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/AMS6433G AEROSPACE MATERIAL SPECIFICATION AMS6433 REV. G Issued 1961-01 Reaffirme
5、d 2006-02 Revised 2015-07 Superseding AMS6433F Steel, Sheet, Strip, and Plate 0.75Mn - 0.78Cr - 1.8Ni - 0.35Mo - 0.20V (0.33 - 0.38C) (4335 Mod) (Composition similar to UNS K33517) RATIONALE AMS6433G results from a Five Year Review and update of this specification that revises grain size, decarburiz
6、ation and 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 that may be welded during fabrication, requiring through-hardening to high stre
7、ngth levels and that may be used at operational stress levels approaching the yield strength, but usage is not limited to such applications. Steel may be notch sensitive when heat treated above 200 ksi (1379 MPa) yield strength; consequently, caution should be exercised in this respect. 2. APPLICABL
8、E 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 work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has
9、 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 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA),
10、 www.sae.org. AMS2252 Tolerances, Low-Alloy Steel Sheet, Strip, and Plate AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2301 Steel Cleanliness, Aircraft-Quality, Magnetic Particle Inspection Procedure SAE INTERNATIONAL AMS6433G Page 2 of 6 AMS2370 Quality Assurance S
11、ampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock AMS2750 Pyrometry AMS2807 Identification, Carbon and Low-Alloy Steels, Corrosion and Heat-Resistant Steels and Alloys, Sheet, Strip, Plate, and Aircraft Tubing AMS-H-6875 Heat Treatment of Steel Raw Materials 2.2 ASTM
12、 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 A255 Determining Hardenability of Steel ASTM A370 Mechanical Testing of Steel Products ASTM E45 Determining the Inclusion Content of Steel AS
13、TM E112 Determining Average Grain Size 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 conform to the percentages by weight shown in
14、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 0.33 0.38 Manganese 0.60 0.90 Silicon 0.40 0.60 Phosphorus - 0.015 Sulfur - 0.015 Chromium 0.65 0
15、.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 requirements of AMS2259. 3.2 Condition The product shall be supplied in the following condition; hardness shall be determined in accordance with ASTM A370:
16、 SAE INTERNATIONAL AMS6433G Page 3 of 6 3.2.1 Sheet and Strip Cold finished, bright or atmosphere annealed, and descaled if necessary; or hot rolled, annealed if necessary, and descaled; having hardness not higher than 30 HRC, or equivalent (See 8.2). 3.2.2 Plate Normalized and tempered in accordanc
17、e with AMS-H-6875 to a hardness not higher than 269 HB or equivalent (See 8.2). Pyrometry shall be in accordance with AMS2750. 3.2.3 When spheroidize anneal is specified, hardness shall be not higher than 100 HRB, or equivalent (See 8.2). 3.3 Properties The product shall conform to the following req
18、uirements; hardness and tensile testing shall be performed in accordance with ASTM A370: 3.3.1 Hardenability Shall be J1/16 inch (1.6 mm) = 58 HRC maximum and J15/16 inch (23.8 mm) = 47 HRC minimum, determined in accordance with ASTM A255, except that the steel shall be normalized at 1700 F 10 (927
19、C 6) and the test specimen austenitized at 1625 F 10 (885 C 6). 3.3.2 Average Grain Size Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112. 3.3.3 Micro-Inclusion Rating At least one specimen from each ingot tested as well as 2/3 of the total number of specimens and the average of
20、 all specimens shall not exceed the limits shown in Table 2, determined in accordance with ASTM E45, Method A, except that the length of any inclusion shall be not greater than 0.025 inch (0.64 mm): Table 2 - Micro-inclusion rating limits Type A B C D Thin 2.0 2.0 3.0 3.0 Heavy 2.0 2.0 2.0 2.0 3.3.4
21、 Decarburization Decarburization shall be evaluated by one of the two methods of 3.3.4.1 or 3.3.4.2. 3.3.4.1 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 ind
22、ications of decarburization (including complete decarburization ferrite plus partial decarburization shall not exceed the limits of Table 3. 3.3.4.2 Hardness Traverse Method The total depth of decarburization shall be determined by a traverse method using microhardness testing in accordance with AST
23、M 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. Depth of decarburization is defined as the perpendicular distance from the surface to the depth under that surface where there
24、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 3. SAE INTERNATIONAL AMS6433G Page 4 of 6 3.3.4.3 When determining the depth of decarbur
25、ization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the limits in Table 3 by more than 0.005 inch (0.13 mm) and the width is 0.065 inches (1.65 mm) or less. 3.3.4.4 In case of dispute, the total depth of decarburization determined using the
26、microhardness traverse method shall govern. Table 3A - Maximum total depth of decarburization limits, inch/pound units Nominal Thickness Inches 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 Table 3B - Maximum total dept
27、h of decarburization limits, SI units Nominal Thickness Millimeters Total Depth of Decarburization Millimeter 9.52 to 12.70, incl 0.38 Over 12.70 to 25.40, incl 0.64 Over 25.40 to 50.80, incl 0.89 3.3.5 Response to Heat Treatment Product shall meet the requirements of Table 4 after being austenitize
28、d by heating to 1625 F 25 (885 C 14), holding at heat for 60 minutes 5, and quenching in oil and tempered by heating to a temperature not lower than 700 F (371 C), holding at heat for not less than 2 hours, and cooling in air. Table 4A - Minimum tensile properties, inch/pound units Property Value Te
29、nsile Strength Yield Strength at 0.2% Offset Elongation in 2 inches or 4D Nominal Thickness, Inches Up to 0.070, incl Over 0.070 to 0.249, incl Over 0.249 to 0.349, incl Over 0.349 205 ksi 190 ksi 5% 6% 8% 10% Table 4B - Minimum tensile properties, SI units Property Value Tensile Strength Yield Stre
30、ngth at 0.2% Offset Elongation in 50.8 mm or 4D Nominal Thickness, Millimeters Up to 1.78, incl Over 1.78 to 6.32, incl Over 6.32 to 8.86, incl Over 8.86 1413 MPa 1310 MPa 5% 6% 8% 10% SAE INTERNATIONAL AMS6433G Page 5 of 6 3.4 Quality The product, as received by purchaser, shall be uniform in quali
31、ty 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 Responsibility
32、 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 specifie
33、d requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), condition (3.2), hardenability (3.3.1), micro-inclusion rating (3.3.3), decarburization (3.3.4), frequency-severity cleanliness rating (3.4.1), and tolerances (3.5) are acceptance tests and shall be performed on ea
34、ch heat or lot as applicable. 4.2.2 Periodic Tests Average grain size (3.3.2) (See 8.5) and response to heat treatment (3.3.5) are periodic tests and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling Shall be in accordance
35、with AMS2370. 4.4 Reports The producer of the product shall furnish with each shipment a report showing the producer identity and country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition, hardenabilit
36、y, micro-inclusion rating, and frequency-severity cleanliness rating for each heat and for condition and, if measured, average grain size, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6433G, p
37、roduct 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 to shipment. SAE INTERNATIONAL AMS6433G
38、Page 6 of 6 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. ACKNOWLEDGME
39、NT 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 A change bar (l)
40、 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 technical
41、 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. 8.4 Dimensions and properties in inch/pound units and the
42、 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 When vanadium, a grain refiner, is present above 0.02% the grain size resulting from usin
43、g the appropriate test procedures per ASTM E112 will always satisfy an ASTM 5 or finer requirement. Many other technical societies have adopted the verification of fine grain steel based on chemistry alone: ASTM International (A6, A20, A29); American Society of Mechanical Engineers (SA6, SA20, SA29)
44、; American Bureau of Shipping; CSA International; EuroNorm; American Association of State Highway and Transportation Officials. 8.6 Purchase documents should specify not less than the following: AMS6433G Product form and size of the product desired Quantity of product desired. 8.7 Note that this alloy is also known as 4335V. PREPARED BY AMS COMMITTEE “E“
