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 theref
2、rom, 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 2015 SAE InternationalAll rights reserved. No part of this publi
3、cation 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: +1 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS6357LAEROSPACEMATERIAL SPECIFICATIONAMS6357 REV. LIssued 1942-09Revised 2015-12Superseding
5、 AMS6357KSteel Sheet, Strip, and Plate0.50Cr - 0.55Ni - 0.25Mo (0.33 - 0.38C) (8735)(Composition similar to UNS G87350)RATIONALEAMS6357L is a Five Year Review and update of this specification that revises grain size, decarburization test methods and reporting.1. SCOPE1.1 Form This specification cove
6、rs an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.1.2 Application This product has been used typically for components requiring welding and moderate tensile properties, but usage is not limited to such applications. Product 0.125 inch (3.18 mm) and under in nominal thick
7、ness can be through-hardened to a minimum tensile strength of 180 ksi (1241 MPa); greater thickness will present proportionately lower strength.2. APPLICABLE DOCUMENTSThe issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent spe
8、cified 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 that document shall apply.2.1 SAE Publications Availa
9、ble from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org.AMS2252 Tolerances, Low-Alloy Steel Sheet, Strip, and PlateAMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steel
10、sAMS2301 Steel Cleanliness, Aircraft Quality Magnetic Particle Inspection ProcedureSAE INTERNATIONAL AMS6357L Page 2 of 6AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging StockAMS2807 Identification, Carbon and Low-Alloy Steels, Corrosion and Hea
11、t-Resistant Steels and Alloys, Sheet, Strip, Plate, and Aircraft Tubing2.2 ASTM Publications 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 A370 Mechanical Testing of Steel ProductsASTM E112 Determining
12、Average Grain SizeASTM E290 Bend Testing of Material for DuctilityASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought IronASTM E384 Knoop and Vickers Hardness of Materials3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percen
13、tages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E350, by spectrochemical methods, or by other analytical methods acceptable to purchaser.Table 1 - CompositionElement min maxCarbon 0.33 0.38Manganese 0.75 1.00Silicon 0.15 0.35Phosphorus - 0.025Sulfur - 0.0
14、25Chromium 0.40 0.60Nickel 0.40 0.70Molybdenum 0.20 0.30Copper - 0.353.1.1 Aluminum, vanadium and columbium are optional grain refining elements and need not be determined or reported unless used to satisfy the average grain size requirements of 3.3.1.23.1.2 Check AnalysisComposition variations shal
15、l meet the applicable requirements of AMS2259.3.2 Condition The product shall be supplied in the following condition; hardness shall be determined in accordance with ASTM A370:3.2.1 Sheet and StripCold finished, bright or atmosphere annealed, and descaled if necessary, or hot rolled, annealed if nec
16、essary, and descaled; having hardness not higher than 98 HRB, or equivalent (see 8.2).SAE INTERNATIONAL AMS6357L Page 3 of 63.2.2 PlateHot rolled, annealed if necessary, and descaled having hardness not higher than 24 HRC, or equivalent (see 8.2).3.2.2.1 If allowed by the purchaser, cold rolled, ann
17、ealed if necessary, and descaled having hardness not higher than 24 HRC, or equivalent (see 8.2).3.3 Properties The product shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A370:3.3.1 Average Grain SizeAverage grain size shall be determined by
18、either 3.3.1.1 or 3.3.1.2.3.3.1.1 Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112.3.3.1.2 The product of a heat shall be considered to have an ASTM No. 5 or finer austenitic grain size if one or more of the following are determined by heat analysis (see 8.5):3.3.1.2.1 A total a
19、luminum content of 0.020 to 0.050%.3.3.1.2.2 An acid soluble aluminum content of 0.015 to 0.050%.3.3.1.2.3 A vanadium content of 0.02 to 0.08%.3.3.1.2.4 A columbium content of 0.02 to 0.05%.3.3.2 Response to Heat TreatmentProduct 0.499 inch (12.67 mm) and under in nominal thickness shall have tensil
20、e strength not lower than 125 ksi (862 MPa) or hardness not lower than 26 HRC, or equivalent (see 8.2), after being heated to 1525 F 10 F (829 C 6 C), held at heat for 15 to 30 minutes, quenched in oil, tempered by heating to 1000 F 10 F (538 C 6 C), holding at heat for not less than 30 minutes, and
21、 cooling in air. 3.3.3 DecarburizationDecarburization shall be evaluated by one of the two methods of 3.3.3.1 or 3.3.3.2.3.3.3.1 Metallographic MethodA cross section taken perpendicular to the surface shall be prepared, etched, and visually examined metallographically at a magnification not to excee
22、d 100X. The product shall not show a layer of complete (ferrite) or partial decarburization exceeding the limits of Table 2.3.3.3.2 Hardness Traverse Method The total depth of decarburization shall be determined by a traverse method using microhardness testing in accordance with ASTM E384, at a magn
23、ification not exceeding 100X, conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Tempering is generally not recommended, but if tempered, the tempering temperature shall be not higher than 300 F (149 C). Depth of decarburizat
24、ion is defined as the perpendicular distance from the surface to the depth under that surface where there is not further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by any decarburization on the adjacent surface. Acceptance shall be a
25、s listed in Table 2.SAE INTERNATIONAL AMS6357L Page 4 of 63.3.3.3 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the limits of Table 2 by more than 0.005 inch (0.13 mm) and the width is 0.065 inches
26、 (1.65 mm) or less.3.3.3.4 In case of dispute, the total depth of decarburization determined using the microhardness traverse method shall govern.Table 2A - Maximum total depth of decarburization, inch/pound unitsNominal ThicknessInchesTotal Depth of DecarburizationInch0.375 to 0.500, incl 0.015Over
27、 0.500 to 1.000, incl 0.025Over 1.000 to 2.000, incl 0.035Table 2B - Maximum total depth of decarburization, SI unitsNominal ThicknessMillimetersTotal Depth of DecarburizationMillimeter9.52 to 12.70, incl 0.38Over 12.70 to 25.40, incl 0.64Over 25.40 to 50.80, incl 0.893.3.4 BendingProduct 0.749 inch
28、 (19.02 mm) and under in nominal thickness shall be tested in accordance with ASTM E290 using a sample prepared nominally 0.75 inch (19.0 mm) in width with its axis of bending parallel to the direction of rolling and shallwithstand without cracking when bending at room temperature through the angle
29、and bend radius shown in Table 3. In case of dispute, the results of tests using the guided bend test of ASTM E290 shall govern.Table 3 - Bending requirementsNominal ThicknessInchNominal ThicknessMillimetersBend AngleDegreesBend Radiust = nominal thicknessUp to 0.249, incl Up to 6.32, incl 180 1/2tO
30、ver 0.249 to 0.749, incl Over 6.32 to 19.02, incl 90 1/2t3.4 Quality The product, 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 product.3.4.1 Steel shall be aircraft-quality conforming to
31、 AMS2301.3.5 Tolerances Shall conform to all applicable requirements of AMS2252.4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers tests and shall be responsible for the performance of all required tests. Purchaser res
32、erves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements.SAE INTERNATIONAL AMS6357L Page 5 of 64.2 Classification of Tests 4.2.1 Acceptance TestsComposition (3.1), hardness (3.2), average grain size (3.3.1), resp
33、onse to heat treatment (3.3.2), decarburization (3.3.3), bending (3.3.4), frequency and severity (3.4.1) and tolerances (3.5) are classified as acceptance tests and shall be performed on each heat or lot as applicable. If grain refining elements (3.3.1.2) are not present, the ASTM E112 grain size te
34、st (3.3.1.1) shall be conducted on each lot.4.2.2 Periodic TestsIf grain refining elements (3.3.1.2) are present, the ASTM E112 grain size test (3.3.1.1) shall be conducted on a periodic basis and shall be performed at a frequency selected by the producer (not to exceed one year) unless frequency of
35、 testing is specified by purchaser.4.3 Sampling and Testing Shall be in accordance with AMS2370.4.4 Reports The producer of the product shall furnish with each shipment a report showing producer identity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple
36、 melting operations), the results of tests for composition and frequency-severity cleanliness rating of each heat, and for hardness, response to heat treatment and, if measured, average grain size of each lot, and stating that the product conforms to the other technical requirements. This report sha
37、ll include the purchase order number, heat and lot numbers, AMS6357L, product form, size, and quantity. If the grain size requirement of 3.3.1.2 is met by the aluminum, vanadium and/or columbium content, the aluminum, vanadium and/or columbium content shall be reported and a statement that the chemi
38、stry satisfies the grain size requirement shall be included.4.5 Resampling and Retesting Shall be in accordance with AMS2370.5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with AMS2807.5.2 Protective Treatment The product shall be protected from corrosion prior to shipment.5.3
39、 Packaging The product shall be prepared for shipment in accordance with commercial practice 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 producer s
40、hall include this specification number and its revision letter in all quotations and when acknowledging purchaseorders.7. REJECTIONS Product not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection.SAE INTERNATIONAL AMS6357L Page 6 of 68. NOTES
41、8.1 Revision IndicatorA change bar (l) 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 document. An (R) symbol to the left of the document title indicates a complete revisio
42、n of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.8.2 Hardness conversion tables for metals are presented in ASTM E140.8.3 Terms used in AMS are clarified in ARP1917.8.4 Dimensions and pro
43、perties in inch/pound units and 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.8.5 Grain sizeThe average grain size resulting from using t
44、he appropriate test procedures per ASTM E112 will always satisfy an ASTM No. 5 or finer grain size when the elements defined in 3.3.1.2 as grain refiners are present. Many other technical societies have adopted the verification of fine grain steel based on chemistry alone: ASTM International (A6, A2
45、0, A29); American Society of Mechanical Engineers (SA6, SA20, SA29); American Bureau of Shipping; CSA International; EuroNorm; American Association of State Highway and Transportation Officials. 8.6 Purchase documents should specify not less than the following:AMS6357LProduct form and size of product desiredQuantity of product desired.PREPARED BY AMS COMMITTEE “E”
