1、 AEROSPACE MATERIAL SPECIFICATION Aluminum Alloy, Alclad Sheet 3.8Cu - 1.0Mg - 0.30Mn - 0.60Zn (Alclad 2056-T3) Solution Heat Treated and Cold Worked AMS 4298Issued 1. SCOPE: 1.1 Form: This specification covers an aluminum alloy in the form of sheet clad on both sides. 1.2 Application: These product
2、s have been used typically for formed structural aircraft parts requiring improved resistance to fatigue crack growth and high toughness with strength similar to Alclad 2024-T3, but usage is not limited to such applications. 1.2.1 Certain design and processing procedures may cause these products to
3、become susceptible to stress-corrosion cracking; ARP823 recommends practices to minimize such conditions. 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
4、 to a subsequent revision of a document unless a specific document is specified. When the referenced document has been canceled and no superseding document has been specified, the last published issue of that document shall apply. 2004-07Reaffirmed 2010-05SAE Technical Standards Board Rules provide
5、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.”
6、 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 2010 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system
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8、e.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/AMS4298 Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without lic
9、ense from IHS-,-,-SAE- 2 - AMS 4298 AMS 42982.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org.AMS 2355 Quality Assurance Sampling and Testing, Aluminum Alloys and Magnesium Alloys, Wrought Products, Except Forging Stock, and Rolled, Forged, or
10、 Flash Welded Rings AMS 2772 Heat Treatment of Aluminum Alloy Raw Materials ARP823 Minimizing Stress-Corrosion Cracking in Wrought Heat-Treatable Aluminum Alloy Products AS1990 Aluminum Alloy Tempers 2.2 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken,
11、 PA 19428-2959 or www.astm.org. ASTM B 660 Packaging/Packing of Aluminum and Magnesium Products ASTM B 666/B 666M Identification Marking of Aluminum and Magnesium Products ASTM E 647 Measurement of Fatigue Crack Growth Rates 2.3 ANSI Publications:Available from ANSI, 25 West 43rd Street, New York, N
12、Y 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 REQUIREMENTS: 3.1 Composition:Shall conform to the percentages by weight shown in Tables 1 and 2, determined in accordance with AMS
13、 2355. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE- 3 - AMS 4298 AMS 4298TABLE 1 Composition, Core (2056) Element min max Silicon - 0.10 Iron - 0.12 Copper 3.3 4.3 Manganese 0.10 0.50 Magnesi
14、um 0.60 1.4 Chromium - 0.05 Zinc 0.40 0.80 Titanium - 0.10 Other Elements, each - 0.05 Other Elements, total - 0.15 Aluminum remainder TABLE 2 Composition, Cladding (1050) Element min max Silicon + Iron - 0.7 Copper - 0.10 Manganese - 0.05 Magnesium - 0.05 Zinc - 0.10 Titanium - 0.03 Vanadium - 0.05
15、 Other Elements, each - 0.03 Aluminum, by difference 99.3 - 3.2 Condition:Solution heat treated in accordance with AMS 2772 and cold worked to T3 temper.(See AS1990). 3.3 Properties:Product shall conform to the following requirements, determined on the mill product size in accordance with AMS 2355.
16、3.3.1 Long-Transverse Tensile Properties: Shall be as shown in Table 3. TABLE 3A Minimum Tensile Properties, Inch/Pound UnitsNominal Thickness InchesTensile Strength ksiYield Strength at 0.2% Offset ksiElongationin 2 inches or 4D%0.063 to 0.126, incl 62.0 41.0 15 Over 0.126 to 0.236, incl 62.0 40.0
17、16 Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE- 4 - AMS 4298 AMS 4298TABLE 3B Minimum Tensile Properties, SI Units Nominal Thickness MillimetersTensile Strength MPaYield Strength at 0.2% Offs
18、et MPaElongationin 50.8 mm or 4D%1.60 to 3.25, incl 427 283 15 Over 3.25 to 6.00, incl 427 276 16 3.3.2 Fatigue Crack Growth Rate (FCGR): Shall be not higher than the rate (da/dN) shown in Table 4, determined in the T-L orientation in accordance with ASTM E 647, and using the center-cracked tension
19、M(T) specimen, a DK of 30 ksi (33 MPa ), a K gradient of zero, a stress ratio (R) of plus 0.1, and a testing frequency between 2 to 10 Hertz. TABLE 4 Maximum Fatigue Crack Growth RateNominal Thickness InchNominal Thickness Millimetersda/dNinch/cycleda/dNmm/cycle 0.063 to 0.236, incl 1.60 to 6.00, in
20、cl 1.2 x 10-43.05 x 10-33.3.3 Bending: Product shall withstand, without cracking, bending at room temperature through an angle of 180 degrees around a diameter equal to the bend factor shown in Table 5 times the nominal thickness of the product with axis of bend parallel to the direction of rolling.
21、 TABLE 5 Bending ParametersNominal Thickness InchNominal Thickness MillimetersBendFactor0.063 to 0.128, incl 1.60 to 3.25, incl 4 Over 0.128 to 0.236, incl Over 3.25 to 6.00, incl 5 3.3.4 Minimum Average Cladding Thickness: Shall be as shown in Table 6. TABLE 6 Minimum Average Cladding ThicknessNomi
22、nal Thickness InchNominal Thickness MillimetersCladding Thickness Per Side % of Total Thickness 0.063 to 0.236, incl 1.60 to 6.0, incl 2.0 3.4 Quality:Product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detriment
23、al to usage of the product. 3.5 Tolerances:Shall conform to all applicable requirements of ANSI H35.2 or ANSI H35.2M. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE- 5 - AMS 4298 AMS 42984. QUAL
24、ITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection:The vendor of the product shall supply all samples 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 ensu
25、re that the product conforms to specified requirements.4.2 Classification of Tests:4.2.1 Acceptance Tests: Composition (3.1), tensile properties (3.3.1), fatigue-crack growth rate (3.3.2), and tolerances (3.5) are acceptance tests and, except for composition, shall be performed on each inspection lo
26、t. 4.2.2 Periodic Tests: Bending (3.3.3) and cladding thickness (3.3.4) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser.4.3 Sampling and Testing:Shall be in accordance with AMS 2355. One chemical composition analys
27、is shall be determined for each ingot casting drop and one fatigue crack growth test shall be performed on each inspection lot. 4.4 Reports:The vendor of the product shall furnish with each shipment a report stating that the product conforms to the composition and tolerances and showing the numerica
28、l results of tests for tensile properties and fatigue crack growth of each inspection lot and stating that the product conforms to the other technical requirements. This report shall include the identity of the producer, purchase order number, inspection lot number, AMS 4298, size and quantity of th
29、e mill product. 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.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted witho
30、ut license from IHS-,-,-SAE- 6 - AMS 4298 AMS 42985.2 Packaging:5.2.1 Product shall be protected from damage during storage and shipment by a method determined by vendor unless specified by purchaser. Examples of typical protective methods include but are not limited to interleaving with paper or oi
31、ling of the surface. 5.2.2 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 to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT:A vendor
32、shall mention this specification number in all quotations and when acknowledging purchase orders. 7. REJECTIONS:Product not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES:8.1 A change bar (I) located in the left margin is for the
33、 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 of the document title indicates a complete revision of the specification, including technical revisions. Change bars and
34、(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 are primary; dimensions and properties in SI units are shown as the approximate equivalents of the p
35、rimary units and are presented only for information.8.4 Purchase documents should specify not less than the following: AMS 4298 Size of sheet desired. Quantity of sheet desired. 8.5 Keywords:Aluminum, Alclad sheet, (Alclad 2056-T3), solution heat treated and cold worked PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE D Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
