TECHNICAL REQUIREMENTS FOR PRECIPITATION HARDENING (SS 17-4 PH and PH 13-8 MO) STAINLESS STEEL BARS

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1 TECHNICAL REQUIREMENTS FOR PRECIPITATION HARDENING (SS 17-4 PH and PH 13-8 MO) STAINLESS STEEL BARS 1.0 SCOPE This Specification establishes the requirements for manufacture, inspection, testing and supply of Precipitation Hardening Stainless Steel bars to ASTM- A564-Gr-630 (17-4 PF SS- MIDHANI grade MDN-174). 2.0 REQUIREMENTS 2.1 Material Specification All the Precipitation Hardening Stainless Steel bars shall conform and meet to the requirements of ASTM-A-564 Grade 630 (17-4 PF SS- MIDHANI grade MDN-174) and Grade XM 13. The material supplied shall also meet the additional requirements detailed in this Specification. 2.2 Steel making process The process of manufacture of the steel shall be as per ASTM-A-564 and shall be either Electro Slag Refined (ESR) or Consumable Electrode Vacuum Arc Remelted (CVAR) quality All Bars shall be hot rolled. Sizes that cannot be hot rolled can be forged Hot rolled/forged bars 75 mm dia and above shall be equalized by heating at 1030 ± 14 C for half an hour to one hour prior to cooling from forging temperature. After hot working, the hot rolled/forged bars below 75 mm dia shall be cooled to below 30 C. Similarly hot rolled/forged bars 75 mm dia and above which are equalized shall be cooled to below 30 C after the equalizing treatment is over. Subsequent to cooling below 30 C all bars shall be solution annealed after which all the bars shall be again cooled to below 25 C. For PH 13-8 MO bars the cooling shall be done to temperatures below 16 C prior to any further heat treatment operation. 2.3 Dimensional tolerances and surface conditions Unless otherwise specified the dimensional tolerances of all the bars shall be governed by the requirements of ASTM-A-484.

2 2.3.2 All the bars shall be supplied in the centreless ground or in the turned or peeled condition. The surface finish of the bars in the as supplied condition shall be better than 3.2 microns (125 micro inches) RMS Unacceptable surface defects shall be removed by grinding or machining provided : a) The minimum diameter of the sections where defects have been removed is not reduced to below that permitted by the tolerance indicated in ASTM-A b) The depression, after elimination of the surface defects, shall be blended uniformly into the surrounding surfaces. c) After elimination of the defects, the area is to be re-examined by wet magnetic particle inspection technique to ensure that the defect has been removed completely; and d) Repair of the defects by welding shall not be permitted. 2.4 Calibration of furnaces and furnace instrumentation Only furnaces checked for temperature uniformity having instruments (recorders, controllers, cold junction compensators etc.) and thermocouples calibrated for accuracy of indication of job temperature within ± 5 C for Precipitation Hardening and ± 14 C for Solution Annealing and Equalizing shall be used. 3.0 INSPECTION AND TESTING REQUIREMENTS 3.1 Chemical Analysis Chemical analysis shall be carried out as per ASTM-A-564 Grade 630 (17-4 PF SS- MIDHANI grade MDN-174). Two Product samples shall be analysed at random for each heat. The chemical composition as analysed shall meet the requirements specified in Table-1 of ASTM-A-564 for both Grades 630 and XM 13. Product Analysis Tolerances shall be as per ASTM-A Mechanical test Requirements General Mechanical testing comprising of tensile, hardness and impact tests shall be conducted in accordance with and shall meet the requirements of ASTM-A-564 (including for bars above mm dia). The test specimens and testing method shall be in accordance with ASTM-A-370. All tensile, impact and hardness values actually obtained after testing shall be recorded and furnished to the Purchaser Mechanical testing of bars to be supplied in solution annealed condition : For bars supplied in the solution annealed condition, the test coupons (of adequate length for machining the required number of tensile and impact test specimens specified below) shall be precipitation hardened to condition H1100 (595 C ± 5 C) for Grade 630 and shall be precipitation hardened to condition H 950 for Grade XM 13.

3 Hardness of test coupons The hardness of one each of test coupons for tensile and impact tests described below shall be first measured and recorded in the solution annealed condition (that is, prior to precipitation hardening). After precipitation hardening, to H1100 condition for Grade 630 and to H 950 for Grade XM 13, the hardness of the same coupons shall be once again measured and recorded Tension Test Three room temperature tension test shall be conducted from each steel melting heat per each solution annealing heat per each size of bar. Standard 12.5 mm dia, 50 mm gauge length, full size round test specimen to ASTM-A- 370 shall be used for tension testing Impact Test Impact tests at room temperature shall consist of testing three 10 mm square, 55 mm long full size Charpy V-notch impact specimens from each steel melting heat per each solution annealing heat per each size of bar Hardness test of Solution Annealed Bars In addition to the test at above two bars selected at random from each steel melting heat per each solution annealing heat per each size of bar shall be tested for Rockwell/Brinell hardness. Atleast 3 readings shall be taken from each bar either on the cylindrical surface or on a 15 mm thick slice taken from the bar. 3.3 Visual Inspection Prior to packaging, all the bars that are ready for shipment shall be 100% visually examined for any cracks or other unacceptable injurious defects that can be visually seen. For acceptance, the bars shall not have any visual cracks or other injurious defects. 3.4 Non-Destructive test requirements General All non-destructive tests set forth below shall be carried out on the bars after completion of heat treatment and machining (centreless grinding/turning/peeling) operation Magnetic particle examination All bars of all sizes shall be inspected by wet magnetic particle examination in accordance with ASTM-E-138. Acceptance standard shall be as follows: a) Only indications with major dimension greater than 1.5 mm shall be considered relevant.

4 b) The following relevant indications are unacceptable. b.1) Any linear indication greater than 1.5 mm long for bars less than 15 mm diameter, greater than 3.1 mm long for bars from 15 mm diameter to under 50 mm diameter, and 4.7 mm long for bars 50 mm diameter and greater. b.2) Rounded indications with dimensions greater than 3.1 mm for bar diameters less than 15 mm and greater than 4.7 mm for bar diameters 15 mm and greater. b.3) Four or more indications in a line separated by 1.5 mm or less edge to edge. b.4) Ten or more indications in any 3800 sq.mm. of area whose major dimension is not more than 150 mm with the dimensions taken in the most unfavourable location relative to the indications being evaluated. c) Any indication in excess of the acceptance standards at para (b) above, which is believed to be non relevant shall be regarded as a defect and shall be re-examined to verify whether or not actual defects are present. Surface conditioning limited to the extent of para above may precede the reexamination. Non relevant indications and broad areas of pigmentation, which would mask indications of defects, are unacceptable. d) All bars shall be demagnetised after magnetic particle examination. Residual magnetism in the bars shall be less than 2 Gausses. e) The detailed magnetic particle examination procedure to be followed by the Supplier shall be submitted to the Purchaser for approval Ultrasonic Examination All bars of size 50 mm diameter and above shall be 100% ultrasonically examined over the entire surface. Ultrasonic examination of each bar shall be carried out in accordance with specifications ASTM-A-388 and ASTM-A-745 using straight beam technique from two directions approximately at right angles to each other. The entire volume of each bar shall be examined. Acceptance Standard The acceptance level is QL-1 of ASTM-A-745, i.e., reference block having defect standard of 3.18 mm diameter flat bottom hole. Indications from a defect more than that from a 3.18 mm diameter flat bottom hole in the defect standard shall be cause for rejection of the bar. 4.0 IDENTIFICATION AND MARKING OF BARS

5 4.1 For sizes below 32 mm diameter, each bar shall be identified with the relevant heat number by clearly stenciling on the cylindrical surface at both ends. For sizes above 32 mm, each bar shall be punched with relevant heat number on both end faces. 5.0 TEST REPORTS TO BE FURNISHED BEFORE SHIPPING THE MATERIAL Certificates, test reports and inspection reports signed by a responsible technical representative of the Supplier covering all tests and analyses shall be furnised to the Purchaser. When inspection or testing is subcontracted to an outside agency the certificates/and reports shall be signed by a responsible technical representative of such agency and countersigned by the Supplier. The following certified test reports shall be furnished to the Purchaser and Purchaser s acceptance of material shall be obtained. All the test reports shall be appropriately co-related with the heat number and size of the bars. 5.1 Test reports for Chemical analysis as per para 3.1 above. 5.2 Certificates indicating the temperatures to which all bars have been cooled after hot rolling/forging and after solution annealing (para 2.2.3). 5.3 Test reports of tension, impact and hardness tests as per para 3.2 above. 5.4 Test reports for magnetic particle and ultrasonic examinations carried out on each bar (para 3.4). 5.5 Certificate of visual examination that the bars supplied are free from visual defects (para 3.3). 5.6 Certificates for solution annealing and precipitation hardening heat treatments based on relevant time and temperature charts. 5.7 Certificate stating that identification of bars has been done as per para 4 above. 5.8 Certificate of compliance. 6.0 QUALITY SURVEILLANCE 6.1 The overall quality control of procurement of the bars shall be the responsibility of the FM Head Supplier. However the bars purchased shall be subject to quality surveillance by NPC QA by verification of inspection/test reports and carrying out chemical analysis and mechanical/ndt tests. Carrying out of these tests is in the supplier scope of work under NPC-QA. 6.2 Clearance shall be obtained from NPC QA engineer before taking up the machining of these bars. 6.3 Items found unsatisfactory as per the requirements of this specification or items with any defects beyond acceptable limits specified, showing up during machining, shall be replaced by FM Head Supplier by items which are satisfactory. 6.4 Bars found unsatisfactory as to workmanship or material shall be removed by the Supplier and replaced by bars which are satisfactory.

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