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 2013 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/AMS4293 AEROSPACE MATERIAL SPECIFICATION AMS4293 Issued 2003-07 Reaffirmed 2013-1
5、2 Aluminum Alloy Extrusions 7.9Zn - 1.6Cu - 2.2Mg - 0.16Cr (7249-T76511) Solution Heat Treated, Stress-Relieved, Straightened, and Overaged RATIONALE AMS4293 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE: 1.1 Form: This specification covers an aluminum alloy procured i
6、n the form of extruded bars, rods, wire, profiles (shapes) and tubing. 1.2 Application: These extrusions have been used typically for structural applications requiring a combination of high tensile strength and good corrosion resistance where intergranular attack is unacceptable, but usage is not li
7、mited to such applications. 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 spe
8、cified. When the referenced document has been canceled and no superseding document has been specified, the last published issue of that document shall apply. 2.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org. AMS 2355 Quality Assurance Samplin
9、g and Testing, Aluminum Alloys and Magnesium Alloys, Wrought Products, Except Forging Stock, and Rolled, Forged, or Flash Welded Rings MAM 2355 Quality Assurance Sampling and Testing, Aluminum Alloys and Magnesium Alloys, Wrought Products, Except Forging Stock, and Rolled, Forged, or Flash Welded Ri
10、ngs, Metric (SI) Units AMS 2772 Heat Treatment of Aluminum Alloy Raw Materials SAE INTERNATIONAL AMS4293 Page 2 of 6 2.2 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 or www.astm.org. ASTM B 557 Tensile Testing Wrought and Cast Aluminum- and Magnesiu
11、m-Alloy Products ASTM B 594 Ultrasonic Inspection of Aluminum-Alloy Wrought Products for Aerospace Applications ASTM B 660 Packaging/Packing of Aluminum and Magnesium Products ASTM B 666/B 666M Identification Marking of Aluminum and Magnesium Products ASTM E 1004 Determining Electrical Conductivity
12、Using the Electromagnetic (Eddy Current) Method ASTM G 34 Exfoliation Corrosion Susceptibility in 2XXX and 7XXX Series Aluminum Alloys (EXCO Test) ASTM G 47 Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX /Aluminum Alloy Products 2.3 ANSI Publications: Available from ANSI, 2
13、5 West 43rdStreet, New York, NY 10036 or www.ansi.org. ANSI H35.2 Dimensional Tolerances for Aluminum Mill Products ANSI H35.2M Dimensional Tolerances for Aluminum Mill Products (Metric) 3. TECHNICAL REQUIRMENTS: 3.1 Composition: Shall conform to the percentages by weight shown in Table 1, determine
14、d in accordance with AMS 2355 or MAM 2355. TABLE 1 Composition Element min max Silicon - 0.10 Iron - 0.12 Copper 1.3 1.9 Manganese - 0.10 Magnesium 2.0 2.4 Chromium 0.12 0.18 Zinc 7.5 8.2 Titanium - 0.06 Other Elements, each - 0.05 Other Elements, total - 0.15 Aluminum remainder SAE INTERNATIONAL AM
15、S4293 Page 3 of 6 3.2 Condition: Extrusions shall be solution heat-treated, stress relieved by stretching after solution treatment to produce a nominal permanent set of 1.5 percent, but not less than 1 percent or more than 3 percent, and overaged to the T76511 temper. 3.2.1 Extrusions may receive mi
16、nor straightening, after stretching, of an amount necessary to meet tolerance requirements of 3.6. 3.2.2 Extrusions shall be supplied with an as-extruded surface finish. Light polishing to remove minor surface imperfections is permissible provided such imperfections can be removed within specified d
17、imensional tolerances. 3.3 Heat Treatment: Shall be performed in accordance with the requirements of AMS 2772, except as follows: 3.3.1 Solution Heat Treatment: Heat to 870 to 890 F (466 to 477 C), hold at heat for a time commensurate with product thickness and rapidly cool in a suitable quenching m
18、edium. 3.3.2 Overaging Heat Treatment: Overaging shall be performed at the specific times and temperatures necessary to meet the requirements of 3.4 (See 8.2). 3.4 Properties: Extrusions shall conform to the following requirements, determined on the mill product in accordance with AMS 2355 or MAM 23
19、55: 3.4.1 Longitudinal and long transverse tensile properties of extrusions, with a maximum cross-sectional area of 32 square inches (206 cm2), shall be as specified in Table 2. TABLE 2A Minimum Tensile Properties, Inch/Pound Units Nominal Diameter or Least Thickness (bars, rods, wire, profiles) or
20、Nominal Wall Thickness (tubing) Inches Specimen Orientation Tensile Strength ksi Yield Strength At 0.2% Offset ksi Elongation in 2 Inches or 4D % Longitudinal 83.0 76.0 7 1.499 Long-Transverse(1)78.0 72.0 7 (1)Long transverse tensile testing is not required if either the extrusion width is less than
21、 3.0 inches or the extrusion profile (shape) makes it impossible to excise an appropriate sub-size specimen as specified in ASTM B 557. SAE INTERNATIONAL AMS4293 Page 4 of 6 TABLE 2B Minimum Tensile Properties, SI Units Nominal Diameter or Least Thickness (bars, rods, wire, profiles) or Nominal Wall
22、 Thickness (tubing) Millimeters Specimen Orientation Tensile Strength MPa Yield Strength At 0.2% Offset MPa Elongation in 50 mm % Longitudinal 572 524 7 38.07 Long-Transverse(1)538 496 7 (1)Long transverse tensile testing is not required if either the extrusion width is less than 76 mm or the extrus
23、ion profile (shape) makes it impossible to excise an appropriate sub-size specimen as specified in ASTM B 557. 3.4.2 Corrosion Resistance: 3.4.2.1 Exfoliation-Corrosion Resistance: Specimens, cut from extrusions, shall not exhibit exfoliation corrosion greater than that exhibited by Photo B, Figure
24、2 of ASTM G 34 at a T/10 plane for section thickness up to 0.749 inches (19.02 mm) and at T/2 and T/10 planes for section thickness greater than 0.750 inches (19.05 mm). 3.4.2.2 Stress-Corrosion Cracking: When specified, specimens cut from extrusions 0.750 inches (19.04 mm) and over in diameter or t
25、hickness shall show no evidence of stress corrosion cracking when stressed in the short-transverse direction (perpendicular to grain flow) to 25.0 ksi (172 MPa) for a minimum 20 day exposure, as determined in accordance with ASTM G 47. 3.4.3 Electrical Conductivity (EC): Electrical conductivity shal
26、l be equal to or greater than 37.0% IACS (International Annealed Copper Standard) when performed in accordance with ASTM E 1004. 3.4.3.1 Extrusions with electrical conductivities less than 37% IACS may receive additional precipitation heat treatment. If, upon completion of such treatment, they meet
27、the property requirements as specified in 3.4, they shall be acceptable. 3.5 Quality: Product, as received by the purchaser, shall be uniform in quality and condition, sound, and free from foreign material and from imperfections detrimental to the usage of the product. Any internal defects found dur
28、ing the customers manufacturing process are subject to rejection. 3.5.1 When specified, bars, rods, wire, and profiles (shapes) over 0.500 inches (12.70 mm) in thickness or diameter shall be subjected to ultrasonic inspection in accordance with ASTM B 594. Extrusions, 0.500 to 1.499 inches (12.70 to
29、 38.07 mm), inclusive, shall meet ultrasonic Class B. SAE INTERNATIONAL AMS4293 Page 5 of 6 3.6 Tolerances: Shall conform to all applicable requirements of ANSI H35.2 or ANSI H35.2M. 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of extrusions shall supply all samples
30、 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 testing deemed necessary to ensure that the extrusions conform to specified requirements. 4.2 Classification of Tests: 4.2.1 Acceptance Tests:
31、 Composition (3.1), tensile testing (3.4.1), electrical conductivity (3.4.3), tolerances (3.6) and ultrasonic inspection (3.5.1) (when specified) are acceptance tests and, except for composition, shall be performed on each lot. 4.2.2 Periodic Tests: Exfoliation-corrosion resistance (3.4.2.1) and str
32、ess-corrosion cracking resistance (3.4.2.2) are periodic tests and shall be performed at a frequency selected by the vendor unless the purchaser specifies frequency of testing. 4.3 Sampling and Testing: Shall be in accordance with AMS 2355 or MAM 2355. 4.4 Reports: The vendor of extrusions shall fur
33、nish with each shipment a report stating that the extrusions conform to the chemical composition, ultrasonic inspection (when specified), and tolerances and showing the numerical results of tests on each inspection lot to determine conformance to the other acceptance test requirements, including per
34、iodic testing results when performed. This report shall include the purchase order number, mill producer, inspection lot number, AMS 4293, size or profile identification number, and quantity. 4.5 Resampling and Retesting: Shall be in accordance with AMS 2355 or MAM 2355. 5. PREPARATION FOR DELIVERY:
35、 5.1 Identification: Shall be in accordance with ASTM B 666/B 666M. SAE INTERNATIONAL AMS4293 Page 6 of 6 5.2 Packaging and Preservation: Extrusions shall be prepared for shipment in accordance with ASTM B 660 and in compliance with applicable rules and regulations pertaining to the handling, packag
36、ing, and transportation of the product to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGEMENT: A vendor shall mention this specification number in all quotations and when acknowledging purchase orders. 7. REJECTIONS: Extrusions not conforming to this specification, or to modifications au
37、thorized by purchaser, 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 this specification. An (R) symbol to the left
38、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 Actual overaging heat treatments may be proprietary. 8.3 Terms used in AM
39、S are clarified in ARP 1917. 8.4 Dimensions and properties in inch/pound units and Fahrenheit temperatures are primary; dimensions and properties in SI units and Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.5 Purchase documents should specify not less than the following: AMS 4293 Form and size or profile identification number of extrusions desired Quantity of extrusions desired. PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “D”
