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/AMS6359K AEROSPACE MATERIAL SPECIFICATION AMS6359 REV. K Issued 1942-12 Revised 2
5、015-12 Superseding AMS6359J Steel, Sheet, Strip, and Plate 0.80Cr - 1.8Ni - 0.25Mo (0.38 - 0.43C) (SAE 4340) (Composition similar to UNS G43406) RATIONALE AMS6359K is a Five Year Review and update of this specification that revises condition, grain size requirements, decarburization test methods and
6、 reporting. 1. SCOPE 1.1 Form This specification 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 heat treated parts requiring good tensile and fatigue strengths in combination with good ductility, but usa
7、ge is not limited to such applications. The product may be through-hardened to tensile strength ranges of 260 to 280 ksi (1793 to 1931 MPa) in nominal section thickness of 1.5 inches (38 mm) and under and 180 to 220 ksi (1241 to 1517 MPa) in nominal section thicknesses of 3 inches (76 mm) and under.
8、 1.2.1 Certain design and processing procedures may cause these products to become susceptible to stress-corrosion cracking after heat treatment; ARP1110 recommends practices to minimize such conditions. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purcha
9、se order forms a part of this specification to the 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 i
10、ssue of that document shall apply. 2.1 SAE Publications 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 Ch
11、emical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels SAE INTERNATIONAL AMS6359K Page 2 of 6 AMS2301 Steel Cleanliness, Aircraft Quality, Magnetic Particle Inspection Procedure AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock A
12、MS2807 Identification, Carbon and Low-Alloy Steels, Corrosion and Heat-Resistant Steels and Alloys, Sheet, Strip, Plate, and Aircraft Tubing ARP1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corrosion Resistant Steels and Alloys 2.2 ASTM Publications Available from ASTM Int
13、ernational, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A255 Determining Hardenability of Steel ASTM A370 Mechanical Testing of Steel Products ASTM E112 Determining Average Grain Size ASTM E290 Bend Testing of Material for Ductility A
14、STM 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 Shall conform to the percentages by weight shown in Table 1, determined by wet chemical meth
15、ods in accordance with ASTM E350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element min max Carbon 0.38 0.43 Manganese 0.65 0.85 Silicon 0.15 0.35 Phosphorus - 0.025 Sulfur - 0.025 Chromium 0.70 0.90 Nickel 1.65 2.00 Molybdenum 0.20 0.3
16、0 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 3.3.1.2. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2
17、 Condition The product shall be supplied in the following condition; hardness shall be determined in accordance with ASTM A370: SAE INTERNATIONAL AMS6359K Page 3 of 6 3.2.1 Sheet and Strip Product shall be as specified by purchaser in one of the conditions below (see 8.7). Hardness shall not be high
18、er than 98 HRB, or equivalent (see 8.2). 3.2.1.1 Cold finished, bright or atmosphere annealed, sub-critically annealed or normalized, and descaled if necessary. 3.2.1.2 Hot rolled, annealed, sub-critically annealed or normalized, if necessary, and descaled. 3.2.2 Plate Hot rolled, annealed, sub-crit
19、ically annealed or normalized, if necessary, and descaled, having hardness not higher than 25 HRC, or equivalent (see 8.2). 3.2.2.1 If allowed by the purchaser, cold rolled, annealed, sub-critically annealed or normalized, if necessary, and descaled as necessary, having hardness not higher than 25 H
20、RC, or equivalent (see 8.2). 3.2.3 If product is ordered spheroidize annealed, the degree of spheroidization shall be acceptable to purchaser and producer. 3.3 Properties The product shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A370: 3.3.1
21、Average Grain Size Average grain size shall be determined by 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 heat shall be considered to have fine austenitic grain size if one or more of the following are determined by heat analys
22、is (see 8.6): 3.3.1.2.1 A total aluminum 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 Hardenability Shall be J 12/16 inch (J19 mm) = 53 HRC, minimum, and
23、 J 20/16 inch (J32 mm) = 50 HRC, minimum, determined on the standard end-quench test specimen in accordance with ASTM A255 except that the steel shall be normalized at 1600 F 10 F (871 C 6 C) and the specimen austenitized at 1550 F 10 F (843 C 6 C). 3.3.3 Decarburization Decarburization shall be eva
24、luated by one of the methods of 3.3.3.1or 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 metallographically at a magnification not to exceed 100X. The product shall not show a layer of complete (ferrite) or p
25、artial decarburization exceeding the limits of Table 2. SAE INTERNATIONAL AMS6359K Page 4 of 6 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 magnification not exceeding 100X,
26、 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 decarburization is defined as the perpend
27、icular 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 as listed in Table 2. Table 2A
28、 - 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 1.000 0.035 Table 2B - Maximum total depth of decarburization, SI units Nominal Thickness Millimeters Total Depth of D
29、ecarburization 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 local areas provided the decarburization of such areas does not exceed the above limits by more than 0.005 inch (0.13
30、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. 3.3.4 Bending Product 0.749 inch (19.02 mm) and under in nominal thickness shall be tested in accordance with ASTM E2
31、90 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 room temperature through the angle and bend radius shown in Table 3. In case of dispute, the results of tests using the
32、 guided bend test of ASTM E290 shall govern. Table 3 - Bending parameters Nominal Thickness Inch Nominal Thickness Millimeters Bend Angle deg, min Bend Radius t = nominal thickness Up to 0.249, incl Up to 6.32, incl 180 1.5t Over 0.249 to 0.749, incl Over 6.32 to 19.02, incl 90 1.5t 3.4 Quality The
33、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 AMS2301, except specimens containing nonmetallic inclusions over 1 inch
34、 (25 mm) shall be subject to rejection. 3.5 Tolerances Shall conform to all applicable requirements of AMS2252 (see 8.3). SAE INTERNATIONAL AMS6359K Page 5 of 6 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers tests
35、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 ensure that the product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), har
36、dness (3.2), average grain size (3.3.1), hardenability (3.3.2), decarburization (3.3.3), bending (3.3.4), frequency severity rating (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 p
37、resent, the ASTM E112 grain size test (3.3.1.1) shall be conducted on each lot. 4.2.2 Periodic Tests If 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
38、 exceed one year) 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 where the steel was melted (e.g., final melt
39、 in the case of steel processed by multiple melting operations), results of composition, hardenability, and frequency-severity cleanliness rating of each heat and for hardness, average grain size, if measured, and bending of each lot, and stating that the product conforms to the other technical requ
40、irements. This report shall include the purchase order number, heat and lot numbers, AMS6359K, product form, size, and quantity. If the grain size requirement of 3.3.1 is met by the aluminum, vanadium and/or columbium content, the aluminum, vanadium and/or columbium content shall be reported and a s
41、tatement that the chemistry 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 corro
42、sion 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 ensure carrier acceptance and safe delivery. SAE
43、 INTERNATIONAL AMS6359K Page 6 of 6 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, will be
44、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 document ti
45、tle 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 Sheet and Strip Tolerances AMS2
46、252 specifies the same tolerances for both cold rolled and hot rolled sheet. However, strip products have different tolerances. 8.4 Terms used in AMS are clarified in ARP1917. 8.5 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in
47、SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.6 Grain size The 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
48、 elements defined in 3.3.1.2 as grain refiners are present. Other technical societies have adopted the verification of fine grain steel based on chemistry alone. Included are ASTM International (Documents A6, A20, and A29); American Society of Mechanical Engineers (Documents SA6, SA20, and SA29); Am
49、erican Bureau of Shipping; CSA Group (Canada); EuroNorm documents; American Association of State Highway and Transportation Officials. 8.7 Purchase documents should specify not less than the following: AMS6359K Product form and size of product desired Quantity of product desired For sheet and strip only: if product should be hot rolled or if it should be cold rolled. PREPARED BY AMS COMMITTEE “E”
