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/AMS6539AEROSPACEMATERIALSPECIFICATIONAMS6539Issued 2013-02Steel Bars, Forgings, and Tubing1.7Cr 3.8Ni 0.3
5、Mo (0.32 0.38 C)Aircraft-Quality(Composition similar to UNS K54532)RATIONALEAMS6539 is a new specification to cover aircraft-quality UNS K54532.1. SCOPE1.1 FormThis specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.1.2 Appli
6、cationThese 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 such applications.2. APPLICABLE DOCUMENTSThe issue of the following docum
7、ents 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 been cancelled and no superseding document
8、has been specified, the last published issue of that document shall apply.SAE AMS6539 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 (outside USA), www.sae.org.AMS2251 Toler
9、ances, 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 ProcedureAMS2370 Quality Assurance Sampling and Testing, Carbon and Low-All
10、oy 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-Resistant Steels and AlloysAMS2808 Identification, Fo
11、rgingsAS1182 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 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM A 255 Det
12、ermining Hardenability of SteelASTM A 370 Mechanical Testing of Steel ProductsASTM E 381 Macroetch Testing Steel Bars, Billets, Blooms and ForgingsASTM E 112 Determining Average Grain SizeASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel,Ingot Iron, and Wrought
13、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 with ASTM E 350, by spectrochemical methods, or by other analytical methods acceptable
14、 to purchaser.SAE AMS6539 Page 3 of 7TABLE 1 COMPOSITIONElement min maxCarbon 0.32 0.40Manganese 0.30 0.60Silicon 0.15 0.40Phosphorus - 0.025Sulfur - 0.015Chromium 1.60 2.00Nickel 3.60 4.10Molybdenum 0.25 0.60Copper - 0.203.1.1 Check AnalysisComposition variations shall meet the applicable requireme
15、nts 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 370:3.2.1 BarsBar shall not be cut from plate. (Also see 4.4.2).3.2.1.1 Bars 0.500 inch (12.70 mm) and Under in Nominal Diameter or Least
16、Distance Between Parallel Sides Cold finished having tensile strength not higher than 142 ksi (980 MPa) or hardness not higher than 295 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 Sides Hot finished and annealed, unless ot
17、herwise ordered, having hardness not higher than 295 HB or equivalent (See 8.2). Bars ordered cold finished may have hardness as high as 310 HB or equivalent (See 8.2).3.2.2 ForgingsAs ordered.3.2.3 Mechanical TubingCold finished, unless otherwise ordered, having hardness not higher than 295 HB, or
18、equivalent (See 8.2). Tubing ordered hot finished and annealed or tempered shall have hardness not higher than 295 HB or equivalent (See 8.2).3.2.4 Forging Stock As ordered by the forging manufacturer.3.3 PropertiesThe product shall conform to the following requirements; hardness, tensile, and impac
19、t testing shall be performed in accordance with ASTM A 370:SAE AMS6539 Page 4 of 73.3.1 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 E 381, shall show
20、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-Sectional AreaSquare InchesCross-Sectional Area Square Centimeters MacrographsUp to 36, incl Up to 232, incl S2 - R
21、1 - 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 tubes are produced directl
22、y 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 Size of Bars, Forgings, and TubingShall be ASTM No. 5 or finer determined in accordance with AST
23、M E 112.3.3.3 Response to Heat Treatment of Bars, Forgings, Tubing and Forging StockSpecimens extracted from the product shall have the properties shown in Table 3 for both tempering temperatures after being austenitized by heating to 1607 F 25 (875 C 14), holding at heat for a time commensurate wit
24、h section thickness, heating equipment, and procedure used. Specimens to be tempered at 392 F (210 C) shall be air quenched to below 90 F (32 C), cooled to -100 F (-73 C) or colder, holding at that temperature for not less than two hours andwarmed in air to room temperature. Specimens to be tempered
25、 at 1040 F (560 C) shall be air quenched to below 90 F (32 C). All specimens shall be tempered for 2 hours minimum.TABLE 3 MINIMUM LONGITUDINAL MECHANICAL PROPERTIESTempering temperature PROPERTY Value392 F 10(210 C 6)Tensile Strength 254 ksi (1750 MPa)Yield Strength 0.2% 203 ksi (1400 MPa)Elongatio
26、n in 4D 8%Charpy Vnotch 14 ft-lb (19 J)1040 F 10(560 C 6)Tensile Strength 178 ksi (1230 MPa)Yield Strength 0.2% 152 ksi (1050 MPa)Elongation in 4D 12%Charpy Vnotch 26 ft-lb (35 J)3.4 QualityThe product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign
27、 materials and from imperfections detrimental to usage of the product.3.4.1 Steel shall be aircraft-quality conforming to AMS2301.SAE AMS6539 Page 5 of 73.4.2 Bars and mechanical tubing ordered hot finished or cold finished or ground, turned, or polished shall, after removal of the standard stock re
28、moval allowance in accordance with AS1182, be free from seams, laps, tears, and cracks open to the machined, ground, turned, 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 o
29、f reentrant grain flow.3.5 Tolerances3.5.1 BarsIn accordance with AMS2251.3.5.2 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 performan
30、ce of allrequired 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 Tests4.2.1 Acceptance TestsComposition (3.1), condition (3.2), macrostructure (3.3.1), average
31、grain size (3.3.2), response to heat treatment for both tempering temperatures (3.3.3), frequency-severity cleanliness 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) is a period
32、ic test 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 Forging StockIn accordance with AMS2370.4.3.2 Forgings In accordance with AMS2372.4.4 Reports4.4.1 The vendor of the b
33、ars, forgings and tubing shall furnish with each shipment a report showing the results of tests for composition macrostructure, response to heat treatment and frequency-severity cleanliness rating of each heat, and for condition, average grain size of each lot, and stating that the product conforms
34、to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6539 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
35、.SAE AMS6539 Page 6 of 74.4.2 If the ship size/shape is cut from a larger cross section, report the nominal metallurgically worked size (See 3.2.1).4.4.3 The vendor of forging stock shall furnish with each shipment a report showing the results of tests for composition, macrostructure, response to he
36、at treatment and frequency-severity cleanliness rating of each heat. This report shall include the purchase order number, heat number, AMS6539, size and quantity.4.5 Resampling and Retesting4.5.1 Bars, Mechanical Tubing, and Forging StockIn accordance with AMS2370.4.5.2 Forgings In accordance with A
37、MS2372.5. 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 shall be supplied in lengths shorter than 10 feet (3 m).5.2
38、 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 tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be pro
39、tected 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, packaging, and transportation of the product to ensure carrier acceptance and saf
40、e delivery.6. ACKNOWLEDGMENTA vendor shall include this specification number letter in all quotations and when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection.SAE AMS6539 Page 7 of 78.
41、NOTES8.1 A change bar (|) 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 document title indicates a complete revision of the
42、 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 AMS are clarified in ARP1917.8.4 Dimensions and
43、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:AMS6539Product form and size (and/or part number, if applicable) of product desiredQuantity of product desiredPREPARED BY AMS COMMITTEE “E”
