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 2011 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:/www.sae.org/technical/standards/AMS4251A AEROSPACE MATERIAL SPECIFICATION AMS 4251 REV. A Issued 1989-04 Revised
5、2006-03 Reaffirmed 2011-11 Superseding AMS 4251 Aluminum Alloy Sheet 2.7Cu - 2.2Li - 0.12Zr (2090-T83) Solution Heat Treated, Cold Worked, and Precipitation Heat Treated (Composition similar to UNS A92090) RATIONALE This document has been reaffirmed to comply with the SAE five-year review policy. 1.
6、 SCOPE: 1.1 Form: This specification covers an aluminum alloy in the form of sheet. 1.2 Application: Primarily for applications requiring the strength of AMS 4045 and 7.8% lower nominal density. 2. APPLICABLE DOCUMENTS: The issue of the following documents in effect on the date of the purchase order
7、 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
8、that document shall apply. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 4251A Page 2 of 6 2.1 SAE Publications: Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada)
9、or 724-776-4970 (outside USA), www.sae.org. AMS 2355 Quality Assurance Sampling and Testing of Aluminum Alloys and Magnesium Alloys, Wrought Products (Except Forging Stock) and Flash Welded Rings AMS 2772 Heat Treatment of Aluminum Alloy Raw Materials AS1990 Aluminum Alloy Tempers 2.2 ASTM Publicati
10、ons: 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 B 660 Packaging/Packing of Aluminum and Magnesium Products ASTM B 666 Identification and Marking of Aluminum and Magnesium Products ASTM G 34 Exfoliat
11、ion Corrosion Susceptibility in 2XXX and 7XXX Series Aluminum Alloys (EXCO Test) ASTM G 85 Modified Salt Spray (Fog) Testing 2.3 ANSI Publications: Available from American National Standards Institute, 25 West 43rd Street, New York, NY 10036, Tel: 212-642-4900, www.ansi.org. ANSI H35.2 Dimensional T
12、olerances for Aluminum Mill Products ANSI H35.2M Dimensional Tolerances for Aluminum Mill Products (Metric) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 4251A Page 3 of 6 3. TECHNICAL REQUIREMENTS: 3.1 Composition: Shall conform to the fol
13、lowing percentages by weight shown in Table 1, determined in accordance with AMS 2355. TABLE 1 Composition Element min max Silicon - 0.10 Iron - 0.12 Copper 2.4 3.0 Manganese - 0.05 Magnesium - 0.25 Chromium - 0.05 Zinc - 0.10 Titanium - 0.15 Lithium 1.9 2.6 Zirconium 0.08 0.15 Other Elements, each
14、- 0.05 Other Elements, total - 0.15 Aluminum remainder 3.2 Condition: Solution heat treated, cold worked, and precipitation heat treated to the T83 temper, see AS1990. 3.2.1 Heat treatment shall be in accordance with AMS 2772; times and temperatures shall be established by the producer (see 8.4). Pr
15、ovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 4251A Page 4 of 6 3.3 Properties: Shall conform to the following requirements, determined in accordance with AMS 2355 on the mill produced size: 3.3.1 Tensile Properties: Shall be as specified in
16、Table 2. TABLE 2A Nominal Thickness Inches Specimen Orientation Tensile Strength ksi, min Yield Strength at 0.2% Offset ksi, minimum Elongation in 2 Inches %, minimum 0.040 to 0.125, incl Longitudinal Long-Transverse 77.0 73.0 70.0 66.0 3 5 Over 0.125 to 0.249, incl Longitudinal Long-Transverse 75.0
17、 73.0 70.0 66.0 4 5 TABLE 2B (SI) Nominal Thickness Millimetres Specimen Orientation Tensile Strength MPa, minYield Strength at 0.2% Offset MPa, minimum Elongation in 50.8 mm %, minimum 1.02 to 3.18, incl Longitudinal Long-Transverse 531 503 483 455 3 5 Over 3.18 to 6.32, incl Longitudinal Long-Tran
18、sverse 517 503 483 455 4 5 3.3.1.1 Tensile property requirements for sheet under 0.040 inch (1.02 mm) in nominal thickness shall be as agreed upon by purchaser and vendor. 3.3.2 Exfoliation-Corrosion Resistance: Sheet shall not show exfoliation corrosion more severe than rating EB of ASTM G 34 when
19、exposed for two weeks to test conditions of ASTM G 85, using the dry bottom method. 3.4 Quality: Sheet, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the sheet. 3.5 Tolerances: Shall conform
20、to all applicable requirements of ANSI H35.2 or ANSI H35.2M. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 4251A Page 5 of 6 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of sheet shall supply all samples fo
21、r vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the sheet conforms to specified requirements. 4.2 Classification of Tests: 4.2.1 Acceptance Tests: Compos
22、ition (3.1), long- transverse tensile properties (3.3.1) and, when specified, longitudinal tensile properties (3.3.1), and tolerances (3.5) are acceptance tests and, except for composition, shall be performed on each lot. 4.2.2 Periodic Tests: Exfoliation-corrosion resistance (3.3.2) is a periodic t
23、est and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. 4.3 Sampling: Shall be in accordance with AMS 2355. 4.4 Reports: 4.4.1 The vendor of sheet shall furnish with each shipment a report stating that the sheet conforms to the composit
24、ion, showing the results of tests on each inspection lot to determine conformance to the other acceptance test requirements, and stating that the sheet conforms to the other technical requirements of this specification. This report shall include the purchase order number, inspection lot number, AMS
25、4251A, size, quantity. The report shall also identify the producer, the product form, and the mill produced size. 4.5 Resampling and Retesting: Shall be in accordance with AMS 2355. 5. PREPARATION FOR DELIVERY: 5.1 Identification: Shall be in accordance with ASTM B 666/B 666M. 5.2 Protective Treatme
26、nt: Product shall be protected from damage during storage and shipment by a method determined by the vendor, unless specified by purchaser. Examples of typical protective coating include but are not limited to interleaving with paper or oiling of the surface. Provided by IHSNot for ResaleNo reproduc
27、tion or networking permitted without license from IHS-,-,-SAE AMS 4251A Page 6 of 6 5.3 Packaging: The product shall be prepared for shipment in accordance with ASTM B 660 and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the product
28、 to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT: A vendor shall mention this specification number and its revision letter in all quotations and when acknowledging purchaser orders. 7. REJECTIONS: Sheet not conforming to this specification, or to modifications authorized by purchas
29、er, will be subject to rejection. 8. NOTES: 8.1 A change bar (|) 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 a specification. An (R) symbol to the left of the document title
30、indicates a complete revision of the specification, including technical revision. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only. 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Dimensions and properties in inch/pound units an
31、d 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. 8.4 Heat treatment and cold working parameters are proprietary. 8.5 Purchase documents s
32、hould specify not less than the following: AMS 4251A Size of sheet desired Quantity of sheet desired. 8.6 Keywords: Sheet, aluminum alloy, 2090-T83, UNS A92090 PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “D“ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
