AMS 2759-9C-2007

SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright © 2007 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerService@sae.org SAE WEB ADDRESS: http://www.sae.org AMS 2759/9C AEROSPACE MATERIAL SPECIFICATION Issued 1996-11 Revised 2007-11 Superseding AMS 2759/9B (R) Hydrogen Embrittlement Relief (Baking) of Steel Parts RATIONALE AMS 2759/9C results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Purpose This specification covers the requirements for embrittlement relief (baking) of heat treated steel parts to remove hydrogen infused during plating and certain other chemical processing such as stripping, chemical milling, pickling, and etching. 1.2 Application This specification is applicable to parts made from carbon, low-alloy, and martensitic stainless steel heat treated to a minimum strength of 180 ksi (1241 MPa) or heat treated to a minimum hardness of 40 HRC or equivalent. It is also applicable to threaded fasteners made from carbon, low-alloy, or martensitic stainless steels heat treated to a minimum strength of 150 ksi (1034 MPa) or 34 HRC or equivalent, parts made from high strength precipitation hardening stainless steels other than A-286, and steel parts which have been case hardened (carburized, nitrided, nitrocarburized, or carbonitrided). See 8.2. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS 2649 Etch Inspection of High Strength Steel Parts AMS 2750 Pyrometry AMS 2759 Heat Treatment of Steel Parts Copyright SAE International Provided by IHS under license with SAE Licensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 23:36:19 MSTNo reproduction or networking permitted without license from IHS --`,,,``,``,`,,,,``,,`,,,,,```-`-`,,`,,`,`,,`--- SAE AMS 2759/9C - 2 - 3. TECHNICAL REQUIREMENTS In the event of a conflict between this specification and the document citing this specification, that document shall prevail. 3.1 Pyrometry shall conform to AMS 2750 furnace class 5, instrumentation type D, as a minimum. 3.2 Heat treatment equipment shall conform to AMS 2759 and requirements specified herein. Furnaces shall be circulating-air type. 3.3 Procedure 3.3.1 Cleaning Parts shall be clean prior to baking. 3.3.2 Racking and Spacing Parts shall be placed in racks or trays, made of mesh or expanded metal, or supported or suspended so as to allow free circulation of the heating medium, except small parts may be randomly arranged in trays providing that layers of parts are not thicker than two inches (51 mm) and the distance between the layers is not less than two inches (51 mm). 3.3.2.1 Thickness of layers of small parts randomly arranged in trays may be greater than two inches (51 mm), provided tests have been made with load thermocouples to confirm that the center of the coldest load will reach the set temperature minus 25 F degrees (14 C degrees) within one hour of loading. 3.3.3 Parts shall be baked after the completion of the chemical processing or plating designated in Table 1 or 2. (See 8.2.) 3.3.3.1 Delay Time Limits The elapsed time between completion of plating or other chemical processing operations and start of heating parts in the baking furnace shall not exceed four hours except, when baking is required after etch inspection (refer to footnote 4 of Tables 1 and 2) to detect abusive grinding or machining, the elapsed time shall not exceed 24 hours. 3.3.3.2 Bake Set Temperature 3.3.3.2.1 Standard bake set temperature shall be 375 °F (191 °C) in accordance with Table 1, nonstandard baking set temperatures listed in Table 2 shall be used for parts made from the following materials/processes: • Carburize or carbonitride case hardening heat treatment • AISI 52100 steel • Type 440C corrosion and heat resisting steel • Music wire • Other alloys tempered below 400 °F (204 °C). 3.3.3.3 Bake Soak Time Bake soak time shall be as designated in Table 1 or 2, as applicable. 3.3.3.4 Start of Soak Time Soaking time shall commence when parts are placed in the furnace, the furnace door(s) are closed, and the temperature indicated by the furnace control instrument is within 25 F degrees (14 C degrees) of the set temperature. Copyright SAE International Provided by IHS under license with SAE Licensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 23:36:19 MSTNo reproduction or networking permitted without license from IHS --`,,,``,``,`,,,,``,,`,,,,,```-`-`,,`,,`,`,,`--- SAE AMS 2759/9C - 3 - 3.3.3.5 Soaking Interruptions 3.3.3.5.1 If the delay time (3.3.3.1) is less than two hours, soaking may be interrupted for the purpose of adding or removing parts. If the delay time (3.3.3.1) is two hours or more, parts shall be soaked for at least one hour before any such interruption. 3.3.3.5.2 If the temperature indicated by the control instrument drops more than 25 F degrees (14 C degrees) below the set temperature, the time during which the indicated temperature was below that temperature shall not be considered part of the soaking time of any parts in the furnace. TABLE 1 - MINIMUM BAKE SOAK TIME (HOURS) AT 375 °F (191 °C) Platings (8) Chemical Treatments Steel/Part Description (9) Specified Temper, Minimum Strength or Minimum Hardness (1) Cd & Cd-Ti Ni (2) Cr Zn Cu Ag Au Sn Zn-Ni Chem (3) Etch (4) AISI 1095 180 ksi (1241 MPa) or 40 HRC (5) 23 23 8 23 8 3 3 5 8 3 4 AF1410, HP 9Ni-4Co-0.3C, AerMet 100 All 23 23 8 23 8 8 5 5 23 8 4 Other High Strength Carbon, Low-Alloy, Tool Steel 220 ksi (1517 MPa) or 46 HRC (6) 23 23 23 23 8 3 3 5 23 8 4 Lower Strength Carbon, Low- Alloy, Tool Steel 180 ksi (1241 MPa) or 40 HRC (5) (7) 8 8 3 23 8 3 3 3 8 3 4 High Strength Martensitic Stainless other than 440C 220 ksi (1517 MPa) or 46 HRC (6) 23 23 8 23 8 3 3 5 23 8 NA Lower Strength Martensitic Stainless 180 ksi (1241 MPa) or 40 HRC (7) 3 3 3 23 8 3 3 3 8 3 NA 17-7PH® 15-7PH® 17-4PH® 15-5PH® Stainless CH900, H900, H925, H950, RH950 23 23 8 23 8 3 3 3 8 3 NA CUSTOM 455® & 465® PH13-8 Mo® Stainless H950, H1000 23 23 8 23 8 8 3 8 23 3 NA NOTES: NA - Not applicable (1) Or equivalent (2) Includes electroless nickel, unless age hardened within four hours of plating (3) Chemical Processing: Etching, Stripping, Pickling, Chemical Milling (4) Etch Inspection to detect abusive grinding/machining or the presence of carburizing - Baking is required after etch inspection when hydrochloric or other reducing acid is used (e.g., AMS 2649, Type 2 hydrochloric acid desmut). (5) Or higher, but having minimum less than 220 ksi (1517 MPa) or 46 HRC (6) Or higher specified minimum hardness (7) Threaded fasteners - minimum 150 ksi (1034 MPa) and higher or 34 HRC or equivalent but minimum less than 180 ksi (1241 MPa) or 40 HRC or equivalent - three hours for all processes (8) For platings not listed, use baking time shown for cadmium. (9) ® Custom 455 and Custom 465 are registered trade names of Carpenter Technology Corp. 17-7PH, 15-5PH, 15-7PH, PH13-8 Mo, and 17-4PH are registered trademarks of AK Steel (Armco). Copyright SAE International Provided by IHS under license with SAE Licensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 23:36:19 MSTNo reproduction or networking permitted without license from IHS - - ` , , , ` ` , ` ` , ` , , , , ` ` , , ` , , , , , ` ` ` - ` - ` , , ` , , ` , ` , , ` - - - SAE AMS 2759/9C - 4 - TABLE 2 - MINIMUM BAKE SOAK TIMES (HOURS) ON HIGH ALLOY, ULTRA-HIGH STRENGTH STEELS, AND FOR CASE HARDENED SURFACES Platings (6) Chemical Treatments Steel/Part Description (9) Specified Minimum Hardness (1) (8) Bake Temperature oF (oC) Cd & Cd-Ti Ni (2) Cr TDCr (7) Zn Cu Ag Au Sn Zn-Ni Chem (3) Etch (4) Music Wire All 325 °F (163 °C) 23 23 8 96 23 23 8 5 5 23 8 8 52100 62 HRC (5) 275 °F (135 °C) 23 23 23 96 23 23 23 5 5 23 8 4 52100 Below 62 HRC 375 °F (191 °C) 23 23 23 23 23 8 23 5 5 8 4 4 440C Stainless 46 HRC (5) 300 °F (149 °C) 23 23 8 96 23 8 8 5 8 23 8 NA Carburized Carbonitrided All Parts 275 °F (135 °C) 23 23 8 23 23 23 8 5 5 23 8 8 Nitrided Nitrocarburized All Parts 375 °F (191 °C) 8 8 8 23 8 8 8 3 3 8 3 4 NOTES: NA - Not applicable (1) Or equivalent (2) Includes electroless nickel unless age hardened within four hours (3) Chemical Processing: Etching, Stripping, Pickling, Chemical Milling (4) Etch Inspection to detect abusive grinding/machining or the presence of carburizing - Baking is required after etch inspection when hydrochloric or other reducing acid is used (e.g., AMS 2649, Type 2 hydrochloric acid desmut). (5) Or higher specified minimum hardness (6) For platings not listed, use baking time shown for cadmium. (7) Thin dense chromium plating (e.g., AMS 2438). (8) For induction hardened or carburized parts, an extended bake time in excess of 23 hours is prohibited. (9) Other alloys – For other alloys tempered at 300 °F (149 °C) or lower, a baking schedule of 275 °F (135 °C) for 96 hours shall be used. For other alloys tempered at 400 °F (204 °C) and hotter, a baking schedule of 375 °F (191 °C) for 23 hours shall be used. For other alloys tempered between 300 °F (149 °C) and 400 °F (204 °C), contact the cognizant engineering organization to verify the proper baking schedule. 3.3.3.6 Multistep Processes An additional intermediate baking treatment is required if there is an interruption between steps exceeding two hours or if the elapsed time between the start of the first step and start of final baking exceeds four hours. 3.3.3.6.1 When the strength is 240 ksi (1655 Mpa) or lower (49 HRC or less), the intermediate bake soak time shall be three hours minimum, unless parts are nickel plated. See 3.3.3.6.3. 3.3.3.6.2 When the strength is over 240 ksi (1655 Mpa) (over 49 HRC), the intermediate bake the soak time shall be six hours minimum, unless parts are nickel plated. See 3.3.3.6.3. 3.3.3.6.3 When parts are nickel plated and heat treated to 200 ksi (1379 Mpa) or higher (43 HRC or harder), the intermediate bake soak time shall be the full amount of time shown in Table 1 or 2, as applicable. 3.3.3.6.4 After completion of the final step of chemical treatment or plating, full baking in accordance with applicable Table 1 or 2 is required. 3.4 Records Records shall be maintained that show the identification and the following for each lot: 3.4.1 Date and time of completion of the plating or other chemical process. 3.4.2 Date and time of start of baking. 3.4.3 Date and time of start of soak. Copyright SAE International Provided by IHS under license with SAE Licensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 23:36:19 MSTNo reproduction or networking permitted without license from IHS - - ` , , , ` ` , ` ` , ` , , , , ` ` , , ` , , , , , ` ` ` - ` - ` , , ` , , ` , ` , , ` - - - SAE AMS 2759/9C - 5 - 3.4.4 Date and time of completion of baking. 3.4.5 Furnace control instrument set temperature. 3.4.6 Furnace identification. 4. QUALITY ASSURANCE PROVISIONS 4.1 Reports Processor’s reports shall include the baking time and temperature and shall state that baking was performed in accordance with AMS 2759/9C. 4.2 Records shall be retained for at least five years, including all information required in 3.5, and shall be available for review by authorized representatives of purchaser. 5. PREPARATION FOR DELIVERY See AMS 2759. 6. ACKNOWLEDGMENT See AMS 2759. 7. REJECTIONS See AMS 2759. 8. NOTES 8.1 A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technical revisions. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only. 8.2 Ordering Data In order to ensure that the appropriate baking treatment is applied to each lot of parts, it is essential that the processor be furnished with information identifying the material and its minimum strength or hardness or, in the case of precipitation hardening stainless steel, its temper. Additionally, the tempering temperatures should be furnished to the processor for carburized or carbonitrided parts and parts fabricated from music wire, 52100, 440C, or any other alloy tempered below 375 °F (191 °C). 8.3 Terms used in AMS are clarified in ARP1917. 8.4 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. PREPARED BY “AMEC” AND AMS COMMITTEE “B” Copyright SAE International Provided by IHS under license with SAE Licensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 23:36:19 MSTNo reproduction or networking permitted without license from IHS --`,,,``,``,`,,,,``,,`,,,,,```-`-`,,`,,`,`,,`--- 主营业务范围：ASTMASTMASTMASTM、NASNASNASNAS、NASMNASMNASMNASM、MILMILMILMIL、ISOISOISOISO、ENENENEN、 DINDINDINDIN、JISJISJISJIS等技术 标准 excel标准偏差excel标准偏差函数exl标准差函数国标检验抽样标准表免费下载红头文件格式标准下载 翻译；技术资料翻译；NADCAPNADCAPNADCAPNADCAP认证 标准资料翻译；国外技术标准中文版优惠低价代购等。 业务 QQQQQQQQ：2298175560229817556022981755602298175560 专业 专注于技术翻译 诚信 实惠 物超所值的服务可靠的质量保证