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 theref
2、rom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication ma
3、y 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: +1 724-776-4970 (outside US
4、A) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS6494AAEROSPACEMATERIALSPECIFICATIONAMS6494 REV. A Issued 2009-09Revised 2011-07 Superseding
5、AMS6494 Steel Bars, Forgings, and Tubing 1.0Cr 2.50Ni 2.0Mo 1.10Si (0.10 0.20C) Aircraft-Quality(Composition similar to UNS K51570) RATIONALEAMS6494A results from a correction of the temperature used for the response to heat treatment in 3.3.3. 1. SCOPE 1.1 Form This specification covers an aircraft
6、-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 carburized parts requiring high minimum core hardness with a narrow range, reduced distortion and subject to magnetic particle inspection standar
7、ds, 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 supplier may work to a subsequent revision of a document unless a specifi
8、c 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: 877-606
9、-7323 (inside USA and Canada) or 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, Magnetic Partic
10、le Inspection Procedure Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6494A Page 2 of 6 AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forgin
11、g Stock AMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel ForgingsAMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys AMS2808 Identification, Forgings AS1182 Standard Stock Removal
12、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 A 255 Determining Hardenability of Steel AST
13、M A 370 Mechanical Testing of Steel Products ASTM E 381 Macroetch Testing Steel Bars, Billets, Blooms and Forgings 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 384 Knoop and Vick
14、ers Hardness of Materials 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the following percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. TABLE 1 - C
15、OMPOSITION Element min max Carbon 0.10 0.20 Manganese - 1.00 Silicon 0.90 1.30 Phosphorus - 0.020 Sulfur - 0.015 Chromium 0.80 1.20 Nickel 2.30 2.70 Molybdenum 1.70 2.20 Vanadium - 0.50 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Condition The p
16、roduct shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A 370: Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6494A Page
17、 3 of 6 3.2.1 Bars 3.2.1.1 Bars 0.500 inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel SidesCold finished having tensile strength not higher than 138 ksi (950 MPa) or hardness not higher than 285 HB or equivalent (See 8.2). 3.2.1.2 Bars over 0.500 inch (12.70 mm) in N
18、ominal Diameter or Least Distance Between Parallel SidesHot finished and annealed, unless otherwise ordered, having hardness not higher than 285 HB or equivalent (See 8.2). Bars ordered cold finished may have hardness as high as 310 HB or equivalent (See 8.2). 3.2.2 Forgings As ordered. 3.2.3 Mechan
19、ical Tubing Cold finished, unless otherwise ordered, having hardness not higher than 285 HB, or equivalent (See 8.2). Tubing ordered hot finished and annealed or tempered shall have hardness not higher than 285 HB or equivalent (See 8.2). 3.2.4 Forging Stock As ordered by the forging manufacturer. 3
20、.3 Properties The product shall conform to the following requirements; hardness, tensile, and impact testing shall be performed in accordance with ASTM A 370: 3.3.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets tube rounds, and forging stock, etched in hot hy
21、drochloric acid in accordance with 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 Cross-Section Area Square Inches Cross-Section Area Square Ce
22、ntimeters Macrographs Up to 36, incl Up to 232, incl S2 - R1 - C2 Over 36 to 100, incl Over 232 to 645, incl S2 - R2 - C3 3.3.2 Average Grain Size Shall be ASTM No. 5 or finer determined in accordance with ASTM E 112. 3.3.3 Response to Heat Treatment Specimens from the product shall have the propert
23、ies shown in Table 3 after being austenitized by heating to 1760 F 25 (960 C 14), holding at heat for a time commensurate with section thickness, heating equipment, and procedure used, oil quenched to below 90 F (32 C) followed by tempering for 2 hours minimum at 570 F 10 (299 C 6). Copyright SAE In
24、ternational Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6494A Page 4 of 6 TABLE 3 - MINIMUM LONGITUDINAL MECHANICAL PROPERTIES Property Value Tensile Strength 181 ksi (1250 MPa) Yield Strength 0.2% 138 ksi (950 MPa)
25、Elongation in 4D 12% Charpy Vnotch 37 ft-lb (50 J) 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 AMS2
26、301. 3.4.2 Product ordered hot finished or cold finished 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 ground, turned, or polished surface. 3.4.3 Grain flow of die forging
27、s, except in areas that contain flash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow. 3.5 Tolerances 3.5.1 Bars In accordance with AMS2251. 3.5.2 Mechanical Tubing In accordance with AMS2253, 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibi
28、lity for inspection The vendor of the product 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 product conforms to specifie
29、d requirements. 4.2 Classification of Tests 4.2.1 Acceptance TestsComposition (3.1), condition (3.2), macrostructure (3.3.1), average grain size (3.3.2), response to heat treatment (3.3.3), frequency-severity rating (3.4.1), and tolerances (3.5) are acceptance tests and shall be performed on each he
30、at or lot as applicable.4.2.2 Periodic Tests Grain flow of die forgings (3.4.3) is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo re
31、production or networking permitted without license from IHS-,-,-SAE AMS6494A Page 5 of 6 4.3 Sampling and Testing 4.3.1 Bars, Mechanical Tubing, and Forging Stock In accordance with AMS2370. 4.3.2 Forgings In accordance with AMS2372. 4.4 Reports The vendor of the product shall furnish with each ship
32、ment a report showing the results of tests for composition macrostructure, and frequency-severity cleanliness 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
33、 shall include the purchase order number, heat and lot numbers, AMS6494A, product form and size or part number, and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included. 4.5 Resampling and Retesting 4.5.1 Bars, Mechanical Tubing, and
34、Forging Stock In accordance with AMS2370. 4.5.2 Forgings In accordance with AMS2372. 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, straight bars and tubing will be acceptable in mill lengths of 6 to 20 feet (1.8 to 6.1 m) but not more than
35、 10% of any shipment shall be supplied in lengths shorter than 10 feet (3 m). 5.2 Identification 5.2.1 Bars and Mechanical Tubing In accordance with AMS2806. 5.2.2 Forgings In accordance with AMS2808. 5.2.3 Forging Stock As agreed upon by purchaser and vendor. 5.3 Protective Treatment Bars and mecha
36、nical tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipment. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6494A Page 6 of 6
37、 5.4 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 vendor
38、 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) located in th
39、e 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 revisions. Ch
40、ange 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 E 140. 8.3 Terms used in AMS are clarified in ARP1917. 8.4 Dimensions and properties in inch/pound units and the Fahrenheit t
41、emperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents for the primary units and are presented only for information. 8.5 Purchase documents should specify not less than the following: AMS6494AProduct form and size or part number of product desired Quantity of product desired. PREPARED BY AMS COMMITTEE “E” Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
