SAE-AMS-QQ-A-225-9-1997-R2007.pdf

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: custsvcsae.org SAE WEB ADDRESS:http:/www.sae.org Aluminum Alloy 7075, Bar, Rod, Wire, and Special Shapes; Rolled, Drawn, or Cold Finished A97075 RATIONALE This document has been reaffirmed to comply with the SAE 5-year Review policy. NOTICE This document has been taken directly from Federal Specification QQ-A-225/9E and contains only minor editorial and format changes required to bring it into conformance with the publishing requirements of SAE technical standards. The original Federal Specification was adopted as an SAE standard under the provisions 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 SAE Committee level, (b) the use of the existing government specification and standard format, and (c) the exclusion of any qualified product list (QPL) sections. The complete requirements for procuring 7075 aluminum alloy bar, rod, wire, and special shapes described herein shall consist of this document and the latest issue of AMS-QQ-A-225. AEROSPACE MATERIAL SPECIFICATION AMS-QQ-A-225/9 IssuedJUL 1997 ReaffirmedAPR 2007 -,-,- AMS-QQ-A-225/9SAEAMS-QQ-A-225/9 - 2 - 1.SCOPE AND CLASSIFICATION: 1.1Scope: This specification covers the specific requirements for 7075 aluminum alloy bar, rod, wire, and special shapes produced by rolling, drawing, or cold finishing. 1.2Classification: 1.2.1Tempers: Bar, rod, wire, and special shapes are of the following tempers, as specified (See 6.2): O, T6, T62, T651, T73, or T7351 temper. Definitions of these tempers are specified in AMS-QQ-A-225. 2.APPLICABLE DOCUMENTS: See AMS-QQ-A-225. 3.REQUIREMENTS: 3.1Chemical Composition: The chemical composition shall conform to the requirements specified in Table I. Chemical Composition 1/ Element Percent MinimumMaximum Zinc5.16.1 Magnesium2.12.9 Copper1.22.0 Chromium0.180.28 Iron-0.50 Silicon-0.40 Manganese-0.30 Titanium-0.20 Other Elements, each-0.05 Other Elements, total-0.15 AluminumRemainder 1/ Analysis shall routinely be made only for the elements specifically mentioned in Table I. If, however, the presence of other elements is indicated or suspected in the course of routine analysis, further analysis shall be made to determine conformance to the limits specified for other elements. AMS-QQ-A-225/9SAEAMS-QQ-A-225/9 - 3 - 3.2Mechanical Properties: 3.2.1Mechanical Properties of Material as Supplied: The mechanical properties in the direction of working shall conform to the requirements of Table II for the temper specified. TABLE I. Mechanical Properties (See 6.4) Temper Diameter or Thickness Inches Tensile Strength minimum ksi Yield Strength at 0.2 percent Offset or at Extension Indicated 6/ Elongation in 2 in. or 4 times diameter 6/ minimum, percent Minimum, ksi Extension under load, inch/inch OUp to 8.000, incl 40.0 2/12.0-10 T6 and T62 4/ Up to 4.000, incl 3/ 77.066.00.0084 7 T651 1/0.500 to 4.000, incl 3/ 77.066.00.0084 7 T73 5/Up to 3.000, incl 3/ 68.056.00.007410 T7351 1/ 5/ 0.500 to 3.000, incl 3/ 68.056.00.007410 1/ Tempers T651 and T7351 are available only in rod, bar and shapes 2/ Maximum 3/ For rounds (rods), maximum diameter is 3 or 4 inches, whichever is applicable; for square, hexagonal, or octagonal bar, maximum thickness is 3 or 3-1/2 inches, whichever is applicable; for rectangular bar, maximum thickness is 3 inches with corresponding maximum width of 6 inches; for rectangular bar less than 3 inches in thickness, maximum width of 10 inches. 4/ Material in the T62 temper is not available from the materials producers 5/ Definition of T73 and T7351 tempers: The T73 temper applies to material which has been solution heat-treated and stabilized to develop the required mechanical properties and resistance to stress-corrosion cracking. The T7351 temper applies to material which has been solution heat-treated, stress-relieved by stretching to produce a permanent set of 1-1/2 percent nominal, but not less than 1 nor more than 3 percent, and stabilized to develop the required mechanical properties and resistance to stress-corrosion cracking. 6/ See AMS-QQ-A-225 for yield strength and elongation requirement exceptions AMS-QQ-A-225/9SAEAMS-QQ-A-225/9 - 4 - 3.2.2Mechanical Properties After Heat Treatment: In addition to conforming to the requirements of 3.2.1, the mechanical properties in the direction of working of material ordered in the annealed (O) temper, and without subsequent cold-working or forming operations, and subsequently solution heat-treated and artificially aged shall conform to the requirements specified in Table II for the T6, T62, and T73 tempers. Material as received in the T6, T651, T73, and T7351 tempers shall, after proper re-solution heat treatment and aging, be capable of conforming to the requirements specified in Table II for the T6, T62, and T73 tempers. Material in the T6, T62, and T651 tempers shall after proper aging be capable of conforming to the requirements specified in Table II for the T73 or T7351 tempers, as applicable. See AMS-QQ-A-225 for the solution and aging treatments. 3.3Finish: Unless otherwise specified in the contract or purchase order (See 6.2), rod up to and including 3 inches in diameter, and bar up to and including 2 inches thick (with maximum width for rectangles of 4 inches) shall be processed to size by cold finishing. 3.4Stress-Corrosion Cracking (SCC): 3.4.1Resistance to SCC: Material in the T73 or T7351 tempers shall be capable of exhibiting no evidence of stress-corrosion cracking when subjected to the test specified in 4.2. The supplier shall maintain records of the performance of all lots so tested. 3.4.2Acceptance Criteria: Susceptibility to stress-corrosion cracking for each lot of 7075-T73 and T7351 material shall be established by testing the previously selected tensile specimens to the following criteria: a.Determine electrical conductivity and tensile properties b.If the conductivity is below 38.0 percent International Annealed Copper Standard (IACS), the material is considered unsatisfactory and must be reprocessed, regardless of property level c.If the conductivity is 40 percent IACS or higher and tensile properties meet the minimum values specified herein, the material is considered to be satisfactory d.If conductivity is 38 to 40 percent IACS, if tensile properties meet the minimum limits specified herein, and if the yield strength does not exceed the specified minimum by more than 11.9 ksi, the material is considered to be satisfactory e.If conductivity is below 40 percent IACS and the yield strength exceeds the specified minimum value by 12.0 ksi or more, the material is considered suspect f.When material is considered suspect, it may be reprocessed or a sample of the material may be heat-treated for not less than 30 minutes at 870°F ± 10, quenched in cold water. Conductivity shall then be measured within 15 minutes after quenching. If the difference between this measurement and the original measurement on the T73 or T7351 material is 6 percentage points or more, the T73 or T7351 temper material is satisfactory. If the difference is less than 6 percentage points, the T73 or T7351 material must be reprocessed AMS-QQ-A-225/9SAEAMS-QQ-A-225/9 - 5 - 3.5Marking: In addition to marking required in AMS-QQ-A-225, material in the T6, T651, T73 and T7351 tempers shall be identified by a lot number marked in at least one location on each piece (See 6.2). 4.QUALITY ASSURANCE PROVISIONS: See AMS-QQ-A-225 and the following: 4.1Number of Tests After Heat Treatment: From material in the annealed (O) temper, an additional number of specimens equal to those required by AMS-QQ-A-225 shall be taken and tested after solution heat treatment and artificial aging to determine compliance with 3.2.2. 4.2Stress-Corrosion Cracking Test: Specimens of 7075-T73 and T7351 alloy shall be selected in a manner that will permit application of the specified tensile stress in the short-transverse grain direction (See 4.2.4). The specimens shall be subjected to the following stress-corrosion test: 4.2.1Thirty days exposure. 4.2.2Stressed in the short-transverse direction with respect to grain flow and held at a constant strain. The stress level shall be 75 percent of the specified longitudinal yield strength. 4.2.3The stressed specimens shall be exposed to a solution of 3.5 percent NaCl conforming to the purity and pH requirements of ASTM B 117, at room temperature, by alternate immersion. The exposure cycle shall consist of 10 minutes immersion in the solution and 50 minutes out of the solution. 4.2.4For material thicknesses under 0.700 inch, the specimen tested shall be a tension specimen selected so that the applied stress is, if possible, parallel in direction to the smallest dimension of the product which is over 0.700 inch. 5.PREPARATION FOR DELIVERY: See AMS-QQ-A-225. 6.NOTES: 6.1Intended Use: This alloy is intended for use where high strength and good corrosion resistance are required. -,-,- AMS-QQ-A-225/9SAEAMS-QQ-A-225/9 - 6 - 6.2Ordering Data: Purchasers should select the preferred options permitted herein and include the following information in procurement documents: Title, number, and date of this specification Form, quantity, and temper required (See 1.2.1) Dimensions required Mechanical properties and dimensional tolerance requirements for sizes not specifically covered Finish requirements (See 3.3) Whether there are special end use requirements For military agencies: Selection of applicable levels of preservation, packaging, and packing required. Also specify marking requirements (See AMS-QQ-A-225) For civil agencies: Specify packing level, level A, or commercial. Also specify marking requirements (See AMS-QQ-A-225) 6.3Product produced and marked to the requirements of AMS-QQ-A-225/9 also meets the requirements of QQ-A-225/9E. Product produced and marked to the requirements of QQ-A-225/9E also meets the requirements of AMS-QQ-A-225/9. 6.4Properties listed in 3.2.1 are exactly the same as QQ-A-225/9, Revision E. These properties have not been substantiated in accordance with the AMS Manual for Preparation of Aerospace Specifications. PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “D“ -,-,-