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/AMS6345D AEROSPACE MATERIAL SPECIFICATION AMS6345 REV. D Issued 1996-11 Revised 2
5、015-12 Superseding AMS6345C Steel, Sheet, Strip, and Plate 0.95Cr - 0.20Mo (0.28 - 0.33C) (SAE 4130) Normalized or Otherwise Heat Treated (Composition similar to UNS G41300) RATIONALE AMS6345D is a Five Year Review and update that revises grain size testing, decarburization testing methods and repor
6、ting. 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 where welding and moderate tensile properties are required, but usage is not limited to such applications. Sheet and
7、strip are extensively used where a minimum tensile strength 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 t
8、he date of the purchase 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,
9、 the last published issue 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,
10、 and Plate AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2301 Steel Cleanliness, Aircraft Quality, Magnetic Particle Inspection Procedure SAE INTERNATIONAL AMS6345D Page 2 of 7 AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Product
11、s and Forging Stock AMS2807 Identification, Carbon and 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-
12、832-9585, www.astm.org. ASTM A370 Mechanical Testing of 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 Vi
13、ckers Hardness of Materials 3. TECHNICAL REQUIREMENTS 3.1 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 - Compositio
14、n Element min max Carbon 0.28 0.33 Manganese 0.40 0.60 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 use
15、d to satisfy the average grain size requirements of 3.3.2. 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: 3.2.1 Sheet and Strip Cold rolled, normalized or otherwise heat treated, a
16、nd descaled if necessary, or hot rolled, normalized or otherwise heat treated, and descaled. SAE INTERNATIONAL AMS6345D Page 3 of 7 3.2.2 Plate Hot rolled and normalized or otherwise heat treated. 3.2.2.1 If allowed by the purchaser, cold rolled and normalized or otherwise heat treated. 3.3 Properti
17、es The product shall conform to the following requirements; hardness and tensile testing shall be performed in accordance with ASTM A370: 3.3.1 Tensile Properties The long-transverse tensile properties of the as-supplied product shall be as shown in Table 2 (see 8.2). Table 2A - Minimum tensile prop
18、erties, inch/pound units Thickness Inches Tensile Strength ksi Yield Strength 0.2% Offset ksi Elongation in 2 inches or 4D Percent Up to 0.062, excl 95 75 8 0.062 to 0.125, incl 95 75 10 Over 0.125 to 0.1874, incl 95 75 12 Over 0.1874 to 0.250, incl 90 70 15 Over 0.250 to 0.750, incl 90 70 16 Over 0
19、.750 to 1.500, incl 90 70 18 Table 2B - Minimum tensile properties, SI units Thickness Millimeters Tensile Strength MPa Yield Strength 0.2% Offset MPa Elongation in 50.8 mm or 4D Percent Up to 1.57, excl 655 517 8 1.57 to 3.18, incl 655 517 10 Over 3.18 to 4.760, incl 655 517 12 Over 4.760 to 6.35,
20、incl 621 483 15 Over 6.35 to 19.05, incl 621 483 16 Over 19.05 to 38.10, incl 621 483 18 3.3.2 Average Austenitic 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 E112. 3.3.2.2 The product of a heat shall be conside
21、red to have an ASTM No. 5 or finer austenitic grain size if one or more of the following are determined by heat analysis (see 8.7): 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 of 0.02 to 0.08%. 3.3
22、.2.2.4 A columbium content of 0.02 to 0.05%. SAE INTERNATIONAL AMS6345D Page 4 of 7 3.3.3 Decarburization of Each Lot 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, et
23、ched, 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 Table 3. 3.3.3.2 Hardness Traverse Method The total depth of decarburization shall be determined by a trav
24、erse 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 prevent changes in surface carbon content. Tempering is generally not recommended, but if tempered, the temp
25、ering 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 further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uni
26、nfluenced by any decarburization on the adjacent surface. Acceptance shall be as listed in Table 3. Table 3A - 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 0.03
27、5 Table 3B - 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 local area
28、s 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. 3.3.4 Ben
29、ding Product 0.750 inch (19.05 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 through the an
30、gle and bend radius shown in Table 4. In case of dispute, the results of tests using the guided bend test of ASTM E290 shall govern. Table 4 - Bend requirements Nominal Thickness Inch Nominal Thickness Millimeters Angle Degrees, minimum Bend Radius t = nominal thickness Up to 0.090, excl Up to 2.29,
31、 excl 180 1.5 t 0.090 to 0.1874, incl 2.29 to 4.760, incl 135 1.5 t Over 0.1874 to 0.250, incl Over 4.760 to 6.35, incl 90 1.5 t Over 0.250 to 0.750, incl Over 6.35 to 19.05, incl 90 1.5 t SAE INTERNATIONAL AMS6345D Page 5 of 7 3.3.5 Response to Heat Treatment 3.3.5.1 Tensile Strength Product, 0.249
32、 inch (6.32 mm) and under in nominal thickness, shall have tensile strength not lower than 125 ksi (862 MPa) or equivalent hardness (see 8.3) 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). 3.3.5.2 Hardn
33、ess Product shall develop the applicable minimum center hardness shown in Table 5, or equivalent (see 8.4), when hardened by quenching in oil from 1600 F 10 F (871 C 6 C). Table 5 - Minimum hardness, as quenched Nominal Thickness Inches Nominal Thickness Millimeters Hardness HRC Over 0.249 to 0.375,
34、 incl Over 6.32 to 9.52, incl 42 Over 0.375 to 0.500, incl Over 9.52 to 12.70, incl 38 Over 0.500 to 0.625, incl Over 12.70 to 15.88, incl 32 Over 0.625 to 0.750, incl Over 15.88 to 19.05, incl 29 Over 0.750 to 0.875, incl Over 19.05 to 22.22, incl 27 Over 0.875 to 1.500, incl Over 22.22 to 38.10, i
35、ncl 26 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. 3.4.1 Steel shall be aircraft quality conforming to AMS2301. 3.5 Tolerances Shall conform to all app
36、licable 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 reserves the right to sample and to perform any co
37、nfirmatory 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), condition (3.2), tensile (3.3.1), average grain size (3.3.2) decarburization (3.3.3), bending (3.3.4), response to heat treatment (
38、3.3.5), 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 (3.3.2.2) are not present, the ASTM E112 grain size test (3.3.2.1) shall be conducted on each lot. 4.2.2 Periodic Tes
39、ts 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 (not to exceed one year) unless frequency of testing is specified by purchaser. SAE INTERNATIONAL AMS6345
40、D Page 6 of 7 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 in the case of steel processed by multiple melting operati
41、ons), results of tests of each heat for composition, the average grain size, if measured, and frequency-severity cleanliness rating, and the results of tests for tensile properties and hardness of each lot, and stating that the product conforms to the other technical requirements. This report shall
42、include the purchase order number, heat and lot numbers, AMS6345D, product form, size, and quantity. If the grain 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
43、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
44、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 sh
45、all 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 subject to rejection. 8. NOTES 8.1 Revision Indicator A change bar
46、(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 revision of the document, including techni
47、cal revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 The values shown in Table 2 are those of MIL-S-18729, Condition N, and have not been substantiated in accordance with AMS statistical analysis procedure. 8.3 Tensile st
48、rength to hardness conversions are presented in ASTM A370. 8.4 Hardness conversion tables for metals are presented in ASTM E140. SAE INTERNATIONAL AMS6345D Page 7 of 7 8.5 Terms used in AMS are clarified in ARP1917. 8.6 Dimensions and properties in inch/pound units and the Fahrenheit temperatures ar
49、e 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. 8.7 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 elements defined in 3.3.2.2 as
