QUALITY OPERATIONS STANDARD

Transcription

1 QUALITY OPERATIONS STANDARD TITLE: SELLER REQUIREMENTS FOR TEMPER INSPECTION BY ELECTRICAL MEASUREMENT AND/OR HARDNESS MEASUREMENT Standard Number: QOS 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) Page 1 of 40

2 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) Page 2 of 40

3 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 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) Page 3 of 40

4 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) Page 4 of 40

5 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 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) Page 5 of 40

6 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) Page 6 of 40

7 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 ) 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 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) Page 7 of 40

8 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 T6 aluminum is 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) Page 8 of 40

9 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) Page 9 of 40

10 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) Page 10 of 40

11 XI. TABLES: (continued) 5. How to use Conductivity Correction Tables. A. Example 1: Find the conductivity values for 2024-T6 aluminum 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 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 Follow this row to the right until you are under the inch thickness column. 4. The corrected conductivity value is Select the larger uncorrected result from step # 1 (39.0). Reference Table VIII, look under the Uncorrected Conductivity Values in % IACS and locate Follow this row to the right until you are under the inch thickness column. 7. The corrected conductivity value is The Corrected Conductivity for inch thick 2024-T6 Aluminum is % IACS. These are the values that must be obtained directly from the conductivity meter for material to be considered acceptable. (516) Page 11 of 40

12 XI. TABLES: (continued) B. Example 2: Find the conductivity values for 7075-T6 Clad Aluminum 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 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 Since this column lists values for 29 and 30, you must interpolate to determine the corrected value for Follow rows 29 and 30 to the right until you are under the thickness column. The corrected values of 32.5 and 33.0 should be attained. 4. The corrected conductivity interpolated value result is Select the larger uncorrected result obtained from Step 1, 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 Follow rows 34 and 35 to the right until you are under the thickness column. The corrected values of 37.0 and 38.0 should be attained. 6. The corrected conductivity interpolated value result is The Corrected Conductivity for inch thick 7075-T6 Clad Aluminum is % IACS. These are the values that must be obtained directly from the conductivity meter for material to be considered acceptable. (516) Page 12 of 40

13 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) 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) Page 13 of 40

14 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/ Table II (516) Page 14 of 40

15 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/ Table III (516) Page 15 of 40

16 Hardness and Electrical Conductivity Requirements for Aluminum Alloy Plate Electrical Conductivity % IACS Alloy & Temper Minimum Upper Maximum RB Hardness (Minimum) 2014-T T X24-T X24-T T T T T W T T T W T T T T T T 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) Page 16 of 40

17 Hardness Requirements for Wrought Aluminum Alloys Excluding Plate Alloy & Temper Rockwell Hardness Scale B E H 15T 30T MAX 1100-H12 46 MIN 1100-H14 65 MIN 1100-H16 67 MIN 1100-H18 74 MIN MAX 3003-H12 68 MIN 3003-H H H MAX 95 MAX 2014-T3XX T4XX T6XX T6XX ALCLAD / MAX 95 MAX 2024/2124-T3XXX /2124-T4XXX /2124-T6XXX /2124-T8XXX /2124-T /2124-T /2124-T /2124-T3XXX ALCLAD inch in thickness 2024/2124-T3XXX ALCLAD inch in thickness 2024/2124-T3XXX ALCLAD over inch in thickness 2024/2124-T4XXX ALCLAD inch in thickness 2024/2124-T4XXX ALCLAD inch in thickness 2024/2124-T4XXX ALCLAD inch in thickness 2024/2124-T4XXX ALCLAD over inch in thickness T6XXX ALCLAD inch in thickness 2024/2124-T6XXX ALCLAD inch in thickness 2024/2124-T6XXX ALCLAD inch in thickness 2024/2124-T6XXX ALCLAD over inch in thickness Table V (516) Page 17 of 40

18 Hardness Requirements for Wrought Aluminum Alloys Excluding Plate (continued) Alloy & Temper Rockwell Hardness Scale B E H 15T 30T 2024/2124-T8XXX ALCLAD inch in thickness 2024/2124-T8XXX ALCLAD inch in thickness T3XXX MAX 34 MAX T6XXX T8XXX T42 85 MIN 76 MIN 2224-T3XXX T MAX 92 MAX 66 MAX 5052-H H H H MAX 6061-T4XXX T6XXX T5XXX T6XXX T73XXX T73XXX/T74XXX T76XXX T6XXX / MAX 18 MAX 7075/7175-T6XXX /7175-T73XXX /7175-T736X/T74XXX /7175-T76XXX /7175-T6XXX ALCLAD /7175-T6XXX ALCLAD inch in thickness 7075/7175-T6XXX ALCLAD inch in thickness 7075/7175-T6XXX ALCLAD OVER inch in thickness Table V (516) Page 18 of 40

19 Hardness Requirements for Wrought Aluminum Alloys Excluding Plate (continued) Alloy & Temper Rockwell Hardness Scale B E H 15T 30T 7075/7175-T73XXX ALCLAD inch in thickness 7075/7175/T73XXX ALCLAD inch in thickness 7075-T73XX Hand Forgings less than 2 inch thick 7075-T73XX Hand Forgings inch thick 7075-T73XX Hand Forging inch thick 7075-T 73XX Hand Forgings greater than 4 inch thick 7075-T76XXX inch thick 7075-T76XXX inch thick 7075-T76XXX inch thick 7079-T6XXX T6XXX T76XXX Table V (516) Page 19 of 40

20 Hardness Requirements for Aluminum Alloy Castings Alloy & Temper Casting Type Rockwell Hardness (Minimum) E Scale 43F Sand 30 43F Permanent Mold T4 Sand T4 Permanent Mold T6 Sand T6 Permanent Mold T4 Sand T6 Sand T6 Permanent Mold T6 QQ-A A356-T6 Class 10 (MIL-A-21180) 80 A356-T6 Class A356-T6 Class T571 Sand T77 Sand T571 Permanent Mold T61 Permanent Mold T61 Sand F Sand F Sand 73 40E-T5 Sand 77 A380 Die Casting Die Casting Die Casting Die Casting 78 85X Die Casting 75 A360 Die Casting Die Casting 78 NOTE: For Alloys and tempers not listed, contact the Northrop Grumman Technical Services Laboratory for assistance. Table VI (516) Page 20 of 40

21 Electrical Conductivity Requirements for Wrought Aluminum Alloys (Bare).063 Inches and Greater in Thickness (Excluding Plate) Alloy & Temper (516) Page 21 of 40 Range (%IACS) 1100-All T3XX T4XX T6XX T4XXX / /2124-T3XXX /2124-T4XXX /2124-T6XXX /2124-T8XXX T3XXX T6XXX T8XXX T T3XXX T H12,H14,H16,H ALL T4XXX T6XXX T5XXX T6XXX T73XXX 38.0 MINIMUM 7049-T76XXX T73651/T T73652/T T76XXX / /7175-WXXX /7175-T6XXX /7175-T7XXX T6XXX T MINIMUM 7150-T651X 32.0 MINIMUM 7178-T6XXX T76XXX Table VII Note: Conductivity of 7050-T76511 aluminum alloy per AMS Conductivity of this material is acceptable below the required minimum of 39.0 if the requirements of section of AMS-4340 are satisfactory.

22 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 & above Corrected Conductivity Values On Percent IACS Table VIII (continued on next page) (516) Page 22 of 40

23 Uncorrected Conductivity Values In % IACS Electrical Conductivity for Bare Thin Gauge Aluminum (continued from previous page) Single Thickness (Gauge), Inches & above Corrected Conductivity Values On Percent IACS 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 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) Page 23 of 40

24 Electrical Conductivity for 2024, 7075, 7079, & 7178 Clad Aluminum Alloys (Hocking Autosigma 2000) Uncorrected Single Thickness (Gauge), Inches Conductivity Values In % IACS Corrected Conductivity Values in Percent IACS Table IX (516) Page 24 of 40

25 Electrical Conductivity for 2014, 2219 Clad Aluminum Alloys (Hocking Autosigma 2000) Uncorrected Single Thickness (Gauge), Inches Conductivity Values In % IACS Corrected Conductivity Values in Percent IACS Table X (516) Page 25 of 40

26 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) Page 26 of 40

27 Electrical Conductivity for 3003 and 6061 Clad Aluminum Alloys (Hocking Autosigma 2000) Uncorrected Single Thickness (Gauge), Inches Conductivity Values In % IACS Corrected Conductivity Values in Percent IACS Table XI (516) Page 27 of 40

28 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 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 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) Page 28 of 40

29 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) Page 29 of 40

30 Uncorrected Conductivity Values In IACS Electrical Conductivity Correction Factors for Curved Surfaces Diameter, Inches Table XII (516) Page 30 of 40

31 Hardness Thickness Chart Steels Thickness Scale Inches 15N 30N 45N A D C X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 20 NOTES: Table XIII Per Wilson (Rockwell) Chart No Any greater thickness and hardness can be safely tested on the indicated scale. 2. X means no minimum hardness. (516) Page 31 of 40

32 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 Table XIV (516) Page 32 of 40

33 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 Table XV (516) Page 33 of 40

34 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 ½ Hard 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 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) Page 34 of 40

35 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 /165 KSI /180 KSI /200 KSI /220 KSI /240 KSI /260KSI /280 KSI /305 KSI (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) Page 35 of 40

36 Approximate Equivalent Hardness Values for Steel Rockwell Hardness Scale C A D 15N 30N 45N Table XVIII (516) Page 36 of 40