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 2016 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/AMS6495B AEROSPACE MATERIAL SPECIFICATION AMS6495 REV. B Issued 2009-10 Revised 2
5、016-07Superseding AMS6495A 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) RATIONALE AMS6495B is a Five Year Review and update of this specification that
6、revises macrostructure and reporting. 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
7、hardness with a narrow range, 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
8、 2 Consumable electrode vacuum 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
9、 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. SAE INTERNATIONAL AMS6495B Page 2 of 7 2.1 SAE Public
10、ations 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 AMS2259 Chemical Check Analys
11、is 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 and Forging Stock AMS2372 Quality Assurance Sampling and Testing Carbon
12、 and Low-Alloy Steel Forgings AMS2806 Identification Bars, Wire, Mechanical Tubing, and Extrusions Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys AMS2808 Identification Forgings ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS1182 Standard Stock R
13、emoval 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 A370 Mechanical Testing of Steel Prod
14、ucts ASTM A604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets ASTM E112 Determining Average Grain Size ASTM E140 Hardness Conversion Tables for Metals ASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel,Ingot Iron, and Wrought Iron ASTM E
15、384 Knoop and Vickers Hardness of Materials SAE INTERNATIONAL AMS6495B Page 3 of 7 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 E350, by spectrochemical methods, or by other
16、 analytical methods acceptable to purchaser. Table 1 - Composition 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
17、 applicable requirements of AMS2259. 3.2 Melting Practice Steel shall be multiple melted using either electroslag remelt 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 an
18、d tensile strength shall be determined in accordance with ASTM A370: 3.3.1 Bars Bar shall not be cut from plate (also see 4.4.2). 3.3.1.1 Bars 0.500 inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides Cold finished having tensile strength not higher than 138 ksi (9
19、50 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 Hot finished and annealed, unless otherwise ordered, having hardness not higher than 285 HB or equivalent (see 8.2). Bars ordered c
20、old 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, having hardness not higher than 285 HB, or equivalent (see 8.2). Tubing ordered hot finished and annealed or tempered shall have hardn
21、ess not higher than 285 HB or equivalent (see 8.2). 3.3.4 Forging Stock As ordered by the forging manufacturer. SAE INTERNATIONAL AMS6495B Page 4 of 7 3.4 Properties The product shall conform to the following requirements; hardness, tensile, and impact testing shall be performed in accordance with A
22、STM A370: 3.4.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets tube rounds, and 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 wo
23、rse than the macrographs of ASTM A604 shown in Table 2. Table 2 - Macrostructure limits Class Condition Severity 1 Freckles A 2 White Spots A 3 Radial Segregation B 4 Ring Pattern B 3.4.2 Average Grain Size of Bars, Mechanical Tubing and Forgings Shall be ASTM No. 5 or finer determined in accordance
24、 with ASTM E112. 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 F (960 C 14 C), holding at heat for a time commensurate with section thickness, heating equipment, and procedure used, oil quenched to
25、below 90 F (32 C) followed by tempering for 2 hours minimum at 570 F 10 F (299 C 6 C). 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 prod
26、uct, 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 Bars and mechanical tubing shall be free from seams,
27、 laps, tears, and cracks after removal of the standard stock removal allowance in accordance with AS1182. 3.5.3 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 flow. SAE INTERNATION
28、AL AMS6495B Page 5 of 7 3.6 Tolerances 3.6.1 Bars In accordance with AMS2251. 3.6.2 Mechanical Tubing In accordance with 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 th
29、e 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 specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), condition (3.3), macrostructure (3
30、.4.1), average grain size (3.4.2), response to heat treatment (3.4.3), and 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
31、shall be performed at a frequency selected by the producer unless frequency 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 4.4.1 The producer of bars, f
32、orgings and mechanical tubing shall furnish with each shipment a report showing producer identity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations), the results of tests for composition, and macrostructure of each heat, and for condi
33、tion, 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, AMS6495B, melt practice, product form and size or part number, and quantity. If
34、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 (also see 3.2.1). 4.4.3 The producer of forging stock shall furnish with each shipment a repo
35、rt showing 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 frequency-severity rating of each heat and the results of any additional property requiremen
36、ts imposed by the purchase order (see 8.5). This report shall include the purchase order number, heat number, AMS6495B, size and quantity. SAE INTERNATIONAL AMS6495B Page 6 of 7 4.5 Resampling and Retesting 4.5.1 Bars, Mechanical Tubing, and Forging Stock In accordance with AMS2370. 4.5.2 Forgings I
37、n 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 10% of any shipment shall be supplied in lengths shorter
38、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 producer. 5.3 Protective Treatment Bars and mechanical tubing ordered cold drawn, cold rolled, ground, tu
39、rned, or polished shall be protected from corrosion prior to shipment. 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 e
40、nsure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A producer shall mention 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,
41、will be subject to rejection. SAE INTERNATIONAL AMS6495B Page 7 of 7 8. NOTES 8.1 Revision Indicator A change bar (l) located in the 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 documen
42、t. 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 documents that contain editorial changes only. 8.2 Hardness conversion tables for metals are presented in
43、 ASTM E140. 8.3 Terms used in 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 of the primary units and are presented only for information. 8.5 Purchase documents should specify not less than the following: AMS6495B Product form and size or part number of product desired Quantity of product desired. If forging stock, any property data beyond that reported in 4.4.3. PREPARED BY AMS COMMITTEE “E”
