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 2012 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/AMSQQA250A AEROSPACE MATERIAL SPECIFICATION AMS-QQ-A-250 REV. A Issued 1997-08 Re
5、vised 2004-08 Reaffirmed 2012-02 Superseding AMS-QQ-A-250 Aluminum and Aluminum Alloy, Plate and Sheet General Specification for RATIONALE AMS-QQ-A-250A has been reaffirmed to comply with the SAE five-year review policy. NOTICEThis document is intended to replace Federal Specification QQ-A-250F. The
6、 original issue of AMS-QQ-A-250 was taken directly from Federal Specification QQ-A-250, and contained only minor editorial and format changes required to bring it into conformance with the publishing requirements of SAE technical standards. This revision B changes the heat treatment specification MI
7、L-H-6088 (cancelled) to AMS 2772 (the superseding document) to ensure that the vital heat treat parameters used for heat-treat-response-test samples conform to parameters used for heat treatment of parts (See 6.8).The original Federal Specification was adopted as an SAE standard under the provisions
8、 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 Co
9、mmittee level, (b) the use of the existing government specification or standard format, and (c) the exclusion of any qualified product list (QPL) sections.SAE AMS-QQ-A-250A Page 2 of 10 1. SCOPE AND CLASSIFICATION:1.1 Scope: This specification covers the general requirements for aluminum and aluminu
10、m alloy plate and sheet. Specific requirements for plate and sheet of a particular alloy are covered by the applicable detail specification (See 6.3).1.2 Classification: 1.2.1 Tempers: The plate and sheet are classified in tempers as specified in the detail specification. Definitions of tempers are
11、specified in American National Standards ANSI H35.1.2. APPLICABLE DOCUMENTS: The following publications, of the issues in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein:2.1 SAE Publications: Available from SAE, 400 Comm
12、onwealth Drive, Warrendale, PA 15096-0001 or www.sae.org.AMS 2772 Heat Treatment of Aluminum Alloy Raw MaterialsAMS-STD-184 Identification Marking of Aluminum, Magnesium, and Titanium2.2 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue,
13、 Philadelphia, PA 19111-5094 or www.dsp.dla.mil.AMS-STD-2154 Inspection, Ultrasonic, Wrought Metals, Process forFED-STD-123 Marking for Shipment (Civil Agencies)FED-STD-151 Metals, Test Methods2.3 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 194
14、28-2959 or www.astm.org.ASTM B 557 Tension Testing Wrought and Cast Aluminum and Magnesium Alloy ProductsASTM B 660 Packaging/Packing of Aluminum and Magnesium ProductsASTM D 1193 Reagent WaterASTM E 172 Emission Spectrochemical Analysis, Describing and Specifying the Excitation SourceASTM E 290 Sem
15、i-Guided Bend Test for Ductility of Metallic MaterialsSAE AMS-QQ-A-250A Page 3 of 10 2.3 (Continued):ASTM E 1004 Electrical Conductivity, Determining, Using the Electromagnetic (Eddy Current) MethodASTM E 1282 Quantitative Analysis Methods for Metals, Ores, and Related MaterialsASTM G 34 Exfoliation
16、 Corrosion Susceptibility in 2XXX and 7XXX Series Aluminum Alloys (EXCO Test)ASTM G 38 Making and Using C-Ring Stress Corrosion Test SpecimensASTM G 47 Testing Susceptibility to Stress-Corrosion Cracking of High Strength Aluminum Alloy Products2.4 ANSI Publications: Available from American National
17、Standards Institute, Inc., 25 West 43rd Street, New York, NY 10036 or www.ansi.org.ANSI H35.1 Alloy and Temper Designation System for AluminumANSI H35.2 Dimensional Tolerances for Aluminum Mill Products3. REQUIREMENTS: 3.1 Specification Sheets: The individual item requirements shall be as specified
18、herein and in accordance with the applicable specification sheets.3.1.1 Chemical Composition: The chemical composition shall be as specified in the detailed specification.3.2 Mechanical Properties: Mechanical properties shall be as specified in the detailed specification.3.3 Permissible Variations:
19、Unless otherwise specified, the tolerances shall not exceed those specified in ANSI H35.2.3.4 Marking for Identification: Plate and sheet shall be marked in accordance with AMS-STD-184 and the detailed specification, as required (See 6.3).3.5 Requirements for Sizes Not Specifically Covered: Mechanic
20、al properties for thicknesses not covered by the detailed specification and tolerances for sizes and thicknesses not covered in ANSI H35.2 shall be as specified in the contract or purchase order (See 6.2).SAE AMS-QQ-A-250A Page 4 of 10 3.6 Electrical Conductivity: When specified in the detailed spec
21、ification, requirements for electrical conductivity shall be as specified when tested in accordance with 4.7.3.7 Exfoliation Corrosion: When specified in the detailed specification, plate and sheet processed to meet the applicable mechanical property and electrical conductivity requirements, shall s
22、how a level of exfoliation corrosion less than that illustrated in photograph B, Figure 2 of ASTM G34 when tested as specified in 4.8, unless otherwise specified in the detailed specification or purchase order. The supplier shall maintain records of all lots so tested.3.8 Stress-Corrosion Cracking:
23、When specified in the detailed specification, plate 0.750 inches or more in thickness, processed to meet the applicable mechanical property and electrical conductivity requirements specified in the detailed specification, shall show no evidence of stress corrosion cracking when tested in accordance
24、with 4.9. This test shall be performed at the stress level specified in the detailed specification. The supplier shall maintain records of the performance of all lots so tested.3.9 Heat Treatment: Unless otherwise specified in the detailed specification, contract, or purchase order, heat-treatment f
25、or the applicable tempers designated in the detailed specification shall be in accordance with the applicable requirements of AMS 2772.3.10 Internal Defects: When specified in the detailed specification, plate shall be inspected ultrasonically for internal defects (See 4.3.2).3.11 Cladding and Cladd
26、ing Thickness: Cladding and cladding thickness shall be as specified in the detailed specification (See 4.6).3.12 Workmanship: The plate and sheet shall be uniform in quality and condition; clean, sound, smooth, commercially flat, and free from buckles, blisters, and other injurious defects within t
27、he limits consistent with the best commercial practice. Discoloration due to thermal treatment shall not be cause for rejection.SAE AMS-QQ-A-250A Page 5 of 10 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: Unless otherwise specified in the contract or purchase order, the contrac
28、tor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein. Purchaser r
29、eserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to ensure that supplies and services conform to prescribed requirements.4.2 Sampling: 4.2.1 Inspection Lot: An inspection lot shall be as follows:4.2.1.1 Heat-Treated Lot: F
30、or heat-treated tempers, an inspection lot shall consist of an identifiable quantity of material of the same mill form, alloy, temper, and thickness traceable to a heat-treated lot or lots, and subjected to inspection at one time.4.2.1.2 Non-Heat-Treated Lot: For non-heat-treated tempers, an inspect
31、ion lot shall consist of an identifiable quantity of material of the same mill form, alloy, temper and thickness subjected to inspection at one time.4.2.2 Sampling for Chemical Analysis: 4.2.2.1 Ingot Analysis: At least one sample shall be taken from each group of ingots of the same alloy poured sim
32、ultaneously from the same source of molten metal by the producer and analyzed to determine conformance to 3.1. Ingots not conforming to the requirements of this specification shall be rejected. Complete ingot analysis records shall be available at the producers plant to the procuring activity.4.2.2.
33、2 Finish Product Analysis: When compliance with 4.2.2.1 cannot be established, samples shall be selected as follows: One sample shall be taken for each 2000 pounds or less of sheet and for each 4,000 pounds or less of plate comprising a lot, except that not more than one sample shall be taken from t
34、he same plate or sheet, when more than one piece is available.4.2.3 Sampling for Mechanical Tests: 4.2.3.1 Sampling of Coiled Sheet and Flat Sheet: One sample shall be taken from each end of each parent coil (See 6.4), but no more than one sample per 2000 pounds, or part thereof, in a lot shall be r
35、equired.4.2.3.2 Sampling of Plate: One sample shall be taken from each end of each parent plate (See 6.4), but no more than one sample per 4000 pounds, or part thereof, in a lot shall be required.SAE AMS-QQ-A-250A Page 6 of 10 4.2.4 Sampling for Visual and Dimensional Examination: Each plate and she
36、et shall be examined to determine conformance to this specification with respect to workmanship and identification marking. Examinations for dimensions shall be made to ensure conformance to the tolerances specified. On approval of the procuring activity, the supplier may use a system of statistical
37、 quality control for dimensional, marking, and workmanship examination.4.2.5 Sampling for Electrical Conductivity Tests: Sampling shall be in accordance with 4.2.3.4.2.6 Sampling for Exfoliation Corrosion and Stress Corrosion Tests: When thickness permits (See 3.8), two samples shall be taken for ea
38、ch 4,000 pounds or less of the first three production lots of each of the applicable tempers for each size range listed in the table of minimum mechanical properties in the detailed specification. Thereafter, surveillance testing shall be performed on at least one sample per month of the applicable
39、tempers for each size range listed in the table of minimum mechanical properties of the detailed specification produced during the month, unless otherwise specified in the detailed specification or purchase order.4.3 Examination: 4.3.1 Visual and Dimensional Examination: Each sample plate or sheet,
40、selected in accordance with 4.2.4, shall be visually examined and measured to verify conformance with this specification.4.3.2 Ultrasonic Inspection: When specified in the detailed specification, plate shall be inspected for internal defects in accordance with MIL-STD-2154. Acceptance standards shal
41、l be as specified in the detailed specification.4.4 Test Procedures: 4.4.1 Chemical Analysis: Chemical analysis shall be made by the wet chemical method in accordance with ASTM E 1282 or by the spectrochemical method in accordance with ASTM E 172. In case of dispute, the chemical analysis by the wet
42、 chemical method of ASTM E 1282 shall be the basis for acceptance.4.4.2 Mechanical Testing: 4.4.2.1 Types of Test Specimens: Tension specimens shall conform to ASTM B 557. For material under 1/2 inch in thickness, a standard rectangular tension specimen with 2-inch gage length shall be used. For mat
43、erial 1/2 to 3/4 inch in thickness and for tension specimens taken in the short-transverse direction, a standard 0.500 inch diameter round tension specimen, or small size round specimen proportional to the standard 0.500 inch diameter round tension specimen having a nominal diameter of 0.350 inch or
44、 0.250 inch, shall be used. For material 3/4 inch and greater in thickness, a standard 0.500 inch diameter round tension specimen shall be used. Sheet less than 3/4 inch in width shall be tested in full section.SAE AMS-QQ-A-250A Page 7 of 10 4.4.2.2 Locations of Test Specimens: Tension specimens sha
45、ll be taken from the plate or sheet parallel to or perpendicular to the direction of final rolling as specified in the detailed specification. From plate, in thicknesses 0.5 to 1.5 inches inclusive, tension specimens shall be taken with the axis midway between the two plate surfaces; from plate in t
46、hicknesses greater than 1.5 inches, the axis of the tension specimen shall be three-fourths of the distance from one surface to the other.4.4.2.2.1 Tensile Strength: Tensile strength shall be determined in accordance with ASTM B 557.4.4.2.2.2 Yield Strength: The yield strength shall be determined in
47、 accordance with ASTM B 557.4.5 Bend Test: When specified in the detailed specification, specimens tested in accordance with ASTM E 290 shall be capable of being bent either parallel with, or transverse to the direction of final rolling, at room temperature through 180 degrees around a mandrel havin
48、g a diameter equal to N times the nominal thickness of the sheet or plate. If material is too narrow to bend parallel to the direction of rolling, bending should be done transverse to the direction of rolling. Specimens shall be bent by either pressure or blows. The values for N shall be as specifie
49、d in the detailed specification. For material alclad one side, the bare surface shall be on the outside of the bend.4.6 Cladding Thickness of Alclad Sheet and Plate: When specified in the detailed specification, if a question arises concerning the uniformity of cladding of the finished sheet or plate, not fewer than three transverse samples approximately 3/4 inch in length, shall be mounted to expose an edge perpendicular to the plane of the s
