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/AMS6350N AEROSPACE MATERIAL SPECIFICATION AMS6350 REV. N Issued 1942-12 Revised 2
5、015-12 Superseding AMS6350M Steel Sheet, Strip, and Plate 0.95Cr - 0.20Mo (0.28 - 0.33C) (SAE 4130) (Composition similar to UNS G41300) RATIONALE AMS6350N revises condition, decarburization testing methods, grain size requirements and reporting. 1. SCOPE 1.1 Form This specification covers an aircraf
6、t-quality, low-alloy steel in the form of sheet, strip, and plate. 1.2 Application These products have been used typically for use where welding and moderate tensile properties are required, but usage is not limited to such applications. Sheet and strip are extensively used where minimum tensile str
7、ength of 180 ksi (1241 MPa) is required in sections up to 0.125 inch (3.18 mm) in nominal thickness and proportionately lower strength is required in heavier thicknesses. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this spe
8、cification 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 issue of that document shall apply
9、. 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 Chemical Check Analysis Limits, Wro
10、ught Low-Alloy and Carbon Steels AMS2301 Steel Cleanliness, Aircraft Quality Magnetic Particle Inspection Procedure SAE INTERNATIONAL AMS6350N Page 2 of 6 AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock AMS2807 Identification, Carbon and
11、Low-Alloy Steels, 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
12、 Steel Products ASTM 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
13、.1 Composition Shall 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
14、Silicon 0.15 0.35 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
15、.2.2. 3.1.2 Check 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 determined in accordance with ASTM A370: 3.2.1 Sheet and Strip Cold rolled or hot rolled, annealed, sub-criti
16、cally annealed or normalized if necessary and descaled as necessary, having hardness not higher than 98 HRB, or equivalent (see 8.2). SAE INTERNATIONAL AMS6350N Page 3 of 6 3.2.2 Plate Hot rolled, annealed, sub-critically annealed or normalized if necessary, and descaled, having hardness not higher
17、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 HRC, or equivalent (see 8.2). 3.3 Properties The product shall conform to the following r
18、equirements; hardness and tensile testing shall be performed in accordance with ASTM A370: 3.3.1 Response 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
19、lower than 125 ksi (862 MPa) or hardness not lower than 26 HRC, or equivalent (see 8.2), after being hardened 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
20、 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 E112. 3.3.2.2 The product of the 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): 3.3.2.2.1 A t
21、otal 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 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
22、. 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 partial decarburization exceeding the limits of Ta
23、ble 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 magnification not exceeding 100X, conducted on a hardened but untempered specimen protected during heat treatment to prev
24、ent 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 perpendicular distance from the surface to the depth under that surface where there is not furt
25、her 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. SAE INTERNATIONAL AMS6350N Page 4 of 6 Table 2A - Maximum total depth of decarburization, inch/p
26、ound 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 Decarburization Millimeter Up to 12.70, incl 0.38
27、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 mm) and the width is 0.065 inch (1.65 mm) or less
28、. 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 E290 using a sample prepared nominally 0.75 inch (1
29、9.0 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 guided bend test of ASTM E290 shall govern. Tabl
30、e 3 - Bend requirements Nominal Thickness Inch Nominal Thickness Millimeters Bend Angle Degrees Bend Radius t = nominal thickness 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
31、 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. 3.5 Tolerances Shall conform to all applicable requirements of AMS2252. 4. QUALITY ASSURANCE PROVISIONS 4.1 Respo
32、nsibility 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 reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to
33、 specified requirements. SAE INTERNATIONAL AMS6350N Page 5 of 6 4.2 Classification of Tests 4.2.1 Ingot Cast Product 4.2.1.1 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), bending (3.3.4), frequency-severity
34、 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 (3.3.2.2) 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 ele
35、ments (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. 4.2.2 Continuous Cast Product 4.2.2.1 Acceptance
36、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), 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
37、 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 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 at a frequency selected by the producer
38、 (not to exceed one year) unless frequency of testing is specified by purchaser. Frequency-severity rating (3.4.1) is a periodic tests 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
39、 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 in the case of steel processed by multiple melting operations), results of tests for composition of each heat and for h
40、ardness, response to heat treatment, average grain size, if measured and bending of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6350N, product form, size, and quantity. If the grain
41、 size requirement of 3.3.2 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 chemistry satisfies the grain size requirement shall be included. 4.5 Resampling and Retesting Shall be in accordance with
42、AMS2370. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with AMS2807. SAE INTERNATIONAL AMS6350N Page 6 of 6 5.2 Protective Treatment Product shall be protected from corrosion prior to shipment. 5.3 Packaging The product shall be prepared for shipment in accordance with commer
43、cial 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 shall include this specification number and its revision letter in all quotation
44、s 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 Revision Indicator A change bar (l) located in the left margin is for the convenience of the user in locating
45、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 revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor
46、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 properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units
47、 and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.5 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 element
48、s 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 alone. Included are ASTM International (Documents A6, A20, and A29); American Society of Mechanical Engineers (Documents SA6, SA20, and SA29); American B
49、ureau 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: AMS6350N Product form and size of product desired Quantity of product desired. PREPARED BY AMS COMMITTEE “E“
