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/AMS6495AAEROSPACEMATERIALSPECIFICATIONAMS6495 REV. A Issued 2009-10Revised 2011-07 Superseding
5、AMS6495 Steel Bars, Forgings, and Tubing 1.0Cr 2.50Ni 2.0Mo 1.10Si (0.10 0.20C) Premium Aircraft-Quality Electroslag Remelted or Consumable Electrode Vacuum Remelted(Composition similar to UNS K51570) RATIONALEAMS6495A results from a correction of the temperature used for the response to heat treatm
6、ent in 3.4.3. 1. SCOPE 1.1 Form This specification 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 carburized parts requiring high minimum core hardness with a narrow r
7、ange, reduced distortion and subject to stringent magnetic particle inspection standards, but usage is not limited to such applications.1.3 Classification Steel covered by this specification is classified by melting practice as follows: Type 1 Electroslag remelted (ESR) Type 2 Consumable electrode v
8、acuum remelted (VAR) 1.3.1 Unless a specific type is ordered, either type may be supplied. 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
9、 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. Copyright SAE International Provided by IHS under license with SAENot for Resa
10、leNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6495A Page 2 of 7 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2251 Toler
11、ances, Low-Alloy Steel Bars AMS2253 Tolerances, Carbon and Alloy Steel Tubing 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
12、 and Low-Alloy Steel Wrought Products and Forging 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 Identif
13、ication, Forgings 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 Harbor Drive, P. O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.
14、ASTM A 255 Determining Hardenability of Steel ASTM A 370 Mechanical Testing of Steel Products ASTM A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets ASTM E 112 Determining Average Grain Size ASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electric
15、al Steel, Ingot Iron, and Wrought Iron ASTM E 384 Knoop and Vickers 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
16、by other analytical methods acceptable to purchaser. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6495A Page 3 of 7 TABLE 1 - COMPOSITION Element min max Carbon 0.10 0.20 Manganese - 1.00 S
17、ilicon 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 Melting Practice Steel shall be multiple melted using either electroslag reme
18、lt practice (ESR) or vacuum arc consumable electrode practice (VAR) in the remelt cycle (See 1.3). 3.3 Condition The product shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A 370: 3.3.1 Bars 3.3.1.1 Bars 0.500 inch (12.70 mm) an
19、d 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). 3.3.1.2 Bars over 0.500 inch (12.70 mm) in Nominal Diameter or Least Distance Between Parallel Sides
20、Hot 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). 3.3.2 Forgings As ordered. 3.3.3 Mechanical Tubing Cold finished, unless otherwise ordered, hav
21、ing 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). 3.3.4 Forging StockAs ordered by the forging manufacturer. Copyright SAE International Provided by IHS under license
22、with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6495A Page 4 of 7 3.4 PropertiesThe product shall conform to the following requirements; hardness, tensile, and impact testing shall be performed in accordance with ASTM A 370: 3.4.1 Macrostructure Visu
23、al examination of transverse full cross-sections from bars, billets tube rounds, and forging stock, etched in hot hydrochloric acid in accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections for product 36 square inches (232 cm2) and under
24、 in nominal cross-sectional area shall be no worse than the macrographs of ASTM A 604 shown in Table 2. TABLE 2 - MACROSTRUCTURE LIMITS Class Condition Severity 1 Freckles A 2 White Spots 3 Radial Segregation B 4 Ring Pattern 3.4.2 Average Grain Size Shall be ASTM No. 5 or finer determined in accord
25、ance with ASTM E 112. 3.4.3 Response to Heat Treatment Specimens from product shall have the properties 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
26、 below 90 F (32 C) followed by tempering for 2 hours minimum at 570 F 10 (299 C 6). TABLE 3 - MINIMUM LONGITUDINAL MECHANICAL PROPERTIES Property Value Tensile Strength 181 ksi (1250 MPa) Yield Strength 0.2% 138 ksi (950 MPa) Elongation in 4D 12% Charpy Vnotch 52 ft-lb (70 J) 3.5 Quality The product
27、, 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. 3.5.2 Product ordered hot finished or cold finished or ground
28、, 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. 3.5.3 Grain flow of die forgings, except in areas that contain flash-line end grain, shall follow
29、 the general contour of the forgings showing no evidence of reentrant grain flow. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6495A Page 5 of 7 3.6 Tolerances 3.6.1 Bars In accordance with
30、 AMS2251. 3.6.2 Mechanical Tubing In accordance with AMS2253, 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility 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 sam
31、ple and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance TestsComposition (3.1), condition (3.3), macrostructure (3.4.1), average grain size (3.4.2), response to heat treatment (3.4.3), an
32、d tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Frequency-severity cleanliness rating (3.5.1) and grain flow of die forgings (3.5.3) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency
33、 of testing is specified by purchaser. 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 shipment a report showing the results of tests for com
34、position, and macrostructure 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 numbers, AMS6495A, melt practice,
35、 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 Forging Stock In accordance with AMS2370. Copyright SAE International Pro
36、vided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6495A Page 6 of 7 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, straigh
37、t bars and 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 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
38、. 5.2.3 Forging Stock As agreed upon by purchaser and vendor. 5.3 Protective Treatment Bars and mechanical tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipment. 5.4 Packaging The product shall be prepared for shipment in accordance w
39、ith 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 shall mention this specification number and its revision letter in all q
40、uotations 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 (I) located in the left margin is for the convenience of the user in locating areas where
41、 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. Change bars and (R) are not used in original publications, nor in document
42、s that contain editorial changes only. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS6495A Page 7 of 7 8.2 Hardness conversion tables for metals are presented in ASTM E 140. 8.3 Terms used i
43、n AMS are clarified in ARP1917. 8.4 Dimensions and properties in inch/pound units and the Fahrenheit temperatures 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
44、 Purchase documents should specify not less than the following: AMS6495AProduct 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-,-,-
