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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2013 SAE InternationalAll rights reserved. No part of this publi
3、cation 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: +1 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS6492AAEROSPACE MATERIAL SPECIFICATIONAMS6492 REV. AIssued 2009-09Revised 2013-11Supersedin
5、g AMS6492Steel Bars, Forgings, and Tubing1.0Cr - 3.25Ni - 0.40Mo (0.17 - 0.22C)Aircraft Quality(Composition similar to UNS K41910)RATIONALEAMS6492A results from a Five Year Review and update of this specification .1. SCOPE1.1 FormThis specification covers an aircraft-quality, low-alloy steel in the
6、form of bars, forgings, mechanical tubing, and forging stock.1.2 ApplicationThese 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 standards, but usage is not limited to suc
7、h applications.2. APPLICABLE DOCUMENTSThe 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 specific document issue is specified. When t
8、he referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply.2.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-77
9、6-4970 (outside USA), www.sae.org.AMS2251 Tolerances, Low-Alloy Steel BarsAMS2253 Tolerances, Carbon and Alloy Steel TubingAMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon SteelsAMS2301 Steel Cleanliness, Aircraft Quality, Magnetic Particle Inspection ProcedureSAE INTERNATIONAL A
10、MS6492A Page 2 of 6AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging StockAMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Forgings AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy
11、Steels and Corrosion and Heat-Resistant Steels and AlloysAMS2808 Identification, ForgingsAS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel, Bars and Mechanical Tubing2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P. O. Box C7
12、00, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM A 255 Determining Hardenability of SteelASTM A 370 Mechanical Testing of Steel ProductsASTM E 381 Macroetch Testing Steel Bars, Billets, Blooms and Forgings.ASTM E 112 Determining Average Grain SizeASTM E 350 Chemical Analysi
13、s of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel,Ingot Iron, and Wrought IronASTM E 384 Knoop and Vickers Hardness of Materials3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the following percentages by weight shown in Table 1, determined by wet chemical methods in accordance w
14、ith ASTM E 350, by spectrochemical methods, or by other analytical methods acceptable to purchaser.TABLE 1 COMPOSITIONElement min maxCarbon 0.17 0.22Manganese 0.30 0.60Silicon - 0.40Phosphorus - 0.020Sulfur - 0.015Chromium 0.80 1.20Nickel 3.00 3.50Molybdenum 0.30 0.603.1.1 Check AnalysisComposition
15、variations shall meet the applicable requirements of AMS2259.3.2 ConditionThe product shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A 370:SAE INTERNATIONAL AMS6492A Page 3 of 63.2.1 Bars3.2.1.1 Bars 0.500 inch (12.70 mm) and U
16、nder 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 Nominal Diameter or Least Distance Between Parallel SidesHot
17、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).3.2.1.3 Bars shall not be cut from plate.3.2.2 ForgingsAs ordered.3.2.3 Mechanical TubingCold finish
18、ed, 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 StockAs ordered by the forging manufacturer.3.3 PropertiesThe product s
19、hall conform to the following requirements; hardness, tensile, and impact testing shall be performed in accordance with ASTM A 370:3.3.1 MacrostructureVisual examination of transverse full cross-sections from bars, billets, tube rounds, and forging stock, etched in hot hydrochloric acid in accordanc
20、e 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 LIMITSCross-Section AreaSquare InchesCross-Section AreaSquare Centimeters MacrographsUp to 36, in
21、cl Up to 232, incl S2 -R1 -C2Over 36 to 133, incl Over 232 to 858, incl S2 -R2 -C3Over 133 Over 858 Note 1Note 1 Limits for larger sizes shall be agreed upon by purchaser and vendor. The purchaser shall have written approval of the agreement from the cognizant engineering organization.3.3.1.1 If tub
22、es are produced directly from ingots or large blooms, transverse sections may be taken from the tubes rather than tube rounds. Macroetch standards for such tubes shall be agreed upon by purchaser and vendor.3.3.2 Average Grain SizeShall be ASTM No. 5 or finer determined in accordance with ASTM E 112
23、.SAE INTERNATIONAL AMS6492A Page 4 of 63.3.3 Response to Heat Treatment3.3.3.1 Bars, Forgings and Mechanical TubingSpecimens from the product shall have the properties shown in Table 3 after being austenitized by heating to 1515 F 25(824 C 14), holding at heat for a time commensurate with section th
24、ickness, heating equipment, and procedure used, oil quenched to below 90 F (32 C) followed by tempering for 2 hours minimum at 285 F 10 (141 C 6).TABLE 3 MINIMUM LONGITUDINAL MECHANICAL PROPERTIESPROPERTY VALUETensile Strength 196 ksi (1350 MPa)Yield Strength 0.2% 145 ksi (1000 MPa)Elongation in 4D
25、10%Charpy Vnotch 37 ft-lb (50 J)3.3.3.2 Forging StockWhen a sample of stock is forged to a test coupon and heat treated as in 3.3.3.1, specimens taken from the heat treated coupon shall conform to the requirements of 3.3.3.1. If specimens taken from the stock after heat treatment as in 3.3.3.1 confo
26、rm to the requirements of 3.3.3.1, tests shall be accepted as equivalent to tests of a forged coupon.3.4 QualityThe 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 St
27、eel shall be aircraft-quality conforming to AMS2301.3.4.2 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 machined, ground, tur
28、ned, or polished surface.3.4.3 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.3.5 Tolerances3.5.1 BarsIn accordance with AMS2251.3.5.2 Mechanical TubingIn accordance with AMS2
29、253.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for inspectionThe 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
30、 to ensure that the product conforms to specified requirements.SAE INTERNATIONAL AMS6492A Page 5 of 64.2 Classification of Tests4.2.1 Acceptance TestsComposition (3.1), condition (3.2), macrostructure (3.3.1), average grain size (3.3.2), response to heat treatment (3.3.3.1),frequency-severity cleanl
31、iness rating (3.4.1), and tolerances (3.5) are acceptance tests and shall be performed on each heat or lot as applicable.4.2.2 Periodic TestsGrain flow of die forgings (3.4.3) and response to heat treatment of forging stock (3.3.3.2) are periodic tests and shall be performed at a frequency selected
32、by the vendor unless frequency of testing is specified by purchaser.4.3 Sampling and Testing4.3.1 Bars, Mechanical Tubing, and Forging Stock In accordance with AMS2370.4.3.2 ForgingsIn accordance with AMS2372.4.4 Reports4.4.1 The producer of the bars, forgings, and tubing shall furnish with each shi
33、pment a report showing the producer identity and country where the metal was melted (i.e., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition, macrostructure, and frequency-severity cleanliness rating of each heat, and for condition, av
34、erage 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, AMS6492A, product form and size or part number, and quantity. If forgings are supplied,
35、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 (See 3.2.1.3).4.4.3 The producer of forging stock shall furnish with each shipment a report showing the producer iden
36、tity and country where the metal was melted (e. g., final melt in the case of metal processed by multiple melting operations) and the composition, macrostructure and frequency-severity cleanliness rating of each heat. This report shall include the purchase order number, heat number, AMS6492A, size a
37、nd quantity.4.5 Resampling and Retesting4.5.1 Bars, Mechanical Tubing, and Forging StockIn accordance with AMS2370.4.5.2 Forgings In accordance with AMS2372.5. PREPARATION FOR DELIVERY5.1 SizesExcept when exact lengths or multiples of exact lengths are ordered, straight bars and tubing will be accep
38、table 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).SAE INTERNATIONAL AMS6492A Page 6 of 65.2 Identification5.2.1 Bars and Mechanical Tubing In accordance with AMS2806.5.2.2 ForgingsIn accordance with AMS2
39、808.5.2.3 Forging StockAs agreed upon by purchaser and vendor.5.3 Protective TreatmentBars and mechanical tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipment.5.4 PackagingThe product shall be prepared for shipment in accordance with
40、 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. ACKNOWLEDGMENTA vendor shall include this specification number and its revision letter in all quotat
41、ions and when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection.8. NOTES8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas where technica
42、l 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 documents that co
43、ntain 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 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 Purchase documents should specify not less than the following:AMS6492AProduct form and size or part number of product desiredQuantity of product desired.PREPARED BY AMS COMMITTEE “E”
