishes the Rockwell hardness requirements for wrought 300 series stainless steel. Hardness requirements for low alloy steels, precipitation hardening steels and 400 series stainless steels are listed in the applicable specifications and engineering drawings. Table XVII establishes the approximate Rockwell hardness to strength relationship for low alloy steels. Table XVIII establishes the approximate Rockwell conversion values between scales. Table XIX establishes the Frequency of Hardness testing. 3. Magnesium Alloy Table XX establishes the Rockwell Hardness requirements for magnesium alloy castings. 4. Copper Alloys Table XXI establishes the Rockwell Hardness requirements for copper alloys. (516) 575-3767 Page 10 of 40
XI. TABLES: (continued) 5. How to use Conductivity Correction Tables. A. Example 1: Find the conductivity values for 2024-T6 aluminum 0.032 thick. 1. Reference Table VII (Electrical Conductivity Requirements for Wrought Aluminum Alloys (Bare).063 Inches and Greater in Thickness). In the Alloy & Temper column locate 2024-T6. In the Range (% IACS) column, the uncorrected result is 35.0 39.0. 2. Reference Table VIII (Electrical Conductivity for Bare Thin Gauge Aluminum). Select the smaller number from the uncorrected result in step 1, 35.0 (%IACS). 3. Under the Uncorrected Conductivity Values in % IACS column locate 35.0. Follow this row to the right until you are under the 0.032 inch thickness column. 4. The corrected conductivity value is 38.0. 5. Select the larger uncorrected result from step # 1 (39.0). Reference Table VIII, look under the Uncorrected Conductivity Values in % IACS and locate 39.0. 6. Follow this row to the right until you are under the 0.032 inch thickness column. 7. The corrected conductivity value is 42.0. 8. The Corrected Conductivity for 0.032 inch thick 2024-T6 Aluminum is 38.0 42.0 % IACS. These are the values that must be obtained directly from the conductivity meter for material to be considered acceptable. (516) 575-3767 Page 11 of 40
XI. TABLES: (continued) B. Example 2: Find the conductivity values for 7075-T6 Clad Aluminum 0.040 inch thick. 1. Reference Table VII (Electrical Conductivity Requirements for Wrought Aluminum Alloys (Bare).063 Inches and Greater in Thickness). In the Alloy & Temper column locate 7075-T6. In the Range (% IACS) column, the uncorrected result is 29.5 34.5. 2. Reference Table IX (Electrical Conductivity for 2024, 7075, 7079, & 7178 Clad Aluminum Alloys). Select the smaller number from the uncorrected result in step 1, 29.5 (% IACS). 3. Under the Uncorrected Conductivity Values In % IACS column locate 29.5. Since this column lists values for 29 and 30, you must interpolate to determine the corrected value for 29.5. Follow rows 29 and 30 to the right until you are under the 0.040 thickness column. The corrected values of 32.5 and 33.0 should be attained. 4. The corrected conductivity interpolated value result is 32.7. 5. Select the larger uncorrected result obtained from Step 1, 34.5. Reference Table IX, look under the Uncorrected Conductivity Values in % IACS column and locate the 34.5 value. Since the column lists values for 34 and 35, you must interpolate to determine the corrected value for 34.5. Follow rows 34 and 35 to the right until you are under the 0.040 thickness column. The corrected values of 37.0 and 38.0 should be attained. 6. The corrected conductivity interpolated value result is 37.5. 7. The Corrected Conductivity for 0.040 inch thick 7075-T6 Clad Aluminum is 32.7 37.5 % IACS. These are the values that must be obtained directly from the conductivity meter for material to be considered acceptable. (516) 575-3767 Page 12 of 40
Hardness Thickness Chart Aluminum Alloys B Scale Min Thickness (inch) E&F Scale Min Thickness (inch) H Scale Min Thickness (inch) 45 T Scale Min Thickness (inch) 30 T Scale Min Thickness (inch) 15 T Scale Min Thickness (inch) 110.020 99.5.032 109.022 71.016 81.7.013 92.7.009 98.4.033 108.024 66.5.017 81.2.014 92.3.009 96.035 107.026 62.018 80.014 91.9.010 94.1.036 105.028 57.5.019 78.3.014 91.7.010 92.038 103.030 53.020 77.5.015 90.5.010 85.040 100.032 48.021 75.5.015 89.5.011 85.5.043 98.035 43.022 73.7.016 88.2.011 82.5.046 95.037 37.023 72.7.016 87.2.011 79.049 90.040 116.016 31.024 69.5.017 86.2.012 75.053 85.043 114.018 24.5.025 67.017 85.012 70.056 80.048 110.020 18.026 63.5.018 83.5.013 65.060 70.056 109.022 11.027 60.019 81.7.013 58.065 60.066 108.025 4.028 55.020 79.5.014 49.070 50.074 106.028 49.021 76.5.015 39.078 40.082 102.032 42.022 73.2.016 NOTE: The thickness column to the right of each scale column indicates the recommended minimum thickness that should be Rockwell Hardness tested using that load and penetrator combination. Table I (516) 575-3767 Page 13 of 40
Hardness Corrections to be added to B, E, and F Scale Readings to Compensate for the Effect of Surface Curvature for Aluminum Alloys Scale Reading Diameter of Curvature - Inches ¼ 3/8 ½ 5/8 ¾ 7/8 1 0 12.5 8.5 6.5 5.5 4.5 3.5 3.0 5 12.5 8.0 6.5 5.5 4.5 3.5 3.0 10 12.0 8.0 6.0 5.0 4.0 3.5 3.0 15 11.5 7.5 5.5 5.0 4.0 3.5 3.0 20 11.0 7.5 5.5 4.5 4.0 3.5 3.0 25 10.5 7.0 5.0 4.5 3.5 3.0 3.0 30 10.0 6.5 5.0 4.5 3.5 3.0 2.5 35 9.5 6.0 4.5 4.0 3.0 2.5 2.5 40 9.0 6.0 4.5 4.0 3.0 2.5 2.5 45 8.5 5.5 4.0 3.5 3.0 2.5 2.5 50 8.0 5.5 4.0 3.5 3.0 2.5 2.0 55 7.5 5.0 3.5 3.0 2.5 2.0 2.0 60 7.0 5.0 3.5 3.0 2.5 2.0 2.0 65 6.5 4.5 3.0 2.5 2.5 2.0 2.0 70 6.0 4.0 3.0 2.5 2.0 2.0 1.5 75 5.5 3.5 2.5 2.0 2.0 1.5 1.5 80 5.0 3.5 2.5 2.0 1.5 1.5 1.5 85 4.5 3.0 2.0 1.5 1.5 1.5 1.5 90 4.0 3.0 2.0 1.5 1.5 1.5 1.0 95 3.5 2.5 1.5 1.5 1.0 1.0 1.0 100 3.5 2.5 1.5 1.5 1.0 1.0 0.5 Table II (516) 575-3767 Page 14 of 40
Hardness Corrections to be Added to 15T, 30T and 45T Scale Readings to Compensate for the Effect of Surface Curvature for Aluminum Alloys Scale Reading Diameter of Curvature - Inches 1/8 1/4 3/8 1/2 5/8 3/4 1 0 5 10 15 20 13.0 9.0 6.0 4.5 3.5 3.0 2.0 25 12.5 8.5 5.5 4.5 3.5 3.0 2.0 30 11.5 7.5 5.0 4.0 3.5 2.5 2.0 35 11.0 7.0 5.0 4.0 3.5 2.5 2.0 40 10.0 6.5 4.5 3.5 3.0 2.5 2.0 45 9.5 6.0 4.5 3.5 3.0 2.5 2.0 50 8.5 5.5 4.0 3.0 2.5 2.0 1.5 55 7.5 5.0 3.5 3.0 2.5 2.0 1.5 60 6.5 4.5 3.0 2.5 2.0 1.5 1.5 65 6.0 4.0 3.0 2.5 2.0 1.5 1.5 70 5.0 3.5 2.5 2.0 1.5 1.0 1.0 75 4.0 3.0 2.0 2.0 1.5 1.0 1.0 80 3.0 2.0 1.5 1.5 1.0 1.0 0.5 85 2.5 1.5 1.5 1.0 0.5 0.5 0.5 90 1.5 1.0 1.0 0.5 0.5 0.5 0.5 95 1.5 1.0 0.5 0.5 0.5 0 0 100 1.0 0.5 0 0 0 0 0 Table III (516) 575-3767 Page 15 of 40
Hardness and Electrical Conductivity Requirements for Aluminum Alloy Plate Electrical Conductivity % IACS Alloy & Temper Minimum Upper Maximum RB Hardness (Minimum) 2014-T451 31.0 34.5 65 2014-T651 35.5 40.0 41.5 78 2X24-T351 28.0 32.5 69 2X24-T851 37.5 41.0 42.5 74 2219-T851 31.0 35.0 71 2219-T87 31.0 35.0 77 6061-T451 35.5 41.0 43.0 24 6061-T651 40.0 46.0 50.0 47 7050-W51 25.5 29.0 80 7050-T7451 38.0 43.0 82 7050-T7651 39.0 43.0 82 7150-T651 34.0 36.5 86 7075-W51 27.0 30.5 7075-T651 30.0 33.5 34.5 85 7075-T7351 38.0 41.0 42.0 78 7075-T7651 36.0 40.0 41.0 82 7178-T651 29.0 33.0 87 7178-T7651 36.0 40.0 42.0 84 7475-T7351 40.0 44.5 78 NOTES: 1. Aluminum, alloy plate shall be 100% electrical conductivity tested. From each lot, perform hardness testing on the two plates having the highest and lowest electrical conductivity values. 2. When the electrical conductivity test value of a plate exceeds the upper value, but is equal to or less than the maximum value, the plate must be hardness tested for disposition. 3. All plates tested must be within the minimum-maximum electrical conductivity range for acceptance. Table IV (516) 575-3767 Page 16 of 40
Hardness Requirements for Wrought Aluminum Alloys Excluding Plate Alloy & Temper Rockwell Hardness Scale B E H 15T 30T 1100-0 50 MAX 1100-H12 46 MIN 1100-H14 65 MIN 1100-H16 67 MIN 1100-H18 74 MIN 3003-0 65 MAX 3003-H12 68 MIN 3003-H14 80-90 3003-H16 88-95 62-68 3003-H18 66-75 66-73 2014-0 70 MAX 95 MAX 2014-T3XX 65-70 95-100 79-86 2014-T4XX 65-70 95-100 79-86 2014-T6XX 78-86 102-106 86-90 2014-T6XX ALCLAD 76-90 101-106 85-90 2024/2124-0 70 MAX 95 MAX 2024/2124-T3XXX 64-83 97-106 82-87 62-72 2024/2124-T4XXX 64-83 97-106 82-87 62-72 2024/2124-T6XXX 72-84 100-106 84-88 65-72 2024/2124-T8XXX 74-87 100-108 85-91 67-75 2024/2124-T81 74-87 100-108 85-91 67-75 2024/2124-T84 81-90 104-110 86-91 71-75 2024/2124-T86 83-90 105-110 87-91 72-75 2024/2124-T3XXX ALCLAD 0.040-0.079 inch in thickness 2024/2124-T3XXX ALCLAD 0.080-0.125 inch in thickness 2024/2124-T3XXX ALCLAD over 0.125 inch in thickness 2024/2124-T4XXX ALCLAD 0.020 0.039 inch in thickness 2024/2124-T4XXX ALCLAD 0.040-0.079 inch in thickness 2024/2124-T4XXX ALCLAD 0.080-0.125 inch in thickness 2024/2124-T4XXX ALCLAD over 0.125 inch in thickness 2024-2124-T6XXX ALCLAD 0.020-0.039 inch in thickness 2024/2124-T6XXX ALCLAD 0.040-0.079 inch in thickness 2024/2124-T6XXX ALCLAD 0.080-0.125 inch in thickness 2024/2124-T6XXX ALCLAD over 0.125 inch in thickness 58-83.5 55-83.5 52-71 93-102 57-83.5 54-83.5 52-71 93-102 70-86 64-86 62-77 Table V 79-85 82-88 (516) 575-3767 Page 17 of 40
Hardness Requirements for Wrought Aluminum Alloys Excluding Plate (continued) Alloy & Temper Rockwell Hardness Scale B E H 15T 30T 2024/2124-T8XXX ALCLAD 0.040-0.079 inch in thickness 2024/2124-T8XXX ALCLAD 0.080-0.125 inch in thickness 71-86 68-86 2219-0 2219-T3XXX 60-75 73 MAX 34 MAX 54-67 2219-T6XXX 62-80 94-105 81-86 59-71 2219-T8XXX 71-86 97-107 63-74 2219-T42 85 MIN 76 MIN 2224-T3XXX 71-83 97-104 2324-T39 77-86 100-106 5052-0 65 MAX 92 MAX 66 MAX 5052-H32 61-81 63-74 5052-H34 67-84 65-75 5052-H36 73-87 70-77 5052-H38 80-90 75-79 6061-0 75 MAX 6061-T4XXX 68-82 65-75 6061-T6XXX 85-97 78-82 6063-T5XXX 50-87 85-107 63-79 6063-T6XXX 70-87 95-107 68-79 7049-T73XXX 82-93 104-110 71-75 7050-T73XXX/T74XXX 82-93 104-109 71-75 7050T76XXX 82-93 104-109 71-75 7150-T6XXX 86-94 106-112 87-92 7075/7175-0 100 MAX 18 MAX 7075/7175-T6XXX 86-94 106-112 87-92 7075/7175-T73XXX 79-89 100-108 85-91 69-75 7075/7175-T736X/T74XXX 82-94 103-110 7075/7175-T76XXX 82-94 103-110 86-92 7075/7175-T6XXX ALCLAD 0.020-0.039 7075/7175-T6XXX ALCLAD 0.040-0.079 inch in thickness 7075/7175-T6XXX ALCLAD 0.080-0.125 inch in thickness 7075/7175-T6XXX ALCLAD OVER 0.125 inch in thickness 86-90 79-94 85-90 75-94 76-92 Table V (516) 575-3767 Page 18 of 40
Hardness Requirements for Wrought Aluminum Alloys Excluding Plate (continued) Alloy & Temper Rockwell Hardness Scale B E H 15T 30T 7075/7175-T73XXX ALCLAD 77-89 0.040-0.079 inch in thickness 7075/7175/T73XXX ALCLAD 74-89 0.080-0.125 inch in thickness 7075-T73XX Hand Forgings 79-89 less than 2 inch thick 7075-T73XX Hand Forgings 77-89 2.000-3.000 inch thick 7075-T73XX Hand Forging 75-89 3.001-4.000 inch thick 7075-T 73XX Hand Forgings 74-89 greater than 4 inch thick 7075-T76XXX 84-92 0.020-0.039 inch thick 7075-T76XXX 75-94 84-92 0.040-0.079 inch thick 7075-T76XXX 74-94 84-92 0.080-0.125 inch thick 7079-T6XXX 81-93 104-112 87-92 7178-T6XXX 89-94 108-112 88-94 7178-T76XXX 84-93 104-109 85-92 Table V (516) 575-3767 Page 19 of 40
Hardness Requirements for Aluminum Alloy Castings Alloy & Temper Casting Type Rockwell Hardness (Minimum) E Scale 43F Sand 30 43F Permanent Mold 33 195-T4 Sand 73 195-T4 Permanent Mold 77 195-T6 Sand 77 195-T6 Permanent Mold 88 220-T4 Sand 77 355-T6 Sand 80 355-T6 Permanent Mold 88 356-T6 QQ-A-601 68 A356-T6 Class 10 (MIL-A-21180) 80 A356-T6 Class 11 78 A356-T6 Class 12 72 142-T571 Sand 85 142-T77 Sand 78 142-T571 Permanent Mold 95 142-T61 Permanent Mold 97 122-T61 Sand 100 108F Sand 56 113F Sand 73 40E-T5 Sand 77 A380 Die Casting 82 380 Die Casting 81 218 Die Casting 80 85 Die Casting 78 85X Die Casting 75 A360 Die Casting 78 360 Die Casting 78 NOTE: For Alloys and tempers not listed, contact the Northrop Grumman Technical Services Laboratory for assistance. Table VI (516) 575-3767 Page 20 of 40
Electrical Conductivity Requirements for Wrought Aluminum Alloys (Bare).063 Inches and Greater in Thickness (Excluding Plate) Alloy & Temper (516) 575-3767 Page 21 of 40 Range (%IACS) 1100-All 57.0-61.5 2014-0 48.5-51.0 2014-T3XX 31.5-34.5 2014-T4XX 31.5-34.5 2014-T6XX 35.0-40.0 2017-0 48.5-51.0 2017-T4XXX 31.5-35.0 2024/2124-0 46.0-49.0 2024/2124-T3XXX 28.5-33.0 2024/2124-T4XXX 28.0-32.0 2024/2124-T6XXX 35.0-39.0 2024/2124-T8XXX 35.0-42.0 2219-0 44.0-51.0 2219-T3XXX 26.0-31.0 2219-T6XXX 31.0-35.0 2219-T8XXX 31.0-35.0 2219-T42 28.0-32.0 2224-T3XXX 29.0-32.0 2324-T39 29.0-32.0 3003-0 44.5-50.0 3003-H12,H14,H16,H18 37.5-51.1 5052-ALL 33.5-37.5 6061-0 47.0-51.0 6061-T4XXX 38.0-44.0 6061-T6XXX 42.0-51.0 6063-T5XXX 50.0-60.0 6063-T6XXX 50.0-60.0 7049-0 44.0-50.0 7049-T73XXX 38.0 MINIMUM 7049-T76XXX 38.0-44.0 7050-T73651/T7451 40.0-44.0 7050-T73652/T7452 40.0-44.0 7050-T76XXX 39.0-44.0 7075/7175-0 44.5-47.8 7075/7175-WXXX 28.5-30.5 7075/7175-T6XXX 29.5-34.5 7075/7175-T7XXX 38.0-42.0 7079-T6XXX 30.0-35.0 7150-T651 34.0 MINIMUM 7150-T651X 32.0 MINIMUM 7178-T6XXX 29.5-33.0 7178-T76XXX 36.5-40.0 Table VII Note: Conductivity of 7050-T76511 aluminum alloy per AMS 4340. Conductivity of this material is acceptable below the required minimum of 39.0 if the requirements of section 3.3.2.2 of AMS-4340 are satisfactory.
Electrical Conductivity for Bare Thin Gauge Aluminum Special Conditions Procedure #1 (Hocking Autosigma 2000) 1. Find the minimum material acceptance limit values (uncorrected) in the left hand column of table VIII. Read across the columns until you are at the applicable part/material thickness. Note this value as the corrected minimum acceptance limit. 2. Repeat the above procedure to obtain the corrected maximum acceptance limit, except use the maximum material acceptance limit value (uncorrected) 3. For material acceptance limit values (uncorrected) that have a fraction of a percent IACS, the corrected values can be obtained by interpolation. Use the corrected table values on both sides of the fractional, uncorrected part/material value being evaluated and an appropriate rounding technique. 4. The measured conductivity values obtained from the inspection part/material shall be between the corrected acceptance limits to be acceptable. Uncorrected Conductivity Values in % IACS Single Thickness (Gauge), Inches 0.016 0.020 0.025 0.032 0.040 0.050 0.063 & above Corrected Conductivity Values On Percent IACS 26.0 12.5 19.0 23.5 27.5 28.0 26.5 26.0 27.0 14.0 20.0 25.0 29.0 29.0 27.5 27.0 28.0 15.0 21.5 26.5 30.0 30.0 28.5 28.0 29.0 16.0 22.5 28.0 31.0 31.0 29.5 29.0 30.0 17.5 24.0 29.5 32.5 32.0 30.5 30.0 31.0 18.5 25.0 31.0 33.5 33.0 31.5 31.0 32.0 19.5 26.5 32.0 34.5 34.0 32.5 32.0 33.0 21.0 28.0 33.5 35.5 35.0 33.5 33.0 34.0 22.0 29.0 35.0 36.5 35.5 34.5 34.0 35.0 23.0 30.5 36.5 38.0 36.5 35.5 35.0 36.0 24.5 31.5 37.5 39.0 37.5 36.5 36.0 37.0 25.5 33.0 39.0 40.0 38.5 37.0 37.0 38.0 26.5 34.0 40.5 41.0 39.5 38.0 38.0 39.0 28.0 35.5 41.5 42.0 40.5 39.0 39.0 40.0 29.0 36.5 43.0 43.5 41.5 40.0 40.0 41.0 30.0 38.0 44.5 44.5 42.5 41.0 41.0 42.0 31.5 39.0 45.5 45.5 43.5 42.0 42.0 43.0 32.5 40.5 47.0 46.5 44.0 43.0 43.0 Table VIII (continued on next page) (516) 575-3767 Page 22 of 40
Uncorrected Conductivity Values In % IACS Electrical Conductivity for Bare Thin Gauge Aluminum (continued from previous page) Single Thickness (Gauge), Inches 0.016 0.020 0.025 0.032 0.040 0.050 0.063 & above Corrected Conductivity Values On Percent IACS 44.0 34.0 41.5 48.0 47.5 45.0 44.0 44.0 45.0 35.0 43.0 49.5 48.5 46.0 45.0 45.0 46.0 36.0 44.0 50.5 49.5 47.0 46.0 46.0 47.0 37.5 45.5 52.0 51.0 48.0 47.0 47.0 48.0 38.5 46.5 53.0 52.0 49.0 48.0 48.0 49.0 40.0 48.0 54.5 53.0 50.0 49.0 49.0 50.0 41.0 49.0 55.5 54.0 51.0 50.0 50.0 51.0 42.5 50.0 57.0 55.0 52.0 51.0 51.0 52.0 43.5 51.5 58.0 56.0 53.0 52.0 52.0 53.0 45.0 52.5 59.0 57.0 54.0 53.0 53.0 54.0 46.0 54.0 60.5 58.0 55.0 53.5 54.0 55.0 47.0 55.0 61.5 59.0 55.5 54.5 55.0 56.0 48.5 56.5 62.5 60.0 56.5 55.5 56.0 57.0 49.5 57.5 63.5 61.0 57.5 56.5 57.0 58.0 51.0 58.5 65.0 62.0 58.5 57.5 58.0 59.0 52.0 60.0 66.0 63.0 59.5 58.5 59.0 60.0 53.5 61.0 67.0 64.0 60.5 59.5 60.0 61.0 54.5 62.5 68.0 65.0 61.5 60.5 61.0 62.0 56.0 63.5 69.0 66.0 62.5 61.5 62.0 63.0 57.0 64.5 70.5 67.0 63.5 62.5 63.0 64.0 58.5 66.0 71.5 68.0 64.5 63.5 64.0 65.0 60.0 67.0 72.5 69.0 65.5 64.5 65.0 NOTES: 1. Follow the inspection thickness limitations for your conductivity test instrument. If you do not know your test instrument thickness limitation, conductivity readings for material under 0.063 inch in thickness shall not be used to accept/reject parts/materials unless Northrop Grumman Technical Services Laboratory approved correction factors are supplied. Table VIII (516) 575-3767 Page 23 of 40
Electrical Conductivity for 2024, 7075, 7079, & 7178 Clad Aluminum Alloys (Hocking Autosigma 2000) Uncorrected Single Thickness (Gauge), Inches Conductivity.016.020.025.032.040.050.063.080.090.100.110.125.140.160 Values In % IACS Corrected Conductivity Values in Percent IACS 26 14.5 20.5 26.5 29.5 29.5 29.0 27.5 28.5 28.5 29.0 29.5 30.0 30.5 31.5 27 16.0 21.5 28.0 30.5 30.5 30.0 28.5 29.0 29.5 30.0 30.5 31.0 31.5 32.5 28 17.0 23.0 29.0 32.0 31.5 30.5 29.0 30.0 30.5 31.0 31.5 32.0 32.5 33.0 29 18.0 24.0 30.5 33.0 32.5 31.5 30.0 31.0 31.5 32.0 32.0 32.5 33.0 34.0 30 19.0 25.5 31.5 34.0 33.0 32.5 31.0 32.0 32.5 32.5 33.0 33.5 34.0 34.5 31 20.5 27.0 33.0 35.0 34.0 33.5 32.0 33.0 33.0 33.5 34.0 34.5 35.0 35.5 32 21.5 28.0 34.0 36.0 35.0 34.5 33.0 34.0 34.0 34.5 34.5 35.0 35.5 36.5 33 22.5 29.5 35.5 37.0 36.0 35.0 34.0 34.5 35.0 35.5 35.5 36.0 36.5 37.0 34 23.5 30.5 36.5 38.0 37.0 36.0 35.0 35.5 36.0 36.0 36.5 37.0 37.5 38.0 35 25.0 31.5 38.0 39.0 38.0 37.0 36.0 36.5 37.0 37.0 37.5 37.5 38.0 38.5 36 26.0 33.0 39.0 40.0 38.5 38.0 36.5 37.5 37.5 38.0 38.0 38.5 39.0 39.5 37 27.0 34.0 40.0 41.5 39.5 39.0 37.5 38.5 38.5 39.0 39.0 39.5 40.0 40.0 38 28.5 35.5 41.5 42.5 40.5 39.5 38.5 39.5 39.5 39.5 40.0 40.5 40.5 41.0 39 29.5 36.5 42.5 43.5 41.5 40.5 39.5 40.0 40.5 40.5 41.0 41.0 41.5 42.0 40 30.5 38.0 44.0 44.5 42.5 41.5 40.5 41.0 41.5 41.5 41.5 42.0 42.0 42.5 41 31.5 39.0 45.0 45.5 43.5 42.5 41.5 42.0 42.0 42.5 42.5 43.0 43.0 43.5 42 33.0 40.5 46.0 46.5 44.0 43.5 42.5 43.0 43.0 43.0 43.5 43.5 44.0 44.0 43 34.0 41.5 47.5 47.5 45.0 44.0 43.5 44.0 44.0 44.0 44.0 44.5 44.5 45.0 44 35.0 43.0 48.5 48.5 46.0 45.0 44.0 44.5 45.0 45.0 45.0 45.5 45.5 46.0 45 36.5 44.0 49.5 49.5 47.0 46.0 45.0 45.5 46.0 46.0 46.0 46.0 46.5 46.5 46 37.5 45.0 50.5 50.5 48.0 47.0 46.0 46.5 46.5 46.5 47.0 47.0 47.0 47.5 47 39.0 46.5 52.0 51.5 48.5 48.0 47.0 47.5 47.5 47.5 47.5 48.0 48.0 48.0 48 40.0 47.5 53.0 52.5 49.5 48.5 48.0 48.5 48.5 48.5 48.5 48.5 49.0 49.0 49 41.0 49.0 54.0 53.5 50.5 49.5 49.0 49.5 49.5 49.5 49.5 49.5 49.5 49.5 50 42.5 50.0 55.0 54.5 51.5 50.5 50.0 50.0 50.0 50.5 50.5 50.5 50.5 50.5 Table IX (516) 575-3767 Page 24 of 40
Electrical Conductivity for 2014, 2219 Clad Aluminum Alloys (Hocking Autosigma 2000) Uncorrected Single Thickness (Gauge), Inches Conductivity.016.020.025.032.040.050.063.080.090.100.110.125.140.160 Values In % IACS Corrected Conductivity Values in Percent IACS 26 19.0 25.0 28.5 30.5 29.5 29.0 29.5 31.5 32.5 29.0 29.5 30.0 30.5 31.5 27 20.0 26.0 30.0 31.5 30.5 30.0 30.5 32.5 33.0 30.0 30.5 31.0 31.5 32.5 28 21.0 27.5 31.0 33.0 31.5 30.5 31.5 33.0 34.0 31.0 31.5 32.0 32.5 33.0 29 22.0 28.5 32.5 34.0 32.5 31.5 32.0 34.0 34.5 32.0 32.0 32.5 33.0 34.0 30 23.0 30.0 33.5 35.0 33.0 32.5 33.0 34.5 35.5 32.5 33.0 33.5 34.0 34.5 31 24.0 31.0 34.5 36.0 34.0 33.5 34.0 35.5 36.0 33.5 34.0 34.5 35.0 35.5 32 25.0 32.0 36.0 37.0 35.0 34.5 35.0 36.5 37.0 34.5 34.5 35.0 35.5 36.5 33 25.5 33.5 37.0 38.0 36.0 35.0 36.0 37.0 37.5 35.5 35.5 36.0 36.5 37.0 34 26.5 34.5 38.0 39.0 37.0 36.0 36.5 38.0 38.5 36.0 36.5 37.0 37.5 38.0 35 27.5 36.0 39.5 40.0 38.0 37.0 37.5 38.5 39.0 37.0 37.5 37.5 38.0 38.5 36 28.5 37.0 40.5 41.0 38.5 38.0 38.5 39.5 40.0 38.0 38.0 38.5 39.0 39.5 37 29.5 38.0 41.5 42.0 39.5 39.0 39.5 40.0 40.5 39.0 39.0 39.5 40.0 40.0 38 30.5 39.5 42.5 43.0 40.5 39.5 40.5 41.0 41.5 39.5 40.0 40.5 40.5 41.0 39 32.0 40.5 44.0 44.0 41.5 40.5 41.0 42.0 42.0 40.5 41.0 41.0 41.5 42.0 40 33.0 41.5 45.0 45.0 42.5 41.5 42.0 42.5 43.0 41.5 41.5 42.0 42.0 42.5 41 34.0 42.5 46.0 46.0 43.5 42.5 43.0 43.5 43.5 42.5 42.5 43.0 43.0 43.5 42 35.0 44.0 47.0 47.0 44.0 43.5 44.0 44.0 44.5 43.0 43.5 43.5 44.0 44.0 43 36.0 45.0 48.5 48.0 45.0 44.0 45.0 45.0 45.5 44.0 44.0 44.5 44.5 45.0 44 37.0 46.0 49.5 49.0 46.0 45.0 45.5 46.0 46.0 45.0 45.0 45.5 45.5 46.0 45 38.0 47.5 50.5 50.0 47.0 46.0 46.5 46.5 47.0 46.0 46.0 46.0 46.5 46.5 46 39.0 48.5 51.5 50.5 48.0 47.0 47.5 47.5 47.5 46.5 47.0 47.0 47.0 47.5 47 40.0 49.5 52.5 51.5 48.5 48.0 48.5 48.0 48.5 47.5 47.5 48.0 48.0 48.0 48 41.0 50.5 53.5 52.5 49.5 48.5 49.0 49.0 49.0 48.5 48.5 48.5 49.0 49.0 49 42.5 52.0 54.5 53.5 50.5 49.5 50.0 49.5 50.0 49.5 49.5 49.5 49.5 49.5 50 43.5 53.0 56.0 54.5 51.5 50.5 51.0 50.5 50.5 50.5 50.5 50.5 50.5 50.5 51 44.5 54.0 57.0 55.5 52.5 51.5 52.0 51.5 51.5 51.0 51.0 51.0 51.0 51.5 Table X (516) 575-3767 Page 25 of 40
Electrical Conductivity for 3003 and 6061 Clad Aluminum Alloys (Table XI) (Hocking Autosigma 2000) Special Conditions Procedure #2 (Hocking Autosigma 2000) 1. Find the minimum material acceptance limit value (uncorrected) in the left hand column of the table. Read across the columns until you are at the part/material thickness. Note this value as the corrected minimum acceptance limit. 2. Find the maximum material acceptance limit value (uncorrected) in the left hand column of the table. Read across the columns until you are at the part/material thickness. Note this value as the corrected maximum acceptance limit. 3. For material acceptance limit values (uncorrected) that have a fraction of a percent IACS, the corrected values can be obtained by interpolation. Use the corrected table values on both sides of the fractional, uncorrected part/material value being evaluated and an appropriate rounding technique. 4. The measured conductivity values obtained from the inspection part/material shall be between the corrected acceptance limits to be acceptable. Notes: Conductivity readings on clad material shall not be used to accept/reject parts unless: 1. The following clad correction factors as determined on the Hocking Autosigma 2000 are applied. 2. Clad has been removed from the inspection area and subsequent conductivity testing is performed on bare material. a. Clad removal and restoration shall be coordinated with the applicable Northrop Grumman Engineering Section. (516) 575-3767 Page 26 of 40
Electrical Conductivity for 3003 and 6061 Clad Aluminum Alloys (Hocking Autosigma 2000) Uncorrected Single Thickness (Gauge), Inches Conductivity.016.020.025.032.040.050.063.080.090.100.110.125.140.160 Values In % IACS Corrected Conductivity Values in Percent IACS 36 26.0 33.0 39.0 40.0 38.5 38.0 38.5 39.5 40.0 40.5 41.0 41.5 42.5 43.5 37 27.0 34.0 40.0 41.5 39.5 39.0 39.5 40.0 40.5 41.0 41.5 42.5 43.0 44.0 38 28.5 33.5 41.5 42.5 40.5 39.5 40.5 41.0 41.5 42.0 42.5 43.0 43.5 44.5 39 29.5 36.5 42.5 43.5 41.5 40.5 41.0 42.0 42.0 42.5 43.0 43.5 44.5 45.0 40 30.5 38.0 44.0 44.5 42.5 41.5 42.0 42.5 43.0 43.5 44.0 44.5 45.0 45.5 41 31.5 39.0 45.0 45.5 43.5 42.5 43.0 43.5 43.5 44.0 44.5 45.0 45.5 46.0 42 33.0 40.5 46.0 46.5 44.0 43.5 44.0 44.0 44.5 45.0 45.0 45.5 46.0 46.5 43 34.0 41.5 47.5 47.5 45.0 44.0 45.0 45.0 45.5 45.5 46.0 46.5 46.5 47.5 44 35.0 43.0 48.5 48.5 46.0 45.0 45.5 46.0 46.0 46.5 46.5 47.0 47.5 48.0 45 36.5 44.0 49.5 49.5 47.0 46.0 46.5 46.5 47.0 47.0 47.0 47.5 48.0 48.5 46 37.5 45.0 50.5 50.5 48.0 47.0 47.5 47.5 47.5 47.5 48.0 48.0 48.5 49.0 47 39.0 46.5 52.0 51.5 48.5 48.0 48.5 48.0 48.5 48.5 48.5 49.0 49.0 49.5 48 40.0 47.5 53.0 52.5 49.5 48.5 49.0 49.0 49.0 49.0 49.5 49.5 49.5 50.0 49 41.0 49.0 54.0 53.5 50.5 49.5 50.0 49.5 50.0 50.0 50.0 50.0 50.5 50.5 50 42.5 50.0 55.0 54.5 51.5 50.5 51.0 50.5 50.5 50.5 50.5 51.0 51.0 51.0 51 43.5 51.0 56.5 55.0 52.5 51.5 52.0 51.5 51.5 51.5 51.5 51.5 51.5 51.5 52 45.0 52.5 57.5 56.0 53.0 52.0 52.5 52.0 52.0 52.0 52.0 52.0 52.0 52.0 53 46.0 53.5 58.5 57.0 54.0 53.0 53.5 53.0 53.0 53.0 53.0 53.0 53.0 53.0 54 47.0 55.0 59.5 58.0 55.0 54.0 54.5 53.5 53.5 53.5 53.5 53.5 53.5 53.5 55 48.5 56.0 60.5 59.0 56.0 55.0 55.5 54.5 54.5 54.5 54.0 54.0 54.0 54.0 56 49.5 57.0 61.5 60.0 57.0 55.5 56.0 55.0 55.0 55.0 55.0 54.5 54.5 54.5 Table XI (516) 575-3767 Page 27 of 40
Electrical Conductivity Correction Factors for Curved Surfaces (Table XII) Special Conditions Procedure #3 Hocking Autosigma 2000 a. Use a probe fixture that is made for curved surfaces. b. If a probe fixture is not available, use the following technique for measuring the conductivity: 1. Place the probe on the part surface. 2. Slowly rock the probe back and forth and watch for the maximum reading. 3. Record the maximum reading. c. For part/material thickness equal to or greater than 0.063 inch, do the following: 1. Find the minimum material acceptance limit value (uncorrected) in the left hand column of Table XII. Read across the columns until you are at the curvature diameter. Note this value as the corrected minimum acceptance limit. 2. Find the maximum material acceptance limit value (uncorrected) in the left hand column of Table of Table XII. Read across the columns until you are at the curvature diameter. Note this value as the corrected maximum acceptance limit. 3. For material acceptance limit values (uncorrected) that have a fraction of a percent IACS, the correction values can be obtained by interpolation. Use the corrected table values on both sides of the fractional, uncorrected curvature diameter value being evaluated and an appropriate rounding technique. d. For part/material thickness less than 0.063 inch, do the following: 1. Go to Table VIII and obtain the minimum and maximum acceptance limit values for thin gauge material by following special conditions procedure #1. The resultant corrected values from the thin gauge table become the uncorrected values for the surface curvature Table XII. (516) 575-3767 Page 28 of 40
Electrical Conductivity Correction Factors for Curved Surfaces (Table XII continued) 2. Find the minimum material acceptance limit value (uncorrected) in the left hand column of Table XII. Read across the columns until you are at the curvature diameter. Note this value as the corrected minimum acceptance limit. 3. Find the maximum material acceptance limit value (uncorrected) in the left hand column of Table XII. Read across the columns until you are at the curvature diameter. Note this value as the corrected maximum acceptance limit. 4. For material acceptance limit values (uncorrected) that have a fraction of a percent IACS, the correction values can be obtained by interpolation. Use the corrected table values on both sides of the fractional, uncorrected curvature diameter value being evaluated and an appropriate rounding technique. e. The measured conductivity values obtained from the inspection part/material shall be between the corrected acceptance limits to be acceptable. NOTES: 1. For test instruments other than Hocking Autosigma 2000, conductivity readings on parts/materials with a convex surface curvature of less than 6 inches in diameter or a concave surface curvature of less than 20 inches in diameter shall not be used to accept/reject unless the applicable curvature correction factors are available for the specific conductivity test instrument and have been approved by the Technical Services Laboratory. (516) 575-3767 Page 29 of 40
Uncorrected Conductivity Values In IACS Electrical Conductivity Correction Factors for Curved Surfaces Diameter, Inches 0.250 0.375 0.500 0.750 1.000 1.500 2.000 3.000 3.500 4.000 5.000 20 12.0 15.5 17.5 19.0 19.5 20.0 20.0 20.0 20.0 20.0 20.0 21 12.5 16.5 18.0 20.0 20.5 21.0 21.0 21.0 21.0 21.0 21.0 22 13.5 17.0 19.0 20.5 21.5 22.0 22.0 22.0 22.0 22.0 22.0 23 14.0 18.0 20.0 21.5 22.5 23.0 23.0 23.0 23.0 23.0 23.0 24 14.5 18.5 21.0 22.5 23.0 23.5 24.0 24.0 24.0 24.0 24.0 25 15.5 19.5 21.5 23.5 24.0 24.5 25.0 25.0 25.0 25.0 25.0 26 16.0 20.5 22.5 24.5 25.0 25.5 26.0 26.0 26.0 26.0 26.0 27 16.5 21.0 23.5 25.5 26.0 26.5 27.0 27.0 27.0 27.0 27.0 28 17.0 22.0 24.0 26.0 27.0 27.5 28.0 28.0 28.0 28.0 28.0 29 18.0 22.5 25.0 27.0 28.0 28.5 28.5 29.0 29.0 29.0 29.0 30 18.5 23.5 26.0 28.0 29.0 29.5 29.5 30.0 30.0 30.0 30.0 31 19.0 24.5 27.0 29.0 30.0 30.5 30.5 31.0 31.0 31.0 31.0 32 20.0 25.0 27.5 30.0 31.0 31.5 31.5 32.0 32.0 32.0 32.0 33 20.5 26.0 28.5 31.0 31.5 32.5 32.5 33.0 33.0 33.0 33.0 34 21.0 26.5 29.5 32.0 32.5 33.5 33.5 33.5 34.0 34.0 34.0 35 22.0 27.5 30.5 32.5 33.5 34.5 34.5 34.5 34.5 35.0 35.0 36 22.5 28.5 31.0 33.5 34.5 35.0 35.5 35.5 35.5 35.5 36.0 37 23.0 29.0 32.0 34.5 35.5 36.0 36.5 36.5 36.5 36.5 36.5 38 23.5 30.0 33.0 35.5 36.5 37.0 37.5 37.5 37.5 37.5 37.5 39 24.5 30.5 34.0 36.5 37.5 38.0 38.5 38.5 38.5 38.5 38.5 40 25.0 31.5 34.5 37.5 38.5 39.0 39.5 39.5 39.5 39.5 39.5 41 25.5 32.5 35.5 38.0 39.5 40.0 40.5 40.5 40.5 40.5 40.5 42 26.5 33.0 36.5 39.0 40.0 41.0 41.5 41.5 41.5 41.5 41.5 43 27.0 34.0 37.0 40.0 41.0 42.0 42.0 42.5 42.5 42.5 42.5 44 27.5 34.5 38.0 41.0 42.0 43.0 43.0 43.5 43.5 43.5 43.5 45 28.5 35.5 39.0 42.0 43.0 44.0 44.0 44.5 44.5 44.5 44.5 46 29.0 36.5 40.0 43.0 44.0 45.0 45.0 45.5 45.5 45.5 45.5 47 29.5 37.0 40.5 43.5 45.0 46.0 46.0 46.5 46.5 46.5 46.5 48 30.0 38.0 41.5 44.5 46.0 47.0 47.0 47.5 47.5 47.5 47.5 49 31.0 38.5 42.5 45.5 47.0 47.5 48.0 48.5 48.5 48.5 48.5 50 31.5 39.5 43.5 46.5 48.0 48.5 49.0 49.5 49.5 49.5 49.5 51 32.0 40.5 44.0 47.5 48.5 49.5 50.0 5.0.0 50.5 50.5 50.5 52 33.0 41.0 45.0 48.5 49.5 50.5 51.0 51.0 51.5 51.5 51.5 53 33.5 42.0 46.0 49.5 50.5 51.5 52.0 52.0 52.0 52.5 52.5 54 34.0 42.5 47.0 50.0 51.5 52.5 53.0 53.0 53.0 53.0 53.0 55 35.0 43.5 47.5 51.0 52.5 53.5 54.0 54.0 54.0 54.0 54.0 56 35.5 44.5 48.5 52.0 53.5 54.5 55.0 55.0 55.0 55.0 55.0 57 36.0 45.0 49.5 53.0 54.5 55.5 56.0 56.0 56.0 56.0 56.0 58 36.5 46.0 50.0 54.0 55.5 56.5 56.5 57.0 57.0 57.0 57.0 59 37.5 46.5 51.0 55.0 56.0 57.5 57.5 58.0 58.0 58.0 58.0 60 38.0 47.5 52.0 55.5 57.0 58.5 59.0 59.0 59.0 59.0 59.0 Table XII (516) 575-3767 Page 30 of 40
Hardness Thickness Chart Steels Thickness Scale Inches 15N 30N 45N A D C.006 92 - - - - -.008 90 - - - - -.010 88 - - - - -.012 83 82 77 - - -.014 76 80 74 - - -.016 68 74 72 86 - -.018 X 66 68 84 - -.020 X 57 63 82 77 -.022 X 47 58 78 75 69.024 X X 51 76 72 67.026 X X 37 71 68 65.028 X X 20 67 63 62.030 X X X 60 58 57.032 X X X X 51 52.034 X X X X 43 45.036 X X X X X 37.038 X X X X X 28.040 X X X X X 20 NOTES: Table XIII Per Wilson (Rockwell) Chart No. 55 1. Any greater thickness and hardness can be safely tested on the indicated scale. 2. X means no minimum hardness. (516) 575-3767 Page 31 of 40
Corrections to be added to A & C Scale Reading to Compensate for the Effect of Surface Curvature Scale Reading Diameter of Curvature Inches 3/8 ½ 5/8 ¾ 7/8 1 ¼ 0 5 10 15 20 6.0 4.5 3.5 2.5 2.0 1.5 1.5 25 5.5 4.0 3.0 2.5 2.0 1.5 1.0 30 5.0 3.5 2.5 2.0 1.5 1.5 1.0 35 4.0 3.0 2.0 1.5 1.5 1.0 1.0 40 3.5 2.5 2.0 1.5 1.0 1.0 1.0 45 3.0 2.0 1.5 1.0 1.0 1.0 0.5 50 2.5 2.0 1.5 1.0 1.0 0.5 0.5 55 2.0 1.5 1.0 1.0 0.5 0.5 0.5 60 1.5 1.0 1.0 0.5 0.5 0.5 0.5 65 1.5 1.0 1.0 0.5 0.5 0.5 0.5 70 1.0 1.0 0.5 0.5 0.5 0.5 0.5 75 1.0 0.5 0.5 0.5 0.5 0.5 0 80 0.5 0.5 0.5 0.5 0.5 0 0 85 0.5 0.5 0.5 0 0 0 0 90 0.5 0 0 0 0 0 0 Table XIV (516) 575-3767 Page 32 of 40
Corrections to be added to 15N, 30N and 45N Scale Reading to Compensate for the Effect of Surface Curvature Scale Diameter of Curvature Inches Reading 1/8 ¼ 3/8 ½ 5/8 ¾ 1 0 5 10 15 20 6.0 3.0 2.0 1.5 1.5 1.5 1.0 25 5.5 3.0 2.0 1.5 1.5 1.5 1.0 30 5.5 3.0 2.0 1.5 1.0 1.0 1.0 35 5.0 2.5 2.0 1.5 1.0 1.0 1.0 40 4.5 2.5 1.5 1.5 1.0 1.0 1.0 45 4.0 2.0 1.5 1.0 1.0 1.0 1.0 50 3.5 2.0 1.5 1.0 1.0 1.0 1.0 55 3.5 2.0 1.5 1.0 1.0 0.5 0.5 60 3.0 1.5 1.0 1.0 0.5 0.5 0.5 65 2.5 1.5 1.0 0.5 0.5 0.5 0.5 70 2.0 1.0 1.0 0.5 0.5 0.5 0.5 75 1.5 1.0 0.5 0.5 0.5 0.5 0 80 1.0 0.5 0.5 0.5 0 0 0 85 0.5 0.5 0.5 0 0 0 0 Table XV (516) 575-3767 Page 33 of 40
Hardness Requirements for Wrought 300 Series Stainless Steel (refer to notes 1 and 2) Condition Rockwell Hardness B C 15N Annealed 95 Maximum ¼ Hard 25-34 73-78 ½ Hard 33-40 77-81 ¾ Hard 39 Minimum 80 Minimum Full Hard 41 Minimum 82 Minimum NOTES: 1. This table is applicable to the following grades of stainless steel 301, 302, 303, 304/304L, 316/316L, 321 and 347. 2. Procurement and acceptable of these stainless steels are based on tensile properties only. The hardness values, as listed above, are not adequate for rejection but are meant as a guide. Material with hardness readings below the minimums or above the maximums shown in this table shall be submitted to the Technical Services Laboratory for verification. Table XVI (516) 575-3767 Page 34 of 40
Hardness to Tensile Strength Values for Wrought Carbon and Low Alloy Steels Heat Treat Condition or Tensile Strength Range (PSI) Rockwell Scale B C Diameter of Impression Brinell Scale Hardness Number Annealed (1) Normalized (1) 125/150 KSI 27-32 3.73-3.50 265-302 150/165 KSI 33-37 3.45-3.23 311-345 165/180 KSI 37-40 3.28-3.16 345-373 180/200 KSI 39-42 3.20-3.09 363-391 200/220 KSI 43-46 3.05-2.94 401-432 220/240 KSI 46-49 2.94-2.84 432-464 240/260KSI 49-52 260/280 KSI 50-53 280/305 KSI 53-56 (1) The hardness of annealed and normalized steels can vary greatly depending upon alloy and processing parameters. A review of drawings, specifications and purchase orders should be performed for specific requirements. Table XVII (516) 575-3767 Page 35 of 40
Approximate Equivalent Hardness Values for Steel Rockwell Hardness Scale C A D 15N 30N 45N 20 60.5 40.1 69.4 41.5 19.6 21 61.0 40.9 69.9 42.3 20.7 22 61.5 41.6 70.5 43.2 22.0 23 62.0 42.1 71.0 44.0 23.1 24 62.4 43.1 71.6 45.0 24.3 25 62.8 43.8 72.2 45.9 25.5 26 63.3 44.6 72.8 46.8 26.7 27 63.8 45.2 73.3 47.7 27.8 28 64.3 46.1 73.9 48.6 28.9 29 64.7 47.0 74.5 49.5 30.1 30 65.3 47.7 75.0 50.4 31.3 31 65.8 48.4 75.6 51.3 32.5 32 66.3 49.2 76.1 52.1 33.7 33 66.8 50.0 76.6 53.3 34.9 34 67.4 50.8 77.2 54.2 36.1 35 67.9 51.5 77.7 55.0 37.2 36 68.4 52.3 78.3 55.9 38.4 37 68.9 53.1 78.8 56.8 39.6 38 69.4 53.8 79.4 57.7 40.8 39 69.9 54.6 79.9 58.6 41.9 40 70.4 55.4 80.4 59.5 43.1 41 70.9 56.2 80.9 60.4 44.3 42 71.6 56.9 81.5 61.3 45.5 43 72.0 57.7 82.0 62.2 46.7 44 72.5 58.5 82.5 63.1 47.8 45 73.1 59.2 83.0 64.0 49.0 46 73.6 60.0 83.5 64.8 50.3 47 74.1 60.8 83.9 65.8 51.4 48 74.7 61.4 84.5 66.7 52.5 49 75.2 62.1 85.0 67.6 53.8 50 75.9 63.1 85.5 68.5 55.0 51 76.3 63.8 85.9 69.4 56.1 52 76.8 64.6 86.4 70.2 57.4 53 77.4 65.4 86.9 71.2 58.6 54 78.0 66.1 87.4 72.0 59.8 55 78.5 66.9 87.9 73.0 60.9 Table XVIII (516) 575-3767 Page 36 of 40