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/AMS6434H AEROSPACE MATERIAL SPECIFICATION AMS6434 REV. H Issued 1953-06 Revised 2
5、016-09Superseding AMS6434G Steel, Sheet, Strip, and Plate 0.78Cr - 1.8Ni - 0.35Mo - 0.20V (0.33 - 0.38C) (4335 Mod) (Composition similar to UNS K33517)RATIONALE AMS6434H results from a Five Year Review and update of this specification that includes revisions to condition (3.2), decarburization testi
6、ng methods (3.3.3), grain size testing frequency (4.2) and reporting (4.4). 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 parts, which may be welded during fabricati
7、on, requiring through-hardening to tensile strengths not lower than 180 ksi (1241 MPa), 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 h
8、erein. 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 Publications Available fro
9、m 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 Carbon Steels AMS23
10、01 Steel Cleanliness, Aircraft Quality Magnetic Particle Inspection Procedure SAE INTERNATIONAL AMS6434H 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, Corrosion and Heat-Re
11、sistant Steels and Alloys Sheet, Strip, Plate, and Aircraft Tubing ARP1917 Clarification of Terms Used in Aerospace Metals Specifications 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.
12、ASTM A370 Mechanical Testing of Steel Products ASTM E112 Determining Average Grain Size ASTM E140 Hardness Conversion Tables for Metals 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 Iro
13、n ASTM E384 Microindentation 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 purchase
14、r. Table 1 - Composition Element min max Carbon 0.33 0.38 Manganese 0.60 0.80 Silicon 0.15 0.35 Phosphorus - 0.025 Sulfur - 0.025 Chromium 0.65 0.90 Nickel 1.65 2.00 Molybdenum 0.30 0.40 Vanadium 0.17 0.23 Copper - 0.35 3.1.1 Check Analysis Composition variations shall meet the applicable requiremen
15、ts of AMS2259. 3.2 Condition The product shall be supplied in the following condition; hardness tests shall be conducted in accordance with ASTM A370: 3.2.1 Sheet and Strip Cold finished, bright or atmosphere annealed, sub-critically annealed or normalized, and descaled if necessary; or hot rolled,
16、annealed, and descaled; having hardness not higher than 25 HRC, or equivalent (see 8.2). SAE INTERNATIONAL AMS6434H Page 3 of 6 3.2.2 Plate Hot rolled, annealed, sub-critically annealed or normalized, if necessary, and descaled, having hardness not higher than 25 HRC, or equivalent (see 8.2). 3.2.2.
17、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 requirements; hardness testing shall be per
18、formed in accordance with ASTM A370: 3.3.1 Average Grain Size ASTM No. 5 or finer, determined in accordance with ASTM E112. 3.3.2 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
19、 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 2. In case of dispute, the results of tests using the guided bend test of ASTM E290 shall govern. Table 2 - Bend
20、 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 0.5 t Over 0.249 to 0.749, incl Over 6.32 to 19.02, incl 90 1.5 t 3.3.3 Decarburization of Each Lot Decarburization shall be evaluated by one
21、 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 metallographically at a magnification not to exceed 100X. Optical indications of decarburization shall not show a layer of complete
22、 (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 traverse method using micro indentation hardness testing in accordance with ASTM E384, at a magnification not exceeding 100X, conducted
23、on a hardened but untempered specimen protected during heat treatment to prevent 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 sh
24、all 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 3. SAE INTERNATIONAL AMS6434H Page 4 of 6 Table 3A - Maximum decarburization, inch/pound units Nominal Wall Thickness Inches Total Depth of Decar
25、burization Inch Up to 0.500, incl 0.015 Over 0.500 to 1.000, incl 0.025 Over 1.000 0.035 Table 3B - Maximum 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
26、 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. 3.3.3.4 In the case of dispute, the total depth of decarburization de
27、termined using the micro indentation hardness traverse method shall govern. 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-q
28、uality conforming to AMS2301. 3.5 Tolerances Shall be in accordance with 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 r
29、eserves 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), condition (3.2), bending (3.3.2), decarburization (3.3.3), micro-inclusion rating
30、(3.4.1) and tolerances (3.5) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Average grain size (3.3.1) is a periodic test and shall be performed at a frequency selected by the producer (not to exceed one year) unless frequency of testing is specif
31、ied by purchaser. SAE INTERNATIONAL AMS6434H Page 5 of 6 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 metal was melted (e.g., final melt in the case of
32、metal processed by multiple melting operations), results of tests for composition and frequency-severity cleanliness rating of each heat, and for hardness and bending of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order
33、number, heat and lot numbers, AMS6434H, 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 in accordance with AMS2807. 5.2 Protective Treatment The product shall be protected from corrosion prior
34、 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. 6. ACKNOWLEDG
35、MENT 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 subject to rejection. 8. NOTES 8.1 Revision Indic
36、ator 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 title indicates a complete revision of the document
37、, 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 clarified in ARP1917. SAE INTERNATIONAL AMS6434H Page 6 of
38、 6 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 spe
39、cify not less than the following: AMS6434H Product form and size of the product desired Quantity of product desired. 8.6 When vanadium, a grain refiner, is present above 0.02% the grain size resulting from using the appropriate test procedures per ASTM E112 will satisfy an ASTM 5 or finer requiremen
40、t. 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 Bureau of Shipping; CSA Group (Canada); EuroNorm documents; American Association of State Highway and Transportation Officials. PREPARED BY AMS COMMITTEE “E“
