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 ther
2、efrom, 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 2017 SAE International All rights reserved. No part of this
3、publication 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: +1 724-776-49
4、70 (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:/standards.sae.org/AMS6435G AEROSPACE MATERIAL SPECIFICATION AMS6435 REV. G Issued 1960-06 Reaffirmed 1984-10 Rev
5、ised 2017-01Superseding AMS6435F Steel, Sheet, Strip, and Plate 0.75Mn - 0.78Cr - 1.8Ni - 0.35Mo - 0.20V (0.33 - 0.38C) (4335 Mod) Vacuum Consumable Electrode Melted, Annealed (Composition similar to UNS K33517) RATIONALE AMS6435G results from a Five-Year Review and update of this specification that
6、 includes revision of the micro-inclusion testing methods (3.4.1.2), decarburization testing methods (3.4.4) and reporting (4.4). 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 u
7、sed typically for parts, that may be welded during fabrication, requiring through-hardening to high strength levels and that may be used at operational stress levels approaching the yield strength, but usage is not limited to such applications. Steel may become notch sensitive when heat treated to a
8、 tensile strength level of 240 ksi (1655 MPa) or higher. 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 work to a subsequent revision of a document unless a s
9、pecific 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 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 8
10、77-606-7323 (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, Premium Aircraft-Quality Magnetic Particle Inspection Pr
11、ocedure SAE INTERNATIONAL AMS6435G Page 2 of 7 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-Resistant Steels and Alloys Sheet, Strip, Plate, and Aircraft Tubing ARP
12、1917 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. ASTM A255 Determining Hardenability of Steel ASTM A370 Mechanical Test
13、ing of Steel Products ASTM E45 Determining the Inclusion Content of Steel ASTM E112 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 Microinden
14、tation 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 - Compositi
15、on Element Min Max Carbon 0.33 0.38Manganese 0.60 0.90 Silicon 0.40 0.60Phosphorus - 0.010 Sulfur - 0.010Chromium 0.65 0.90 Nickel 1.65 2.00Molybdenum 0.30 0.40 Vanadium 0.17 0.23Copper - 0.35 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259 except that c
16、arbon shall vary not more than 0.01 under min or over max and no variation over max will be permitted for phosphorus and sulfur. 3.2 Melting Practice Steel shall be multiple melted using vacuum consumable electrode practice in the remelt cycle. SAE INTERNATIONAL AMS6435G Page 3 of 7 3.3 Condition Th
17、e product shall be supplied in the following condition; hardness shall be determined in accordance with ASTM A370: 3.3.1 Sheet and Strip Cold finished, bright or atmosphere annealed, and descaled if necessary, or, hot rolled, annealed, and descaled, unless otherwise ordered, having hardness not high
18、er than 30 HRC or equivalent (see 8.2). 3.3.2 Plate Hot rolled, annealed, and descaled having hardness not higher than 30 HRC or equivalent (see 8.2). 3.3.2.1 If allowed by purchaser, cold rolled, annealed, and descaled having hardness not higher than 30 HRC or equivalent (see 8.2). 3.3.3 When produ
19、ct is ordered spheroidize annealed, hardness shall be not higher than 100 HRB 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 Micro-Inclusion Rating of Each Heat No sp
20、ecimen shall exceed the limits shown in Table 2, determined in accordance with ASTM E45, Method D. Table 2 - Micro-inclusion rating limits Limits A Thin A Heavy B Thin B Heavy C Thin C Heavy D Thin D Heavy Worst Field Severity 2.0 1.0 1.5 1.0 1.5 1.0 1.5 1.0 Worst Field Frequency, maximum a 1 a 1 a
21、1 5 3 Total Rateable Fields Frequency, maximum b 1 b 1 b 1 c 3 a - Combined A+B+C, not more than 3 fields b - Combined A+B+C, not more than 5 fields c - Any number of lower rateable D-type thin fields per specimen is permitted 3.4.1.1 Thickness of the D-type heavy shall not exceed 0.0005 inch (0.012
22、 mm). 3.4.1.2 A rateable field is defined as one that has a type A, B, C, or D inclusion rating of at least 1.0 thin or heavy in accordance ASTM E45 (see 8.3). 3.4.2 Average Grain Size of Plate, Sheet and Strip Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112. 3.4.3 Hardenabilit
23、y of Each Heat 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 F (925 C 5 C) and the test specimen austenitized at 1625 F 10 F (885 C 5 C). SAE INTERNATIONAL AMS64
24、35G Page 4 of 7 3.4.4 Decarburization of Each Lot Decarburization shall be evaluated by one of the methods of 3.4.4.1 or 3.4.4.2. 3.4.4.1 Metallographic Method A cross section taken perpendicular to the surface shall be prepared, etched, and visually examined metallographically at a magnification no
25、t to exceed 100X. Optical indications of decarburiztion shall not show a layer of complete (ferrite) or partial decarburization exceeding the limits of Table 3. 3.4.4.2 Hardness Traverse Method The total depth of decarburization shall be determined by a traverse method using microindentation hardnes
26、s 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. Depth of decarburization is defined as the perpendicular distance from the surface to the depth
27、 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 decarburization on the adjacent surface. Acceptance shall be as listed in Table 3. Table 3 Table 3A - Maximum decarburization limits, in
28、ch/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 0.035 Table 3B - Maximum decarburization limits, SI units Nominal Thickness Millimeters Total Depth of Decarburization Millimeter Up to 12.50, incl 0.38 Over
29、 12.50 to 25.00, incl 0.62 Over 25.00 0.88 3.4.4.3 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. 3.
30、4.4.4 In the case of dispute, the total depth of decarburization determined using the microindentation hardness traverse method shall govern. 3.4.5 Response to Heat Treatment Specimens shall meet the requirements shown in Table 4 after being hardened by heating to 1625 F 25 F (885 C 15 C), holding a
31、t heat for 60 minutes 5 minutes, and quenching in oil, and tempered by heating to a temperature between 400 and 500 F (205 and 260 C), holding at heat for not less than 2 hours, and cooling in air. SAE INTERNATIONAL AMS6435G Page 5 of 7 Table 4 Table 4A - Minimum tensile properties, inch/pound units
32、 Property Value Tensile Strength Yield Strength at 0.2% Offset Elongation in 2 inches or 4D, min Nominal Thickness, Inch Up to 0.070, incl Over 0.070 to 0.249, incl Over 0.249 240 ksi 210 ksi 5% 6% 8% Table 4B - Minimum tensile properties, SI units Property ValueTensile Strength Yield Strength at 0.
33、2% Offset Elongation in 50.8 mm or 4D, min Nominal Thickness, Millimeters Up to 1.75, incl Over 1.75 to 6.25, incl Over 6.25 1655 MPa 1450 MPa 5% 6% 8% 3.5 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperf
34、ections detrimental to usage of the product. 3.5.1 Steel shall be premium aircraft-quality conforming to AMS2300 except that a maximum average frequency (F) rating of 0.10 and a maximum average severity (S) rating of 0.20 shall apply. 3.6 Tolerances Shall be in accordance with AMS2252. 4. QUALITY AS
35、SURANCE 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 confirmatory testing deemed necessary to ensure
36、that the product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), condition (3.3), micro-inclusion rating (3.4.1), average grain size (3.4.2), hardenability (3.4.3), decarburization (3.4.4), and tolerances (3.6) are acceptance tests and shall
37、be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Response to heat treatment (3.4.5) and frequency-severity cleanliness rating (3.5.1) are periodic tests and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampl
38、ing Shall be in accordance with AMS2370. SAE INTERNATIONAL AMS6435G Page 6 of 7 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 metal processed by multiple melting ope
39、rations), results of tests for composition, micro-inclusion rating, and hardenability of each heat, and for the hardness and average grain size 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 nu
40、mbers, AMS6435G, product form, size, and quantity from each heat. 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 ship
41、ment. 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. ACKNOWLEDGMENT A p
42、roducer shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Material not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 Revision Indicator A
43、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, inclu
44、ding 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. 8.4 Dimensions and properties in inch/pound
45、 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. SAE INTERNATIONAL AMS6435G Page 7 of 7 8.5 Purchase documents should specify not less than the following: AMS6435G Product form and size of the product desired Quantity of product desired. PREPARED BY AMS COMMITTEE “E“
