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 2012 SAE InternationalAll rights reserved. No part of this publication may b
3、e 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 USA)Fax
4、: 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/AMS6549AEROSPACEMATERIALSPECIFICATIONAMS6549Issued 2013-01Steel Bars, Forgings, and Tubing1.0Cr 3.2Ni - 0
5、.2Mo (0.12 0.17C)Premium Aircraft-Quality Double Vacuum Melted(Composition similar to UNS K43214)RATIONALEAMS6549 is a new specification to cover double vacuum melted premium aircraft-quality UNS K43214.1. SCOPE1.1 FormThis specification covers a premium aircraft-quality, low-alloy steel in the form
6、 of bars, forgings, mechanical tubing, and forging stock.1.2 ApplicationThese products have been used typically for carburizing parts requiring high minimum core hardness within a narrow range, reduced distortion and subject to very rigid magnetic particle inspection standards, but usage is not limi
7、ted to such 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 specifi
8、ed. 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 PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada)
9、 or 724-776-4970 (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 SteelsAMS2300 Steel Cleanliness, Premium Aircraft-Quality, Magnetic Particle Inspection ProcedureA
10、MS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel, Wrought Products and Forging StockSAE AMS6549 Page 2 of 6AMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel, Forgings AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and A
11、lloy 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. Bo
12、x C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM E 45 Determining the Inclusion Content of SteelsASTM A 255 Determining Hardenability of SteelASTM A 370 Mechanical Testing of Steel ProductsASTM A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and Bill
13、etsASTM E 112 Determining Average Grain SizeASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel,Ingot Iron, and Wrought Iron3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the following percentages by weight shown in Table 1, determined by wet chemical me
14、thods in accordance with ASTM E 350, by spectrochemical methods, or by other analytical methods acceptable to purchaser.TABLE 1 - COMPOSITIONElement min maxCarbon 0.12 0.17Manganese 0.30 0.60Silicon 0.15 0.40Phosphorus - 0.015Sulfur - 0.005Chromium 0.80 1.10Nickel 3.00 3.50Molybdenum 0.22 0.32Copper
15、 - 0.353.1.1 Check AnalysisComposition variations shall meet the applicable requirements of AMS2259.3.2 Melting Practice Steel shall be double vacuum melted, using vacuum induction melting (VIM) followed by vacuum arc consumable electrode remelting (VAR).SAE AMS6549 Page 3 of 63.3 ConditionThe produ
16、ct shall be supplied in the following condition; hardness, tensile, and impact testing shall be performed in accordance with ASTM A 370:3.3.1 BarsBar 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 Side
17、s Cold 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 Hot finished and annealed, unless otherwise ordered, having hardne
18、ss not higher than 241 HB or equivalent (See 8.2). Bars ordered cold finished may have hardness as high as 285 HB or equivalent (See 8.2).3.3.2 ForgingsAs ordered.3.3.3 Mechanical TubingCold finished, unless otherwise ordered, having hardness not higher than 285 HB, or equivalent (See 8.2). Tubing o
19、rdered hot finished and annealed or tempered shall have hardness not higher than 285 HB or equivalent (See 8.2).3.3.4 Forging Stock As ordered by the forging manufacturer.3.4 PropertiesThe product shall conform to the following requirements; hardness shall be performed in accordance with ASTM A 370:
20、3.4.1 MacrostructureVisual examination of transverse full cross-sections from bars, billets tube rounds (solid, not hollow), 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 shal
21、l be no worse than the macrographs of ASTM A 604 shown in Table 2.TABLE 2 MACROSTRUCTURE LIMITSClass Condition Severity1FrecklsA2 White Spots A3 Radial Segregation B4 Ring Pattern B3.4.1.1 Macrostructure examination is not required for hollow tubes that are produced directly from ingots or blooms un
22、less specified by purchaser, in which case the purchaser shall specify standards to be used.3.4.2 Micro-Inclusion Rating of Each HeatNo specimen shall exceed the limits shown in Table 3, determined in accordance with ASTM E 45, Method D:SAE AMS6549 Page 4 of 6TABLE 3 MICRO-INCLUSIONS RATING LIMITSTy
23、pe AThinAHeavyBThinBHeavyCThinCHeavyDThinDHeavyWorst Field Severity 1.5 1.0 1.0 1.0 1.0 1.0 1.5 1.0Worst Field Frequency, maximum a 1a1a13Total Rateable Fields, Frequency, maximumb1b1b151a - Combined A+B+C, not more than 3 fieldsb - Combined A+B+C, not more than 8 fields3.4.2.1 A rateable field is d
24、efined as one that has type A, B, C or D inclusion rating of at least No. 1.0 thin or heavy in accordance with Jernkontoret chart, Plate g44r, ASTM E 45.3.4.3 Average Grain Size of Bars, Forgings and TubingShall be ASTM No. 6 or finer determined in accordance with ASTM E 112.3.4.4 Hardenability of E
25、ach HeatShall be J 1/16 inch (1.6 mm) = 48 HRC maximum and J 23/64 inch (9.1 mm) = 33 HRC minimum, determined on the standard end-quench test specimen in accordance with ASTM A 255 except that the steel shall be normalized at 1562 F 10 (850 C 6) and the test specimen austenitized at 1517 F 10 (825 C
26、 6).3.5 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.3.5.1 Steel shall be premium aircraft-quality conforming to AMS2300.3.5.2 Product ordered hot finished or
27、 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, turned, or polished surface.3.5.3 Grain flow of die forgings, except in areas that contain f
28、lash-line end grain, shall follow the general contour of the forgings showing no evidence of reentrant grain flow.3.6 Tolerances3.6.1 Bars In accordance with AMS2251.3.6.2 Mechanical Tubing In accordance with AMS2253,4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for inspectionThe vendor of the p
29、roduct 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 specified requirements.SAE AMS6549 Page 5 of 64
30、.2 Classification of Tests4.2.1 Acceptance TestsComposition (3.1), condition (3.3), macrostructure (3.4.1), micro-inclusion rating (3.4.2), average grain size (3.4.3), hardenability of each heat (3.4.4), and tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicab
31、le.4.2.2 Periodic TestsFrequency-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 of testing is specified by purchaser.4.3 Sampling and Testing4.3.1 Bars, Mechanical Tubing, and
32、 Forging Stock In accordance with AMS2370.4.3.2 Forgings In accordance with AMS2372.4.4 Reports4.4.1 The vendor of bars, forgings, and tubing shall furnish with each shipment a report showing the results of tests for composition, macrostructure, micro-inclusion rating and hardenability of each heat,
33、 and for condition 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, AMS6549, melt route, product form and size (and/or part number, if applicable) 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 If the ship size/shape is cut from a larger cross section, report the nominal metallurgically worked size (See 3.3.1).4.4.3 The vendor of forging stock shall furnish with each shipment a
35、report showing the results of tests for composition, macrostructure, micro-inclusion rating and hardenability of each heat. This report shall include the purchase order number, heat number, AMS6549, size and quantity.4.5 Resampling and Retesting4.5.1 Bars, Mechanical Tubing, and Forging StockIn acco
36、rdance 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 acceptable in mill lengths of 6 to 20 feet (1.8 to 6.1 m) but not more than 10% of any shipment shal
37、l be supplied in lengths shorter than 10 feet (3 m).SAE AMS6549 Page 6 of 65.2 Identification5.2.1 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 TreatmentBars and mechanical tu
38、bing 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 commercial practice and in compliance with applicable rules and regulations pertaining to the handling, pac
39、kaging, and transportation of the product to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENTA vendor shall include this specification number in all quotations and when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specification, or to modifications authorize
40、d by purchaser, will be subject to rejection.8. NOTES8.1 A change bar (I) 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 specification. An (R) symbol to the left of the doc
41、ument title indicates a complete revision of the specification, including technical revisions. 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
42、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:AMS6549Product form and size (and/or part number, if applicable) of product Quantity of productPREPARED BY AMS COMMITTEE “E”
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