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/AMS6281J AEROSPACE MATERIAL SPECIFICATION AMS6281 REV. J Issued 1945-10 Revised 2
5、006-05 Reaffirmed 2015-05 Superseding AMS6281H Steel, Mechanical Tubing 0.50Cr - 0.55Ni - 0.20Mo (0.28 - 0.33C) (SAE 8630) (Composition similar to UNS G86300) RATIONALE AMS6281J has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE 1.1 Form This specification covers an aircraf
6、t-quality, low-alloy steel in the form of mechanical tubing. 1.2 Application This product has been used typically for parts, with section thickness of 0.50 inch (12.7 mm) and under at time of heat treatment, requiring a through-hardening steel capable of developing hardness as high as 35 HRC, and fo
7、r parts of greater thickness requiring proportionately lower hardness, 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 herein. The suppli
8、er 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 from SAE Internation
9、al, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), or www.sae.org. AMS 2253 Tolerances, Carbon and Alloy Steel Tubing AMS 2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS 2301 Steel Cleanliness,
10、Aircraft-Quality, Magnetic Particle Inspection Procedure AMS 2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel, Wrought Products and Forging Stock AMS 2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant St
11、eels and Alloys AS1182 Standard Machining 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, or www.astm.org. AS
12、TM A 255 End-Quench Test for Hardenability of Steel ASTM A 370 Mechanical Testing of Steel Products ASTM E 112 Determining Average Grain Size ASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E 381 Macroetch Testing, Steel Bars
13、, Billets, Blooms, and Forgings ASTM E 384 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 E 350, by spectrochemical methods, or by other analytic
14、al methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min max Carbon Manganese Silicon Phosphorus Sulfur Chromium Nickel Molybdenum Copper 0.28 0.70 0.15 - - 0.40 0.40 0.15 - 0.330.900.350.0250.0250.600.700.250.35 3.1.1 Check Analysis Composition variations shall meet the applicable requ
15、irements of AMS 2259. 3.2 Condition Cold finished, unless otherwise ordered, having hardness not higher than 25 HRC, or equivalent (See 8.2). Tubing ordered hot finished and annealed or tempered shall have hardness not higher than 99 HRB, or equivalent (See 8.2). Hardness shall be determined in acco
16、rdance with ASTM A 370. 3.3 Properties Tubing shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A 370: 3.3.1 Macrostructure Visual examination of full cross-sections from billets, or tube rounds, etched in hot hydrochloric acid in accordance wit
17、h ASTM E 381, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM E 381, shown in Table 2. TABLE 2 - MACROSTRUCTURE LIMITS Section Size Square Inches Section Size Square Centimeters Macrographs Up to 36, incl Over 36
18、 to 100, incl Up to 232, incl Over 232 to 645, incl S2 - R1 - C2 S2 - R2 - C3 SAE INTERNATIONAL AMS6281J Page 2 of 5_ 3.3.2 Average Grain Size Shall be ASTM No. 5 or finer, determined in accordance with ASTM E 112. 3.3.3 Hardenability Shall be J 5/16 inch (7.9 mm) = 35 HRC minimum and J 8/16 inch (1
19、2.7 mm) = 28 HRC minimum, determined on the standard end-quench test specimen in accordance with ASTM A 255 except that the steel shall be normalized at 1650 F 10 (899 C 6) and the test specimen austenitized at 1600 F 10 (871 C 6). 3.3.4 Decarburization 3.3.4.1 Tubing ordered ground, turned, or poli
20、shed 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 3. 3.3.4.1 Allowable decarburization of pierced billets, of tube rounds or tubing for redrawing or forging, or of tubing ordered to
21、specified microstructural requirements, shall be as agreed upon by purchaser and vendor. 3.3.4.2 Decarburization of tubing to which 3.3.4.1 or 3.3.4.2 is not applicable shall not be greater than shown in Table 3. TABLE 3A - MAXIMUM DECARBURIZATION, INCH/POUND UNITS Nominal Wall Thickness Inches Tota
22、l Depth of Decarburization, Inch ID Total Depth of Decarburization, Inch OD Up to 0.109, incl Over 0.109 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 TABLE 3B - MAXIMUM
23、DECARBURIZATION, SI UNITS Nominal Wall Thickness Millimeters 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.
24、38 0.43 0.51 0.38 0.51 0.64 0.76 0.89 1.02 3.3.4.3 Decarburization shall be measured by the metallographic method, by HR 30N scale hardness testing method, or by a traverse method using microhardness testing in accordance with ASTM E 384. The hardness method(s) shall be conducted on a hardened but u
25、ntempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization, when measured by a hardness method, is defined as the perpendicular distance from the surface to the depth under that surface below which there is no further increase in hardnes
26、s. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by any decarburization on the adjacent surface. In case of dispute, the depth of decarburization determined using the microhardness traverse method shall govern. 3.3.4.3.1 When determining the depth of decarbu
27、rization, 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. SAE INTERNATIONAL AMS6281J Page 3 of 5_ 3.4 Quality Tubing, as received by the purchaser,
28、shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the tubing. 3.4.1 Steel shall be aircraft-quality conforming to AMS 2301. 3.4.2 Mechanical tubing ordered hot rolled or cold drawn, or ground, turned, or polished shall, a
29、fter removal of the standard machining allowance in accordance with AS1182, be free of seams, laps, tears, and cracks open to the ground, turned, or polished surface. 3.5 Tolerances Shall conform to all applicable requirements of AMS 2253. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspe
30、ction The vendor of tubing shall supply all samples for vendors 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 tubing conforms to specified requirements. 4.2
31、Classification of Tests All technical requirements are acceptance tests and shall be performed on each heat or lot as applicable. 4.3 Sampling and Testing Shall be in accordance with AMS 2370. 4.4 Reports The vendor shall furnish with each shipment a report showing the results of tests for compositi
32、on, macrostructure, hardenability, and frequency-severity cleanliness rating of each heat, and for 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 numbers, AMS 62
33、81J, size, and quantity. 4.5 Resampling and Retesting Shall be in accordance with AMS 2370. 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, tubing will be acceptable in mill lengths of 6 to 20 feet (1.8 to 6.1 m) but not more than 10% of any
34、 shipment shall be supplied in lengths shorter than 10 feet (3 m). 5.2 Identification Shall be in accordance with AMS 2806. 5.3 Protective Treatment Tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipment. SAE INTERNATIONAL AMS6281J Pag
35、e 4 of 5_ 5.4 Packaging Tubing 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 tubing to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGEMENT A ve
36、ndor shall mentions this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Tubing not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (|) located
37、in the left margin is for the convenience of the user in locating areas where technical revision, not editorial changes, have been made to the previous issue of a specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technical re
38、vision. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only. 8.2 Hardness conversion tables for metals are presented in ASTM E 140. 8.3 Terms used in AMS are clarified in ARP1917. 8.4 Dimensions and properties in inch/pound units and t
39、he 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 specify not less than the following: AMS 6281J Size of tubing desired Quantity of tubing desired. 8.6 Key Words Steel, mechanical tubing, 0.28 - 0.33C, SAE 8630, UNS G86300 PREPARED BY AMS COMMITTEE “E” SAE INTERNATIONAL AMS6281J Page 5 of 5_
