1、_ 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 there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AMS5918 AEROSPACE MATERIAL SPECIFICATION AMS5918 Issued 2011-09 Reaffirmed 2017-12 Cobalt Alloy
5、, Corrosion and Heat Resistant, Bars 62Co-28Cr-6Mo Warm-Worked RATIONALE AMS5918 has been reaffirmed to comply with the SAE Five-Year Review policy. 1. SCOPE 1.1 Form This specification covers a corrosion and heat-resistant cobalt-chromium-molybdenum alloy in the form of bars. 1.2 Application These
6、products have been used typically for parts requiring a combination of high strength, wear resistance, and corrosion resistance but usage is not limited to such applications. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in this sp
7、ecification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measu
8、res to ensure the health and safety of all personnel involved. 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 unle
9、ss 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,
10、Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS2241 Tolerances Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bars and Wire AMS2371 Quality Assurance Sampling and Testing Corrosion and Heat-Resistant Steels and Alloys Wrought Pr
11、oducts and Forging Stock ARP1917 Classification of Terms Used in Aerospace Metals Specifications 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM E 8/E 8M Tension Testing of Metallic
12、 Materials ASTM E 18 Rockwell Hardness of Metallic Materials ASTM E 112 Determining Average Grain Size ASTM E 140 Standard Hardness Conversion Tables for Metals ASTM E 354 Chemical Analysis of High Temperature, Electrical, Magnetic, and Other Similar Iron, Nickel and Cobalt Alloys 3. TECHNICAL REQUI
13、REMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 354, by spectrochemical methods, or by other analytical methods acceptable to purchaser. TABLE 1 - COMPOSITION Element (3.1.1) min max Carbon 0.15 Mangane
14、se 1.0 Silicon - 1.0 Chromium 26 30 Molybdenum 5.0 7.0 Nickel - 1.0 Iron - 1.0 Nitrogen - 0.25 Cobalt remainder 3.1.1 These composition limits do not preclude the presence of other elements. Limits may be established and analysis required for unnamed elements by agreement between the manufacturer or
15、 supplier and purchaser. 3.1.2 Cobalt may be reported as “remainder”, or as the difference between the sum of results for all elements and 100%, or as the result of direct analysis. 3.1.3 When all elements in the table are analyzed, the sum shall be 99.5% minimum, but such determination is not requi
16、red for routine acceptance of each lot. SAE INTERNATIONAL AMS5918 Page 2 of 5_ 3.2 Condition 3.2.1 Warm-Worked Deformed below the recrystallization temperature whereby some work hardening and/or phase transformation occurs. 3.3 Properties The product shall conform to the following requirements (See
17、8.4 and 8.5): 3.3.1 Tensile Properties Shall be as shown in Table 2 for the warm-worked condition, determined in accordance with ASTM E 8/E 8M. TABLE 2 - MINIMUM LONGITUDINAL TENSILE PROPERTIES Thickness Range, inch (mm) Tensile Strength ksi (MPa) Yield Strength at 0.2% Offset ksi (MPa) Elongation %
18、 RA, % 2.500 to 3.000, incl. (63.50 to 76.20, incl.) 188 (1296 MPa) 144 ksi (993 MPa) 7 10 3.001 to 4.000, incl. (76.22 to 101.6, incl.) 178 (1227 MPa) 131 ksi (903 MPa) 7 10 3.3.2 Hardness Bars and rods 2.500 to 4.000 inch (63.50 to 101.6 mm) in nominal diameter shall have hardness of 36 to 48 HRC,
19、 or equivalent (See 8.2), in the warm-worked condition determined in accordance with ASTM E 18. 3.4 Quality Product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from defects detrimental to usage of the product. 3.5 Tolerances Shall
20、conform to AMS2241. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testin
21、g deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests All technical requirements are acceptance tests and shall be performed on each heat or lot as applicable. 4.3 Sampling and Testing Shall be in accordance with AMS2371 and the following; a lo
22、t shall be all product with the same form, from the same heat, processed at one time through all steps of manufacture. SAE INTERNATIONAL AMS5918 Page 3 of 5_ 4.3.1 One or more chemical analysis samples from each heat shall be analyzed in accordance with 3.1. 4.3.2 One or more longitudinal tensile sp
23、ecimens from each lot shall be tested in accordance with 3.3.1. The axis of tensile specimens shall be located midway between the center and surface of product over 1.50 inches (38.1 mm) in nominal cross-sectional thickness. 4.3.3 One or more hardness specimens from each lot shall be tested in accor
24、dance with 3.3.2 at mid-radius location. 4.4 Reports The vendor of the product shall furnish with each shipment a report showing the results of tests on each lot to determine conformance to the technical requirements. This report shall include the purchase order number, lot number, AMS5918, size, an
25、d quantity. 4.5 Resampling and Retesting Shall be in accordance with AMS2371. 5. PREPARATION FOR DELIVERY 5.1 Identification Individual pieces or bundles shall have attached a durable tag marked with not less than the purchase order number, this specification number and nominal size or shall be boxe
26、d and the box marked with the same information. 5.2 Packaging Product shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the product to ensure carrier acceptance an
27、d safe delivery. 6. ACKNOWLEDGMENT A vendor shall mention this specification number in all quotations and when acknowledging purchase orders. 7. REJECTIONS Product not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change b
28、ar (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 document. An (R) symbol to the left of the document title indicates a complete revision of the document, including tec
29、hnical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are sho
30、wn as the approximate equivalents of the primary units and are presented only for information. 8.3 Hardness conversion tables for metals are presented in ASTM E 140. 8.4 Terms used in AMS are clarified in ARP1917. SAE INTERNATIONAL AMS5918 Page 4 of 5_ 8.5 Purchaser may specify special combinations
31、of properties such as ductility, and fatigue life. These characteristics are achieved by special fabrication and processing and the requirements of 3.3 do not apply to such products. Specific technical requirements and testing of these special products shall be agreed upon by purchaser and vendor. 8.6 Purchase documents should specify not less than the following: AMS5918 Product form and size of product desired Quantity of product desired Special technical requirements and testing, if required (See 8.4). PREPARED BY AMS COMMITTEE “F“ SAE INTERNATIONAL AMS5918 Page 5 of 5_
