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 theref
2、rom, 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 2013 SAE InternationalAll rights reserved. No part of this publication may b
3、e 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: +1 724-776-4970 (outside USA)Fax
4、: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS-S-7720BAEROSPACEMATERIALSPECIFICATIONAMS-S-7720 REV. BIssued 1997-09Noncurrent 2007-10Stabilized 2013
5、-07Superseding AMS-S-7720ASteel, Corrosion-Resistant (18-8) Bars, Wire andForging Stock (Aircraft Quality)RATIONALEAMS-S-7720B stabilizes this document because equivalent technical requirements are contained in other specifications.STABILIZATION NOTICEAMS-S-7720B has been declared “STABILIZED“ by AM
6、S Committee F and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of technical requirements. Newertechnology may exist. AMS Committee F has never performed a technical update of this document. Users of this docume
7、nt should refer any certification issues (e.g. exceptions listed on the certification report) to the cognizant engineering organization for their disposition. CAUTION: In many cases the purchaser is not the cognizant engineering organization (i.e. purchaser may be a sub tier supplier). AMS Committee
8、 F recommends that the following technically equivalent (e.g. properties, fit, form, function) specification be used for future procurement. This listing does not constitute authority to substitute these specifications for the “STABILIZED” specification.ASTM A 276 Stainless Steel Bars and Shapes, (r
9、efer to UNS designations S30200 and S31600)ASTM A 313/A 313M Stainless Steel Spring Wire, (refer to UNS designations S30200 and S31600)ASTM A 314 Stainless Steel Billets and Bars for Forging, (refer to UNS designations S30200 and S31600)ASTM A 580/A 580M Standard Specification for Stainless Steel Wi
10、re, (refer to UNS designations S30200 and S31600)AMS 5636 Steel, Corrosion Resistant, Bars and Wire 18Cr 9.0Ni (SAE 30302) Solution Heat Treated andCold Drawn, 100 ksi (689 MPa) Tensile Strength (UNS S30200)AMS 5637 Steel, Corrosion Resistant, Bars and Wire 18Cr 9.0Ni (SAE 30302) Solution Heat Treat
11、ed and Cold Drawn 125 ksi (862 MPa) Tensile Strength (UNS S30200)AMS 5688 Steel, Corrosion Resistant, Wire 18Cr 9.0Ni (SAE 30302) Spring Temper (UNS S30200)AMS 5866 Steel, Corrosion Resistant, Flat Wire 18Cr 9.0Ni, (SAE 30302) Spring Temper (UNS S30200)AMS 5690 Steel, Corrosion and Heat Resistant, W
12、ire 17Cr 12Ni 2.5Mo (SAE 30316) Solution Heat Treated(UNS S31600)Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-S-7720B Page 2 of 8NOTICEThe original issue of this document was been taken di
13、rectly from U.S. Military Specification MIL-S-7720A, Amendment 2, and contained only minor editorial and format changes required to bring it into conformance with the publishing requirements of SAE technical standards.The original Military Specification was adopted as an SAE standard under the provi
14、sions of the SAE Technical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards. TSB rules provide for (a) the publication of portions of unrevised government specifications and standards without consensus voting at the S
15、AE Committee level, (b) the use of the existing government specification or standard format, and (c) the exclusion of any qualified product list (QPL) sections.1. SCOPE:1.1 Scope: This specification covers the requirements for compositions of corrosion-resistant (18-8) steel bars, rods, wire and for
16、ging stock.1.2 Classification:Material shall be furnished in the following compositions and conditions, as specified (see 6.2):Composition: (see Table I)302316Physical Conditions:(A) Heat-treated (annealed)(B) Cold finished(C) Hot rolled or forged onlySurface Conditions:(a) Scale not removed (hot fi
17、nished)(b) Pickled, blast cleaned or otherwise descaled(c) Cold drawn(d) Cold rolled(e) Turned(f) Centerless ground(g) PolishedCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-S-7720B Page 3 o
18、f 82. APPLICABLE DOCUMENTS:The following publications, of the issues in effect on the date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. 2.1 Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 70
19、0 Robbins Avenue, Philadelphia, PA 19111-5094.QQ-S-764 Steel Bar, Corrosion Resisting, Free MachiningFED-STD-151 Metals, Test MethodsFED-STD-183 Continuous Identification Marking of Iron and Steel ProductsMIL-STD-129 Marking for Shipment and StorageMIL-STD-163 Steel Mill Products, Preparation for Sh
20、ipment and Storage2.2 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2241 Tolerances, Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy, Bars and Wire3. REQUIREMENTS: 3.1 Material: The steel shall be manufactured by the electric
21、-furnace process. Sufficient discard shall be taken from each ingot to insure freedom from injurious piping and undue segregation.3.2 Chemical composition: The chemical composition shall conform to the compositions of Table I, as specified (see 6.2).Copyright SAE International Provided by IHS under
22、license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-S-7720B Page 4 of 8TABLE I - CHEMICAL COMPOSITIONDesignationComposition 302 316ElementCompositionLimitsCheckAnalysisTolerance 1/CompositionLimitsCheckAnalysisTolerance 1/Percent Percent Percent
23、 PercentCarbon 0.12 (max) +0.01 0.08 (max) +0.01Manganese 2.0 (max) +0.04 2.0 (max) +0.04Phosphorus 0.04 (max) +0.005 0.04 (max) +0.005Sulfur 0.03 (max) +0.005 0.03 (max) +0.005Chromium 17.0 - 19.0 0.20 16.0 - 18.0 0.20Nickel 8.0 - 10.0 0.15 10.0 - 14.0 0.15Silicon 1.0 (max) +0.05 1.0 (max) +0.05Cop
24、per 2/ 0.50 (max) +0.03 0.50 (max) +0.03Molybdenum - - 1.75 - 3.00 0.101/ Individual determinations may vary from the specified range to the extent indicated in the check analysis column, except that an element in any-single heat shall not vary both above and below the specified range.2/ Analysis fo
25、r copper is ordinarily not required.3.3 Mechanical properties: The mechanical properties shall be as specified by Table II.TABLE II MECHANICAL PROPERTIESDiameter or ThicknessTensileStrength(min)Yield Strength at 0.2 Percent Set or at Extension IndicatedElongationin 2 Inches(min)Reductionof Area(min)
26、302Condition (min)ExtensionUnder LoadInchespsi1/ psiInches per2 Inches Percent Percent(A) All sizes100,000- - 35 50(B) Up to 3/4 incl 125,000 100,000 0.0114 12 35(B) Over 3/4 to 1 115,000 80,000 0.0099 15 35(B) Over 1 to 1-1/4 incl 105,000 65,000 0.0088 25 45(B) Over 1-1/4 to 1-1/2 incl 100,000 50,0
27、00 0.0077 28 45(B) Over 1-1/2 to 3 incl 95,000 45,000 0.0073 30 45(B) Over 3 80,000 35,000 0.0066 30 45(C) All Sizes Mechanical properties not specified.316Condition(B) 3/4 and less 110,000 95,000 15 45(B) Over 3/4 to 1 incl 100,000 80,000 20 45(B) Over 1 to 1-1/4 incl 95,000 65,000 25 45(B) Over 1-
28、1/4 to 1-1/2 90,000 50,000 30 45(B) Over 1-1/2 85,000 40,000 30 451/ Maximum. For materials in physical condition A and surface conditions (c) through (g) incl., or annealed material in straightened and cut lengths, a maximum tensile strength of 125,000 psi is permissible for sizes under 1/4 inch in
29、 thickness and 115,000 psi for sizes 1/4 inch and larger.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-S-7720B Page 5 of 83.4 Condition: Carbides shall be dispersed and shall not form conti
30、nuous networks in the structures of materials in physical conditions A and B. The carbide dispersion need not be ascertained in materials in condition C.3.5 Macrostructure: Visual examination of deep acid etched material shall show no evidence of abnormal segregation, pipes, cracks, seams, or abnorm
31、al change in structure from the surface to the center.3.6 Tolerances: Variations from nominal dimensions shall be within the permissible limits of AMS 2241.3.7 Length: 3.7.1 Exact lengths: When bars of any size are ordered to exact lengths or in lengths expressed as a multiple of a definite unit, th
32、e length tolerances shall be as specified in the contract or purchase order.3.7.2 Mill lengths: When exact or multiple lengths are not ordered, bars will be accepted in mill lengths of 6 to 20 feet, but not more than 10 percent of any order shall be furnished in lengths shorter than 10 feet.3.8 Iden
33、tification of product: When specified or for direct shipment to the Government, each piece shall be identified in accordance with FED. STD. No. 183, and the markings shall include the number of the heat of metal, the composition designator, condition, and designation of this specification.3.9 Materi
34、al smaller than 1/2 inch in diameter or 3/8 inch in width of flat shall be bundled and tagged at each end with an extra tag included in the bundle. The identification markings specified in 3.8 shall be legibly inscribed on each tag.3.10 Workmanship: Material shall be sound, of uniform quality and co
35、ndition, free from pipes, laps, cracks, twists, seams, or other defects detrimental to the performance of parts fabricated from the material.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for inspection: Unless otherwise specified in the contract or purchase order, the supplier is responsible f
36、or the performance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or anyother commercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth in the speci
37、fication where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements.4.2 Classification inspection: Inspection of the steel is classified as quality conformance inspection (see 4.3 through 4.8).Copyright SAE International Provided by IHS under licen
38、se with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-S-7720B Page 6 of 84.3 Examinations: 4.3.1 Sampling for Examination of Dimensions, Finish, Workmanship, Packaging, and Identification Marking: Units of product shall be randomly selected in accordan
39、ce with Table III to represent each lot of material of one heat, the same nominal dimensions, and offered for acceptance at one time.TABLE III SAMPLING FOR EXAMINATION OF PRODUCTLot Size Sample Size Acceptance No.1 to 110 5 0111 to 500 7 0501 to 800 10 0801 to 1200 15 0Over 1200 25 04.3.2 Examinatio
40、n of Preparation for Delivery: Preparation for delivery shall be examined for conformance to Section 5.4.4 Chemical Analysis: 4.4.1 Sampling: When products are identified as specified in 3.9, and the heats represented have been analyzed by the manufacturer and are in conformance with specified compo
41、sition limits, the manufacturers ladle analysis is acceptable.4.4.2 Test method: Chemical analysis shall be made in accordance with standard wet chemical methods, spectrochemical, or other analytical methods of Fed. Test Method Std. No. 151. In the event of dispute, analysis shall be by wet chemical
42、 methods.4.5 Tensile test: (Not applicable to materials in physical condition C.)4.5.1 Sampling: One or more tensile-test samples shall be selected from bars or wire produced under the same processing conditions, from the same heat, of the same physical condition, of the same size, essentially unifo
43、rm in all respects, and submitted for acceptance at one time.4.5.2 Test method: Specimens shall be tested in accordance with method 211.1 of Fed. Test Method Std. No. 151.4.6 Metallographic structure: 4.6.1 Sampling: One sample shall be selected to represent products from one heat, of the same shape
44、, nominal dimensions, of the same heat treatment, and presented for acceptance at one time.4.6.2 Microstructure: (Not applicable to materials in physical condition C.) A cross-section of convenient size shall be polished and etched for examination at 300/600 diameters magnification with particular a
45、ttention paid to the carbide structure for condition 3.4.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-S-7720B Page 7 of 84.6.3 Macrostructure: A face representing an entire cross-section o
46、f bar, wire or billet shall be ground or otherwise suitably prepared to a suitable smooth, flat surface. The specimen shall be prepared in accordance with method 321.1 of Fed. Test Method Std. No. 151 to determine conformity to 3.5.4.7 Additional testing: The frequency of sampling specified above is
47、 based on the assumption that the material is produced from ingots from the same heat and is essentially homogeneous in all respects. If the material is taken from stock and is not identifiable as to heat and method of manufacture, or if the identity of any portion of the shipment is obscure in any
48、respect, additional samples and tests for each lot and size, shall be required to determine conformance of all portions of the shipment to this specification.4.8 Rejection and retest: Failure of a specimen to meet the test requirements shall be cause for rejection of the lot. At the discretion of the procuring activity, retest will be permitted. A retest sample of five specimens shall be tested to replace each failed specimen of the original sample. If one of the retest specimens fail, the lot shall be rejected with no further retesting permitted.5. PREPARA
