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 2015 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/AMS6351K AEROSPACE MATERIAL SPECIFICATION AMS6351 REV. K Issued 1953-12 Revised 2
5、015-12 Superseding AMS6351J Steel, Sheet, Strip, and Plate 0.95Cr - 0.20Mo (0.28 - 0.33C) (SAE 4130) Spheroidized (Composition similar to UNS G41300) RATIONALE AMS6351K revises the macrostructure, grain size requirements, decarburization testing methods and reporting. 1. SCOPE 1.1 Form This specific
6、ation covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate. 1.2 Application These products have been used typically for general use where deep drawing and forming are required, but usage is not limited to such applications. Product may be through-hardened to a minimum t
7、ensile strength of 180 ksi (1241 MPa) in sections 0.125 inch (3.18 mm) and under in nominal thickness and lower strength in heavier section thicknesses. 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
8、extent specified 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 Publicat
9、ions Available 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 Plate AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and
10、 Carbon Steels AMS2301 Steel Cleanliness, Aircraft Quality, Magnetic Particle Inspection Procedure SAE INTERNATIONAL AMS6351K Page 2 of 6 AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock AMS2807 Identification, Carbon and Low-Alloy Steels,
11、 Corrosion and Heat-Resistant Steels and Alloys, Sheet, Strip, Plate, and Aircraft Tubing 2.2 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 Products A
12、STM E112 Determining Average Grain Size ASTM E290 Bend Testing of Material for Ductility ASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E384 Knoop and Vickers Hardness of Materials 3. TECHNICAL REQUIREMENTS 3.1 Composition Sh
13、all conform to the percentages 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 - Composition Element min max Carbon 0.28 0.33 Manganese 0.40 0.60 Silicon 0.15 0.3
14、5 Phosphorus - 0.025 Sulfur - 0.025 Chromium 0.80 1.10 Molybdenum 0.15 0.25 Nickel - 0.25 Copper - 0.35 3.1.1 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 3.3.2.2. 3.1.2 Chec
15、k Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Condition The product shall be supplied in the following condition; hardness shall be not higher than 85 HRB, or equivalent (see 8.2), determined in accordance with ASTM A370. 3.2.1 Sheet and Strip Cold rolled o
16、r hot rolled, annealed to develop a uniform microstructure of spheroidized cementite in ferrite matrix, and descaled. SAE INTERNATIONAL AMS6351K Page 3 of 6 3.2.2 Plate Hot rolled, annealed to develop a uniform microstructure of spheroidized cementite in ferrite matrix, and descaled. 3.2.2.1 If allo
17、wed by the purchaser, cold rolled, annealed to develop a uniform microstructure of spheroidized cementite in ferrite matrix, and descaled. 3.3 Properties The product shall conform to the following requirements; hardness and tensile testing shall be performed in accordance with ASTM A370: 3.3.1 Respo
18、nse to Heat Treatment Product 0.249 inch (6.32 mm) and under in nominal thickness and thicker product reduced to 0.249 inch 0.010 inch (6.32 mm 0.25 mm) in thickness shall have tensile strength not lower than 125 ksi (862 MPa) or hardness not lower than 26 HRC, or equivalent (see 8.2), after being h
19、ardened by quenching in oil from 1600 F 10 F (871 C 6 C), and tempered for not less than 30 minutes at not lower than 900 F (482 C). 3.3.2 Average Grain Size Average grain size shall be determined by either 3.3.2.1 or 3.3.2.2. 3.3.2.1 Shall be ASTM No. 5 or finer, determined in accordance with ASTM
20、E112. 3.3.2.2 The heat shall be considered to have fine austenitic grain size if one or more of the following are determined by heat analysis (see 8.5): 3.3.2.2.1 A total aluminum content of 0.020 to 0.050%. 3.3.2.2.2 An acid soluble aluminum content of 0.015 to 0.050%. 3.3.2.2.3 A vanadium content
21、of 0.02 to 0.08%. 3.3.2.2.4 A columbium content of 0.02 to 0.05%. 3.3.3 Decarburization Decarburization shall be evaluated by one of the methods of 3.3.3.1 or 3.3.3.2. 3.3.3.1 Metallographic Method A cross section taken perpendicular to the surface shall be prepared, etched, and visually examined me
22、tallographically at a magnification not to exceed 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 microhardnes
23、s testing in accordance with ASTM E384, at a magnification 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
24、 higher than 300 F (149 C). Depth of decarburization 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 decarburizati
25、on on the adjacent surface. Acceptance shall be as listed in Table 2. SAE INTERNATIONAL AMS6351K Page 4 of 6 Table 2A - Maximum total depth of decarburization, inch/pound units Nominal Thickness Inches Total Depth of Decarburization Inch Up to 0.500, incl 0.015 Over 0.500 to 1.000, incl 0.025 Over 1
26、.000 0.035 Table 2B - Maximum total depth of decarburization, SI units Nominal Thickness Millimeters Total Depth of Decarburization Millimeter Up to 12.70, incl 0.38 Over 12.70 to 25.40, incl 0.64 Over 25.40 0.89 3.3.3.3 When determining the depth of decarburization, it is permissible to disregard l
27、ocal areas provided the decarburization of such areas does not exceed the above limits by more than 0.005 inch (0.13 mm) and the width is 0.065 inch (1.65 mm) or less. 3.3.3.4 In the case of dispute, the total depth of decarburization determined using the microhardness traverse method shall govern.
28、3.3.4 Bending Product 0.749 inch (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 shall withstand without cracking when bending at ro
29、om temperature through the angle 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 - Bend angle requirements Nominal Thickness Inch Nominal Thickness Millimeters Bend Angle Degrees Bend Radius t = nominal thicknes
30、s Up to 0.249, incl Up to 6.32, incl 180 1/2t Over 0.249 to 0.749, incl Over 6.32 to 19.02, incl 90 1/2t 3.4 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.
31、4.1 Steel shall be aircraft-quality conforming to 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 t
32、he performance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. SAE INTERNATIONAL AMS6351K Page 5 of 6 4.2 Classification of Tests 4.2.1 Ingot Cast Product 4.2.1.1 Acc
33、eptance Tests Composition (3.1), hardness (3.2), response to heat treatment (3.3.1), average grain size (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. I
34、f grain refining elements (3.3.2.2) are not present, the ASTM E112 grain size test (3.3.2.1) shall be conducted on each lot. 4.2.1.2 Periodic Tests If grain refining elements (3.3.2.2) are present, the ASTM E112 grain size test (3.3.2.1) shall be conducted on a periodic basis and shall be performed
35、at a frequency selected by the producer (not to exceed one year) unless frequency of testing is specified by purchaser. 4.2.2 Continuous Cast Product 4.2.2.1 Acceptance Tests Composition (3.1), hardness (3.2), response to heat treatment (3.3.1), average grain size (3.3.2) decarburization (3.3.3), be
36、nding (3.3.4), and tolerances (3.5) are classified as acceptance tests and shall be performed on each heat or lot as applicable. If grain refining elements (3.3.2.2) are not present, the ASTM E112 grain size test (3.3.2.1) shall be conducted on each lot. 4.2.2.2 Periodic Tests If grain refining elem
37、ents (3.3.2.2) are present, the ASTM E112 grain size test (3.3.2.1) 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 testing is specified by purchaser. Frequency and severity (3.4.1) is a periodic test
38、and shall be performed at a frequency selected by the producer unless frequency of 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 the producer identity, country
39、 where the steel was melted (e.g., final melt in the case of steel processed by multiple melting operations), results of tests for composition and hardness, response to heat treatment, average grain size, if measured, and bending of each lot, and stating that the product conforms to the other techni
40、cal requirements. This report shall include the purchase order number, heat and lot numbers, AMS6351K, product form, size, and quantity. If the grain size requirement of 3.3.2.2 is met by the aluminum, vanadium and/or columbium content, the aluminum, vanadium and/or columbium content shall be report
41、ed and a statement that the chemistry satisfies the grain size requirement shall be included. 4.5 Resampling and Retesting Shall be in accordance with AMS2370. SAE INTERNATIONAL AMS6351K Page 6 of 6 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with AMS2807. 5.2 Protective Tr
42、eatment Product shall be protected from corrosion prior to shipment. 5.3 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 ens
43、ure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A producer shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Product not conforming to this specification, or to modifications authorized by purchaser, wi
44、ll be subject to rejection. 8. NOTES 8.1 Revision Indicator A 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 docum
45、ent title indicates a complete revision 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 cla
46、rified in ARP1917. 8.4 Dimensions and properties 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 size Th
47、e average grain size resulting from using the appropriate test procedures per ASTM E112 will satisfy an ASTM No. 5 or finer grain size when the elements defined in 3.3.2.2 as grain refiners are present. Other technical societies have adopted the verification of fine grain steel based on chemistry al
48、one. Included are ASTM International (Documents A6, A20, and A29); American Society of Mechanical Engineers (Documents SA6, SA20, and SA29); American Bureau of Shipping; CSA Group (Canada); EuroNorm documents; American Association of State Highway and Transportation Officials. 8.6 Purchase documents should specify not less than the following: AMS6351K Product form and size of product desired Quantity of product desired. .PREPARED BY AMS COMMITTEE “E“
