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 isentirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, 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 be
3、 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/AMS6548AEROSPACEMATERIALSPECIFICATIONAMS6548Issued 2013-01Steel Bars, Forgings, and Tubing1.0Cr 3.2Ni 0.2M
5、o (0.12 0.17C)Premium Aircraft-QualityElectroslag Remelted or Consumable Electrode Vacuum Remelted(Composition similar to UNS K43214)RATIONALEAMS6548 is a new specification to cover premium aircraft-quality UNS K43214.1. SCOPE1.1 FormThis specification covers a premium aircraft-quality, low-alloy st
6、eel in the 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 stringent magnetic particle inspection standards, but usage
7、is not limited to such applications.1.3 ClassificationSteel covered by this specification is classified by melting practice as follows:Type 1 Electroslag remelted (ESR)Type 2 Consumable electrode vacuum remelted (VAR)1.3.1 Unless a specific type is ordered, either type may be supplied.2. APPLICABLE
8、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 the referenced document has be
9、en cancelled and no superseding document has been specified, the last published issue of that document shall apply.SAE AMS6548 Page 2 of 72.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970
10、 (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 ProcedureAMS2370 Quality A
11、ssurance 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 Steels and Corrosion and Heat-Resi
12、stant 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 C700, West Conshohocken, PA 19428-295
13、9, Tel: 610-832-9585, www.astm.org.ASTM E 45 Determining the Inclusion Content of Steel ASTM A 255 Determining Hardenability of SteelASTM A 370 Mechanical Testing of Steel ProductsASTM A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and BilletsASTM E 112 Determining Average Grain
14、 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 methods in accordance with ASTM E 350, by
15、 spectrochemical methods, or by other analytical methods acceptable to purchaser.SAE AMS6548 Page 3 of 7TABLE 1 - COMPOSITIONElement min maxCarbon 0.12 0.17Manganese 0.30 0.60Silicon 0.15 0.40Phosphorus - 0.020Sulfur - 0.010Chromium 0.80 1.10Nickel 3.00 3.50Molybdenum 0.22 0.32Copper - 0.353.1.1 Che
16、ck AnalysisComposition variations shall meet the 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 ConditionThe product shall be sup
17、plied in the following condition; hardness and tensile strength shall be determined 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 Sides Cold finished having
18、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 hardness not higher than 241
19、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 ordered hot finished and
20、 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.SAE AMS6548 Page 4 of 73.4 PropertiesThe product shall conform to the following requirements; hardness shall be performed in accordance with ASTM A 370:
21、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 for
22、product shall 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
23、or blooms unless specified by purchaser, in which case the purchaser shall specify standards to be used. 3.4.2 Micro-Inclusion Rating of Each Heat No specimen shall exceed the limits shown in Table 3, determined in accordance with ASTM E 45, Method D:TABLE 3 MICRO-INCLUSIONS RATING LIMITSType AThinA
24、HeavyBThinBHeavyCThinCHeavyDThinDHeavyWorst Field Severity 1.5 1.0 1.5 1.0 1.5 1.0 1.5 1.0Worst Field Frequency, maximuma1a1a13Total Rateable Fields, Frequency, maximumb1b1b181a - Combined A+B+C, not more than 3 fieldsb - Combined A+B+C, not more than 8 fields3.4.3 Average Grain Size of Bars, Forgin
25、gs, and TubingShall be ASTM No. 5 or finer determined in accordance with ASTM E 112.3.4.4 Hardenability of Each 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
26、 the steel shall be normalized at 1562 F 10 (850 C 6) and the test specimen austenitized at 1517 F 10 (825 C 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 produ
27、ct.3.5.1 Steel shall be premium aircraft-quality conforming to AMS2300.SAE AMS6548 Page 5 of 73.5.2 Bars, forging or tubing 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,
28、 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 the general contour of the forgings showing no evidence of reentrant grain flow.3.6 Tolerances3.6.1 Bars In accordance with AMS22
29、51.3.6.2 Mechanical Tubing In accordance with AMS2253,4. 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
30、 perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements.4.2 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 ea
31、ch heat (3.4.4), and tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicable.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
32、 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 Forgings In accordance with AMS2372.4.4 Reports4.4.1 The vendor of the bars, forgings, and tubing shall furnish with each shipment a report
33、 showing the results of tests for composition, macrostructure, micro-inclusion rating and hardenability of each heat, and for condition, 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, hea
34、t and lot numbers, AMS6548, melt type, product form and size (and/or part number, if applicable) and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings shall also be included.SAE AMS6548 Page 6 of 74.4.2 If the ship size/shape is cut from a larger cross s
35、ection, report the nominal metallurgically worked size (See 3.3.1).4.4.3 The vendor of forging stock shall furnish with each shipment a report showing the results of tests for composition, macrostructure, micro-inclusion rating and hardenability of each heat. This report shall include the purchase o
36、rder number, heat number, AMS6548, melt type, size and quantity.4.5 Resampling and Retesting4.5.1 Bars, Mechanical Tubing, and Forging StockIn accordance with AMS2370.4.5.2 ForgingsIn accordance with AMS2372.5. PREPARATION FOR DELIVERY5.1 SizesExcept when exact lengths or multiples of exact lengths
37、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 than 10 feet (3 m).5.2 Identification5.2.1 Bars and Mechanical Tubing In accordance with AMS2806.5.2.2 Forgings In accord
38、ance with AMS2808.5.2.3 Forging Stock As 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
39、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. ACKNOWLEDGMENTA vendor shall include this specification number in all quotations and
40、when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection.SAE AMS6548 Page 7 of 78. NOTES8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas
41、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. Change bars and (R) are not used in original publications, nor in doc
42、uments specifications 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 temperatures are primary; dimensions and properties in S
43、I 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:AMS6548Melt TypeProduct form and size (and/or part number, if applicable) of product desiredQuantity of product desired.PREPARED BY AMS COMMITTEE “E”
