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/AMS6482A AEROSPACE MATERIAL SPECIFICATION AMS6482 REV. A Issued 2012-01 Revised 2
5、015-07 Superseding AMS6482 Steel Bars, Forgings, and Tubing 1.5Si - 1.25Cr - 3.8Ni - 0.50Mo - 0.30V (0.40C) Vacuum Remelted Annealed (Composition similar to UNS K63835) RATIONALE AMS6482A corrects the condition in the title, revises decarburization and reporting. 1. SCOPE 1.1 Form This specification
6、 covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock. 1.2 Application These products have been used typically for parts requiring high strength and high toughness, but usage is not limited to such applications. 1.2.1 Certain design a
7、nd processing procedures may cause these products to become susceptible to stress-corrosion cracking after heat treatment; ARP1110 recommends practices to minimize such occurrences. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part
8、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 been cancelled and no superseding document has been specified, the last published issue of that document
9、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), www.sae.org. AMS2251 Tolerances, Low-Alloy Steel Bars AMS2253 Tolerances, Carbon and Alloy Steel Tubing S
10、AE INTERNATIONAL AMS6482A Page 2 of 9 AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2300 Steel Cleanliness, Premium Aircraft-Quality, Magnetic Particle Inspection Procedure AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel, Wrought Products a
11、nd Forging Stock AMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Forgings AMS2750 Pyrometry AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys AMS2808 Identification, Forgings AR
12、P1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corrosion Resistant Steels and Alloys AS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing 2.2 ASTM Publications Available from ASTM International, 100 Barr Ha
13、rbor 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 E45 Determining the Inclusion Content of Steel ASTM E112 Determining A
14、verage 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 Table 1, determined b
15、y wet chemical methods in accordance with ASTM E350, by spectrochemical, or by other analytical methods approved by purchaser. Table 1 - Composition Element min max Carbon 0.33 0.43 Manganese 0.75 1.25 Silicon 1.35 2.25 Phosphorus - 0.010 Sulfur - 0.003 Chromium 1.10 2.00 Nickel 3.00 4.10 Molybdenum
16、 0.40 0.90 Vanadium 0.10 0.40 Copper 0.40 0.90 SAE INTERNATIONAL AMS6482A Page 3 of 9 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Melting Practice Steel shall be multiple melted using vacuum consumable electrode practice in the remelt cycle. 3.3
17、 Condition The product shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A370: 3.3.1 Bars and Tubing Annealed at 1250 F 25 (677 C 15). Pyrometry shall be in accordance with AMS2750. 3.3.1.1 Bars Hardness shall be not higher than 4
18、5 HRC or equivalent tensile strength (See 8.2). Bar shall not be cut from plate. 3.3.1.2 Mechanical Tubing Tubing shall have hardness not higher than 45 HRC or equivalent (See 8.3). 3.3.2 Forgings Annealed at 1250 F 25 (677 C 15) to hardness not higher than 45 HRC, or equivalent (See 8.3). 3.3.3 For
19、ging Stock As ordered by the forging manufacturer. 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 from bars, billets, tube rounds, or
20、forging stock, etched in hot hydrochloric acid in accordance with ASTM A604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM A604 shown in Table 2. Table 2 - Macrostructure limits Class Condition Severity 1 Freck
21、les A 2 White Spots A 3 Radial Segregation B 4 Ring Pattern B SAE INTERNATIONAL AMS6482A Page 4 of 9 3.4.2 Micro-Inclusion Rating of Each Heat No specimen shall exceed the limits shown in Table 3, determined in accordance with ASTM E45, Method D. Table 3 - Micro-inclusion rating limits Type A Thin A
22、 Heavy B Thin B Heavy C Thin C Heavy D Thin D Heavy Worst Field Severity 1.5 1.0 1.0 1.0 1.0 1.0 1.5 1.0 Worst Field Frequency, maximum a 1 a 1 a 1 3 1 Total Rateable Fields, Frequency, maximum b 1 b 1 b 1 8 1 a - Combined A+B+C, not more than 3 fields b - Combined A+B+C, not more than 8 fields 3.4.
23、2.1 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 with ASTM E45. 3.4.3 Average Grain Size of Bar, Forgings, and Tubing Shall be ASTM 6 or finer, determined in accordance with ASTM E112. 3.4.4 Decarburization 3.4.4.1 Bars
24、 and tubing 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. 3.4.4.2 Allowable decarburization of bars, billets, and tube rounds ordered for redraw
25、ing or forging or to specified microstructural requirements shall be as agreed upon by purchaser and producer. 3.4.4.3 Decarburization of bars to which 3.4.4.1 or 3.4.4.2 is not applicable shall be not greater than shown in Table 4. Table 4A - Maximum total depth of decarburization, inch/pound units
26、 Nominal Diameter or Distance Between Parallel Sides Inches Total Depth of Decarburization Inch Up to 0.375, incl 0.010 Over 0.375 to 0.500, incl 0.012 Over 0.500 to 0.625, incl 0.014 Over 0.625 to 1.000, incl 0.017 Over 1.000 to 1.500, incl 0.020 Over 1.500 to 2.000, incl 0.025 Over 2.000 to 2.500,
27、 incl 0.030 Over 2.500 to 3.000, incl 0.035 Over 3.000 to 5.000, incl 0.045 SAE INTERNATIONAL AMS6482A Page 5 of 9 Table 4B - Maximum total depth of decarburization, SI units Nominal Diameter or Distance Between Parallel Sides Millimeters Total Depth of Decarburization Millimeters Up to 9.52, incl 0
28、.25 Over 9.52 to 12.70, incl 0.30 Over 12.70 to 15.88, incl 0.36 Over 15.88 to 25.40, incl 0.43 Over 25.40 to 38.10, incl 0.51 Over 38.10 to 50.80, incl 0.64 Over 50.80 to 63.50, incl 0.76 Over 63.50 to 76.20, incl 0.89 Over 76.20 to 127.00, incl 1.14 3.4.4.4 Decarburization of tubing to which 3.4.4
29、.1 or 3.4.4.2 is not applicable shall be not greater than shown in Table 5. Table 5A - Maximum total depth of decarburization, inch/pound units Nominal Wall Thickness Inches Total Depth of Decarburization Inches ID Total Depth of Decarburization Inches OD Up to 0.109, incl 0.008 0.015 Over 0.109 to
30、0.203, incl 0.010 0.020 Over 0.203 to 0.400, incl 0.012 0.025 Over 0.400 to 0.600, incl 0.015 0.030 Over 0.600 to 1.000, incl 0.017 0.035 Over 1.000 0.020 0.040 Table 5B - Maximum total depth of decarburization, SI units Nominal Wall Thickness Millimeters Total Depth of Decarburization Millimeters I
31、D Total Depth of Decarburization Millimeters OD Up to 2.77, incl 0.20 0.38 Over 2.77 to 5.16, incl 0.25 0.51 Over 5.16 to 10.16, incl 0.30 0.64 Over 10.16 to 15.24, incl 0.38 0.76 Over 15.24 to 25.40, incl 0.43 0.89 Over 25.40 0.51 1.02 3.4.4.5 Decarburization shall be evaluated by one of the two me
32、thods of 3.4.4.5.1 or 3.4.4.5.2. 3.4.4.5.1 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 (including complete decarburizaion fer
33、rite plus partial decarburization) shall not exceed the limits of Tables 4 and 5. 3.4.4.5.2 Hardness Traverse Method The total depth of decarburization shall be determined by a traverse method using microhardness testing in accordance with ASTM E384, at a magnification not exceeding 100X, conducted
34、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
35、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 Tables 4 and 5. SAE INTERNATIONAL AMS6482A Page 6 of 9 3.4.4.5.2.1 When determining the depth of decarburization, it is permissible to disregard local
36、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 inches (1.65 mm) or less. 3.4.4.5.3 In case of dispute, the total depth of decarburization determined using the microhardness traverse method shall govern. 3.4.5
37、 Response to Heat Treatment of Bars, Forgings, and Tubing Specimens shall conform to the following requirements after being austenitized by heating to 1685 F 25 (918 C 14), holding at heat for 1 hour and 30 minutes 5 minutes, and quenching in oil; cooled to -100 F (-73 C) or colder, holding at tempe
38、rature for not less than 1 hour, warming in air to room temperature, and tempered by heating to 500 F 10 (260 C 6) holding at heat for 2 hours 0.2, cooling in air to room temperature. 3.4.5.1 Longitudinal Tensile Properties Shall meet the properties in Table 6. Table 6 - Minimum longitudinal tensile
39、 properties Property Value Tensile Strength 282 ksi (1944 MPa) Yield Strength at 0.2% Offset 226 ksi (1558 MPa) Elongation in 4D 9% 3.4.5.2 Longitudinal Impact Toughness For bars 0.625 inch and larger, the minimum Charpy V-notch impact toughness, when tested at room temperature in accordance with AS
40、TM A370, shall be 11 foot-pounds. 3.5 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. 3.5.1 Steel shall be premium aircraft-quality conforming to AMS2300. 3.5.
41、2 Bars and tubing ordered hot rolled or cold drawn, or ground, turned, or polished shall, after removal of the standard stock removal allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the machined, ground, turned, or polished surface. 3.6 Tolerances Shall confo
42、rm to all applicable requirements of the following: 3.6.1 Bars In accordance with AMS2251. 3.6.2 Mechanical Tubing In accordance with AMS2253. SAE INTERNATIONAL AMS6482A Page 7 of 9 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples
43、 for producers tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and 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 Comp
44、osition (3.1), condition (3.3), macrostructure (3.4.1), micro-inclusion rating (3.4.2), average grain size (3.4.3), decarburization (3.4.4) and response to heat treatment (3.4.5) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Frequency-severity ra
45、ting (3.5.1) is a periodic test and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be as follows: 4.3.1 Bars, Mechanical Tubing, and Forging Stock In accordance with AMS2370. 4.3.2 Forgings In accordanc
46、e with AMS2372. 4.4 Reports 4.4.1 The producer of bars, forgings, and mechanical tubing 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 operations) and the results of test
47、s for composition, macrostructure and micro-inclusion rating of each heat and for condition, average grain size and response to heat treatment 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 num
48、bers, AMS6482A, product form and size (and/or part number, if applicable), and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included. 4.4.2 Report the nominal metallurgically worked cross sectional size and the cut size, if different (
49、Also see 3.3.1.1). 4.4.3 The producer of forging stock 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 operations) and the results of tests for composition, macrostructure, and micro-inclusion rating of each heat and the results of any additional property requirements
