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 2016 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/AMS6439E AEROSPACE MATERIAL SPECIFICATION AMS6439 REV. E Issued 1974-12 Revised 2
5、016-07Superseding AMS6439D Steel Sheet, Strip, and Plate 1.05Cr - 0.55Ni - 1.0Mo - 0.12V (0.42 - 0.48C) (D6AC) Consumable Electrode Vacuum Melted, Annealed (Composition similar to UNS K24728) RATIONALE AMS6439E results from a Five Year Review and update of this specification that includes revision o
6、f decarburization testing methods and reports. 1. SCOPE 1.1 Form This specification covers a premium-aircraft-quality, low-alloy steel in the form of sheet, strip, and plate. 1.2 Application These products have been typically used for parts that may be welded during fabrication and require through-h
7、ardening to high strength levels, for use up to 600 F (316 C), but usage is not limited to such applications. 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 extent specified herein. The supplier may w
8、ork 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 Available from SAE International, 400
9、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 Carbon Steels AMS2300 Steel Cleanliness, Pre
10、mium Aircraft-Quality Magnetic Particle Inspection Procedure SAE INTERNATIONAL AMS6439E Page 2 of 6 AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock AMS2750 Pyrometry ARP1917 Clarification of Terms Used in Aerospace Metals Specifications 2
11、.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 ASTM A604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets ASTM E11
12、2 Determining Average Grain Size ASTM E140 Hardness Conversion Tables for Metals 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 Shall conf
13、orm to the following 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 0.42 0.48 Manganese 0.60 0.90 Silicon 0.15 0.
14、30 Phosphorus - 0.015 Sulfur - 0.015 Chromium 0.90 1.20 Nickel 0.40 0.70 Molybdenum 0.90 1.10 Vanadium 0.08 0.15 Copper - 0.35 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Melting Practice Steel shall be multiple melted using consumable electrode
15、 vacuum process in the remelt cycle. 3.3 Condition The product shall be supplied in the following condition; hardness tests shall be conducted in accordance with ASTM A370. Pyrometry shall be in accordance with AMS2750. SAE INTERNATIONAL AMS6439E Page 3 of 6 3.3.1 Sheet and Strip Cold finished, brig
16、ht or atmosphere annealed, and descaled if necessary; or hot rolled, annealed or normalized at a temperature of 1725 F 25 F (941 C 14 C) and tempered, and descaled; having hardness not higher than 30 HRC, or equivalent (see 8.2). When spheroidize anneal is specified, hardness shall be not higher tha
17、n 100 HRB, or equivalent (see 8.2). 3.3.2 Plate Hot rolled, annealed or normalized at a temperature of 1725 F 25 F (941 C 14 C) and tempered, and descaled having hardness not higher than 30 HRC, or equivalent (see 8.2). When spheroidize anneal is specified, hardness shall be not higher than 100 HRB,
18、 or equivalent (see 8.2). 3.4 Properties The product shall conform to the following requirements; hardness and tensile testing shall be performed in accordance with ASTM A370. 3.4.1 Macrostructure Visual examination of transverse sections as in 4.3.1, etched in accordance with ASTM A604 in hot hydro
19、chloric acid (1:1) at 160 to 180 F (71 to 82 C) for sufficient time to develop a well-defined macrostructure, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the following macrographs of ASTM A604. Table 2 - Macrostructure limits Class
20、Condition Severity 1 Freckles A 2 White Spots A 3 Radial Segregation B 4 Ring Pattern B 3.4.2 Average Grain Size Shall be ASTM 5 or finer, determined in accordance with ASTM E112. 3.4.3 Decarburization Decarburization shall be evaluated by one of the two methods of 3.4.3.1 or 3.4.3.2. 3.4.3.1 Metall
21、ographic 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 Table 3. 3.4.3.2 H
22、ardness Traverse Method The total depth of decarburization shall be determined by a traverse method using microindentation hardness 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
23、changes in surface carbon content. 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 decarb
24、urization on the adjacent surface. Acceptance shall be as listed in Table 3. 3.4.3.3 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 i
25、s 0.065 inches (1.65 mm) or less. SAE INTERNATIONAL AMS6439E Page 4 of 6 3.4.3.4 In case of dispute, the total depth of decarburization determined using the microindentation hardness traverse method shall govern. Table 3A - Maximum total depth of decarburization, inch/pound units Nominal Thickness I
26、nches Total Depth of Decarburization Inch 0.375 to 0.500, incl 0.015 Over 0.500 to 1.000, incl 0.025 Over 1.000 to 2.000, incl 0.035 Over 2.00 As agreed upon Table 3B - Maximum total depth of decarburization, SI units Nominal Thickness Millimeters Total Depth of Decarburization Millimeter 9.52 to 12
27、.70, incl 0.38 Over 12.70 to 25.40, incl 0.64 Over 25.40 to 50.80, incl 0.89 Over 50.80 As agreed upon 3.4.4 Response to Heat Treatment Product shall have the following properties after being hardened by heating in a protective atmosphere to a temperature at 1625 F 25 F (885 C 14 C), holding at the
28、selected temperature for a time commensurate with section thickness, but not less than 20 minutes, and quenching in oil, stress relieved by heating to 400 F 10 F (204 C 6 C), holding at heat for 60 minutes 5 minutes, and cooling in air, and tempered by heating to not lower than 1000 F (538 C), holdi
29、ng at heat for not less than 4 hours, and cooling in air. 3.4.4.1 Tensile Properties Shall be as specified in Table 4. Table 4A - Minimum tensile properties - inch/pound units Property Value Tensile Strength Nominal Thickness, inches Up to 0.250, incl 215 ksi Over 0.250 224 ksi Yield Strength at 0.2
30、% Offset Nominal Thickness, inches Up to 0.250, incl 190 ksi Over 0.250 195 ksi Elongation in 2 inches or 4D 7% Table 4B - Minimum tensile properties - SI units Property Value Tensile Strength Nominal Thickness, mm Up to 6.35, incl 1482 MPa Over 6.35 1544 MPa Yield Strength at 0.2% Offset Nominal Th
31、ickness, mm Up to 6.35, incl 1310 MPa Over 6.35 1345 MPa Elongation in 50.8 mm or 4D 7% SAE INTERNATIONAL AMS6439E Page 5 of 6 3.4.4.2 Hardness Should be not lower than 44 HRC, or equivalent (see 8.2), but the product shall not be rejected on the basis of hardness if the tensile property requirement
32、s are met. 3.5 Quality 3.5.1 Steel shall be premium-aircraft-quality conforming to AMS2300. 3.5.2 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. 3.6 Tolerances Shall
33、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 reserves the right to sample and
34、 to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests Tests to determine conformance to all technical requirements of this specification are classified as acceptance tests and shall be performed on each heat o
35、r lot as applicable. 4.3 Sampling Shall be in accordance with AMS2370 and the following; a heat shall be the consumable electrode remelted ingots produced from steel originally melted as a single furnace charge. 4.3.1 Samples for macrostructure rating (3.3.1) shall be full cross-sectional specimens
36、obtained from the finished billet, slab, or suitable rerolled product representing the top and bottom of at least the first, middle, and last usable ingot of each heat. 4.4 Reports The producer of the product shall furnish with each shipment a report showing producer identity, country where the meta
37、l was melted (e.g., final melt in the case of metal processed by multiple melting operations), the results of tests for composition, macrostructure, average grain size, and frequency-severity cleanliness rating each heat and for tensile properties and hardness of each lot after heat treatment and st
38、ating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat number, AMS6439E, product form, size, and quantity. 4.5 Resampling and Retesting Shall be in accordance with AMS2370. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be
39、 in accordance with AMS2370. SAE INTERNATIONAL AMS6439E Page 6 of 6 5.2 Protective Treatment The 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 re
40、gulations 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 quotations and when acknowledging purchase orders. 7. REJECTIONS Prod
41、uct 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 areas where technical revisions, not editorial changes, have
42、 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 in documents that contain editorial changes only. 8.2 Hardne
43、ss 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 and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.5 Purchase documents should specify not less than the following: AMS6439E Product form and size of product desired Quantity of product desired. PREPARED BY AMS COMMITTEE “E“
