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 2017 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:/standards.sae.org/AMS6430J AEROSPACEMATERIAL SPECIFICATIONAMS6430 REV. J Issued 1961-01 Revised 2017-08 Supersedi
5、ng AMS6430H Steel, Bars, Forgings, Tubing, and Rings 0.75Mn - 0.78Cr - 1.8Ni - 0.35Mo - 0.20V (0.32 - 0.38C) (4335 Modified) (Composition similar to UNS K33517) RATIONALE AMS6430J results from a Five-Year Review and update of this specification that revises condition (3.2.2), decarburization determi
6、nation (3.3.5), added temsile testing strain rate (3.3.6.1), revises surface quality (3.4.2), testing frequency (4.2), reporting (4.4) and identification (5.2). 1. SCOPE1.1 Form This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, flash wel
7、ded rings, and stock for forging or flash welded rings. 1.2 Application These products have been used typically for heat treated parts, which may be welded during fabrication, requiring through-hardening to high strength levels and which may be used at operational stress levels approaching the yield
8、 strength, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTSThe 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. AMS2251 Tolerances, Low-Alloy Steel Bars AMS2253 Tolerances, Carbon and Alloy Steel Tubing AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2301 Steel Cleanliness, Aircraft Quality, Magne
11、tic Particle Inspection Procedure SAE INTERNATIONAL AMS6430J Page 2 of 9 AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock AMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Forgings AMS2806 Identification, Bars, Wir
12、e, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys AMS2808 Identification, Forgings AMS7496 Rings, Flash Welded, Carbon and Low-Alloy Steels ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS1182 Standard Stock Remo
13、val Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing 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 the Hardenability of S
14、teel ASTM A370 Mechanical Testing of Steel Products ASTM E45 Determining the Inclusion Content of Steel ASTM E112 Determining Average Grain Size ASTM E140 Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardn
15、ess, Scleroscope Hardness, and Leeb Hardness ASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E381 Macroetch Testing Steel Bars, Billets, Blooms, and Forgings ASTM E384 Microindentation Hardness of Materials 3. TECHNICAL REQUIR
16、EMENTS 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. SAE INTERNATIONAL AMS6430J Page 3 of 9 Table 1 - Composition Elemen
17、t Min Max Carbon Manganese Silicon Phosphorus Sulfur Chromium Nickel Molybdenum Vanadium Copper 0.32 0.60 0.40 - - 0.65 1.65 0.30 0.17 - 0.38 0.90 0.60 0.015 0.015 0.90 2.00 0.40 0.23 0.35 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Condition Th
18、e product shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A370: 3.2.1 Bars Bar shall not be cut from plate. (also see 4.4.2.) 3.2.1.1 Bars 0.500 Inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Si
19、des Cold finished having tensile strength not higher than 140 ksi (965 MPa), or equivalent hardness (see 8.2). 3.2.1.2 Bars Over 0.500 Inch (12.70 mm) in Nominal Diameter or Least Distance Between Parallel Sides Hot finished and annealed, unless otherwise ordered, having hardness not higher than 248
20、 HB, or equivalent (see 8.3). Bars ordered cold finished may have hardness as high as 262 HB, or equivalent (see 8.3). 3.2.2 Forgings and Flash Welded Rings Normalized at 1600 F to 1700 F ( 871 C to 927 C) and tempered to a hardness not higher than 269 HB, or equivalent (see 8.3). 3.2.2.1 Flash weld
21、ed rings shall not be supplied unless specified or permitted on purchasers part drawing. When supplied, rings shall be manufactured in accordance with AMS7496. 3.2.3 Mechanical Tubing Cold finished, unless otherwise ordered, having hardness not higher than 25 HRC, or equivalent (see 8.3). Tubing ord
22、ered hot finished and annealed shall have hardness not higher than 99 HRB, or equivalent (see 8.3). 3.2.4 Stock for Forging or Flash Welded Rings As ordered by the forging or flash welded ring manufacturer. 3.3 Properties The product shall conform to the following requirements; hardness and tensile
23、testing shall be performed in accordance with ASTM A370: SAE INTERNATIONAL AMS6430J Page 4 of 9 3.3.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets, tube rounds, and stock for forging or flash welded rings, etched in hot hydrochloric acid, in accordance with
24、ASTM E381, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the ASTM E381 macrograph ratings shown in Table 2. Table 2 - Macrostructure limits Cross-Sectional Area Square Inches Cross-Sectional Area Square Centimeters Macrographs Up to 3
25、6, incl Up to 232, incl S2 - R1 - C2 Over 36 to 133, incl Over 232 to 858. incl S2 - R2 C3 Over 133 Over 858 Note 1 Note 1 Limits for larger sizes shall be agreed upon by purchaser and producer. The purchaser shall have written approval of the agreement from the cognizant engineering organization 3.
26、3.1.1 Macrostructure examination is not required for hollow tubes that are produced directly from ingots or blooms unless specified by purchaser, in which case the purchaser shall specify standards to be used. 3.3.2 Micro-Inclusion Ratings of Each Heat At least one specimen from each ingot tested, a
27、s well as two-thirds of the total number of specimens and the average of all specimens, shall not exceed the limits shown in Table 3, 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 3 - Micro-inclusion ra
28、ting limits Type A B C D Thin 2.0 2.0 3.0 3.0 Heavy 2.0 2.0 2.0 2.0 3.3.3 Average Grain Size of Bars, Forgings, Tubing and Flash Welded Rings Shall be ASTM No. 5 or finer, determined in accordance with ASTM E112. 3.3.4 Hardenability of Each Heat Shall be J1/16 inch (1.6 mm) = 58 HRC maximum and J15/
29、16 inch (23.8 mm) = 48 HRC minimum , determined on the standard end-quench test specimen in accordance with ASTM A255, except that the steel shall be normalized at 1700 F 10 F (927 C 6 C) and the test specimen austenitized at 1625 F 10 F (885 C 6 C). 3.3.5 Decarburization 3.3.5.1 Bars, rings, and tu
30、bing ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces. Decarburization on tubing ID shall not exceed the maximum depth specified in Table 5. 3.3.5.2 Allowable decarburization of bars, billets, and tube rounds ordered for redrawing, fo
31、rging, or flash welding or to specified microstructural requirements shall be as agreed upon by purchaser and producer. 3.3.5.3 Decarburization of bars and flash welded rings that 3.3.5.1 or 3.3.5.2 is not applicable shall be not greater than shown in Table 4. SAE INTERNATIONAL AMS6430J Page 5 of 9
32、Table 4 Table 4A - Maximum depth of decarburization, inch/pound units Nominal Diameter or Distance Between Parallel Sides Inches Total Depth of Decarburization Inch Up to 0.375, incl Over 0.375 to 0.500, incl Over 0.500 to 0.625, incl Over 0.625 to 1.000, incl Over 1.000 to 1.500, incl Over 1.500 to
33、 2.000, incl Over 2.000 to 2.500, incl Over 2.500 to 3.000, incl Over 3.000 to 4.000, incl 0.010 0.012 0.014 0.017 0.020 0.025 0.030 0.035 0.045 Table 4B - Maximum depth of decarburization, SI units Nominal Diameter or Distance Between Parallel Sides Millimeters Total Depth of Decarburization Millim
34、eters Up to 9.52, incl Over 9.52 to 12.70, incl Over 12.70 to 15.88, incl Over 15.88 to 25.40, incl Over 25.40 to 38.10, incl Over 38.10 to 50.80, incl Over 50.80 to 63.50, incl Over 63.50 to 76.20, incl Over 76.20 to 101.60, incl 0.25 0.30 0.36 0.43 0.51 0.64 0.76 0.89 1.14 3.3.5.4 Decarburization
35、of tubing that 3.3.5.1 or 3.3.5.2 is not applicable shall be not greater than shown in Table 5. Table 5 Table 5A - Maximum depth of decarburization, inch/pound units Nominal Wall Thickness Inches Total Depth of Decarburization Inch ID Total Depth of Decarburization Inch OD Up to 0.109, incl Over 0.1
36、09 to 0.203, incl Over 0.203 to 0.400, incl Over 0.400 to 0.600, incl Over 0.600 to 1.000, incl Over 1.000 0.008 0.010 0.012 0.015 0.017 0.020 0.015 0.020 0.025 0.030 0.035 0.040 SAE INTERNATIONAL AMS6430J Page 6 of 9 Table 5B - Maximum depth of decarburization, SI units Nominal Wall Thickness Milli
37、meters Total Depth of Decarburization Millimeter ID Total Depth of Decarburization Millimeters OD Up to 2.77, incl Over 2.77 to 5.16, incl Over 5.16 to 10.16, incl Over 10.16 to 15.24, incl Over 15.24 to 25.40, incl Over 25.40 0.20 0.25 0.30 0.38 0.43 0.51 0.38 0.51 0.64 0.76 0.89 1.02 3.3.5.5 Decar
38、burization shall be evaluated by one of the two methods of 3.3.5.5.1 or 3.3.5.5.2, selected at the discretion of the producer. 3.3.5.5.1 Metallographic Method A cross section taken perpendicular to the surface shall be prepared, etched, and visually examined metallographically at a magnification not
39、 to exceed 100X. The product shall not show a layer of complete (ferrite) or partial decarburization exceeding the limits of Tables 3 and 4. 3.3.5.5.2 Hardness Traverse Method The total depth of decarburization shall be determined by a traverse method using microindentation hardness testing in accor
40、dance 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 under that surfac
41、e 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 Tables 3 and 4. 3.3.5.5.3 When determining the depth of decarburization, it is p
42、ermissible 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. 3.3.5.5.4 In case of dispute, the total depth of decarburization determined using the microindentation hard
43、ness traverse method shall govern. 3.3.6 Response to Heat Treatment Tensile specimens shall meet the requirements shown in Table 6 after being hardened by heating to 1625 F 25 F (885 C 14 C), holding at heat for 60 minutes 5, and quenching in oil and tempered by heating to not lower than 700 F (371
44、C), holding at heat for not less than 2 hours, and cooling in air (see 4.3). Table 6 - Minimum tensile properties Property Value Tensile Strength 205 ksi (1413 MPa) Yield Strength at 0.2% Offset 190 ksi (1310 MPa) Elongation in 4D Longitudinal 10% Transverse (See 8.6) 7% SAE INTERNATIONAL AMS6430J P
45、age 7 of 9 3.3.6.1 Unless otherwise specified, the strain rate shall be set at 0.005 inch/inch/minute (0.005 mm/mm/minute) and maintained within a tolerance of 0.002 inch/inch/minute (0.002 mm/mm/minute) through 0.2% offset yield strain. After the yield strain, the speed of the testing machine shall
46、 be set between 0.05 and 0.5 in./in. (mm/mm).of the length of the reduced section (or distance between the grips for specimens not having a reduced section) per minute. Alternatively, an extensometer and strain rate indicator may be used to set the strain rate between 0.05 and 0.5 in./in./min (mm/mm
47、/minute). 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. 3.4.2 Bars and mechanical tubing sha
48、ll be free from seams, laps, tears, and cracks after removal of the standard stock removal allowance in accordance with AS1182. 3.4.3 Grain flow of die forgings, except in areas that contain flash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain
49、 flow. 3.5 Tolerances 3.5.1 Bars Shall conform to all applicable requirements of AMS2251. 3.5.2 Mechanical Tubing Shall conform to all applicable requirements of AMS2253. 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
