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/AMS6303HAEROSPACEMATERIALSPECIFICATIONAMS6303 REV. HIssued 1955-03Revised 2012-08Superseding AMS6303GStee
5、l Bars and Forgings, Low Alloy, Heat-Resistant0.65Si - 1.25Cr - 0.50Mo - 0.85V (0.25 - 0.30C)(Composition similar to UNS K22770)RATIONALEAMS6303H results from a Five Year Review and update of this specification.1. SCOPE1.1 FormThis specification covers an aircraft-quality, low-alloy, heat-resistant
6、steel in the form of bars, forgings, and forging stock.1.2 ApplicationThese products have been used typically for parts such as turbine discs, compressor discs, and fasteners, for service up to 1050 F (566 C), but usage is not limited to such applications.2. APPLICABLE DOCUMENTSThe issue of the foll
7、owing 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 been cancelled and no supersedin
8、g 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 724-776-4970 (outside USA), www.sae.org.AMS2251 Tolerances, Low-A
9、lloy Steel BarsAMS2259 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-Alloy Steel Wrought Products and Forging StockAMS2372 Quality As
10、surance Sampling and Testing, Carbon and Low-Alloy Steel, ForgingsAMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and AlloysSAE AMS6303H Page 2 of 7AMS2808 Identification, ForgingsAS1182 Standard Stock Removal All
11、owance, 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 370 Mechanical Testing of Steel ProductsASTM E
12、112 Determining Average Grain SizeASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought IronASTM E 381 Macroetch Testing, Inspection, and Rating Steel Products Comprising Bars, Billets, Blooms, and ForgingsASTM E 384 Knoop and Vickers Hardne
13、ss of Materials3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1, determined wet chemical methods in accordance with ASTM E 350, by spectrochemical methods, or by other analytical methods acceptable to purchaser.TABLE 1 - COMPOSITIONElement min maxCa
14、rbon 0.25 0.30Manganese 0.60 0.90Silicon 0.55 0.75Phosphorus - 0.025Sulfur - 0.025Chromium 1.00 1.5Molybdenum 0.40 0.60Vanadium 0.75 0.95Nickel - 0.50Copper - 0.503.1.1 Check AnalysisComposition variations shall meet the applicable requirements of AMS2259.3.2 ConditionThe product shall be supplied i
15、n the following condition; hardness and tensile strength shall be determined in accordance with ASTM A 370:SAE AMS6303H Page 3 of 73.2.1 BarsBar shall not be cut from plate. (Also see 4.4.2.)3.2.1.1 Bars 0.500 Inch (12.50 mm) and Under in Nominal Diameter or Least Distance Between Parallel SidesCold
16、 finished having tensile strength not higher than 125 ksi (862 MPa) or equivalent hardness (See 8.2).3.2.1.2 Bars Over 0.500 Inch (12.50 mm) in Nominal Diameter or Least Distance Between Parallel SidesHot finished and annealed unless otherwise ordered, having hardness not higher than 241 HB, or equi
17、valent (See 8.3). Bars ordered cold finished may have hardness as high as 248 HB, or equivalent (See 8.3).3.2.2 ForgingsAnnealed having hardness not higher than 241 HB, or equivalent (See 8.3).3.2.3 Forging StockAs ordered by the forging manufacturer.3.3 PropertiesThe product shall conform to the fo
18、llowing requirements; hardness testing shall be performed in accordance with ASTM A 370:3.3.1 MacrostructureVisual examination of transverse full cross sections from bars, billets, and forging stock, etched in hot hydrochloric acid, in accordance with ASTM E 381, shall show no pipe or cracks. Porosi
19、ty, 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 - R1 - C2Over 36 to 100, inc
20、l Over 232 to 645. incl S2 - R2 C2Over 100 to 133. incl Over 645 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 organization3.3.2 A
21、verage Grain Size of Bars, Forgings and TubingShall be ASTM No. 5 or finer, determined in accordance with ASTM E 112.3.3.3 Decarburization3.3.3.1 Bars ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces. 3.3.3.2 Allowable decarburization
22、 of bars and billets ordered for redrawing or forging or to specified microstructural requirements shall be as agreed upon by purchaser and vendor.3.3.3.3 Decarburization of bars to which 3.3.3.1 or 3.3.3.2 is not applicable shall be not greater than shown in Table 3.SAE AMS6303H Page 4 of 7TABLE 3A
23、 - MAXIMUM DEPTH OF DECARBURIZATION LIMITS, INCH/POUND UNITSNominal Diameter or DistanceBetween Parallel SidesInchesTotal Depth ofDecarburizationInchUp to 0.375, incl 0.015Over 0.375 to 0.500, incl 0.017Over 0.500 to 0.625, incl 0.019Over 0.625 to 1.000, incl 0.022Over 1.000 to 1.500, incl 0.025Over
24、 1.500 to 2.000, incl 0.030Over 2.000 to 2.500, incl 0.035Over 2.500 to 3.000, incl 0.040Over 3.000 to 4.000, incl 0.045TABLE 3B - MAXIMUM DEPTH OF DECARBURIZATION LIMITS, SI UNITSNominal Diameter or DistanceBetween Parallel SidesMillimetersTotal Depth ofDecarburizationMillimetersUp to 9.52, incl 0.
25、38Over 9.52 to 12.70, incl 0.43Over 12.70 to 15.88, incl 0.48Over 15.88 to 25.40, incl 0.56Over 25.40 to 38.10, incl 0.64Over 38.10 to 50.80, incl 0.76Over 50.80 to 63.50, incl 0.89Over 63.50 to 76.20, incl 1.02Over 76.20 to 101.60, incl 1.143.3.3.4 Decarburization shall be measured by the metallogr
26、aphic method, by the HR30N scale hardness testing method, or by a traverse method using microhardness testing in accordance with ASTM E 384. The hardness method(s) shall be conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. D
27、epth of decarburization, when measured by a hardness method, is defined as the perpendicular distance from the surface to the depth under that surface below that there is no further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by any d
28、ecarburization on the adjacent surface. In case of dispute, the depth of decarburization using the microhardness traverse shall govern.3.3.3.4.1 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the ab
29、ove limits by more than 0.005 inch (0.13 mm) and the width is 0.065 inch (1.65 mm) or less.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 Steel shall
30、be aircraft-quality conforming to AMS2301.SAE AMS6303H Page 5 of 73.4.2 Bars ordered hot rolled or cold drawn 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 ground, turned,
31、 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 TolerancesBars shall conform to all applicable requirements of AMS2251.4. QUALITY ASSURANCE PROVI
32、SIONS4.1 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 to ensure that the product co
33、nforms to specified requirements.4.2 Classification of Tests4.2.1 Acceptance TestsComposition (3.1), condition (3.2), macrostructure (3.3.1), average grain size (3.3.2), decarburization (3.3.3), frequency-severity cleanliness (3.4.1), and tolerances (3.5) are acceptance tests and shall be performed
34、on each heat or lot as applicable.4.2.2 Periodic TestsGrain flow of die forgings (3.4.1) is a periodic 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 and Forging StockIn accordance with AMS237
35、0.4.3.2 ForgingsIn accordance with AMS2372.SAE AMS6303H Page 6 of 74.4 Reports4.4.1 The vendor of bars and forgings shall furnish with each shipment a report showing the results of composition, macrostructure, and frequency-severity cleanliness rating for each heat and for hardness and average grain
36、 size of each lot, and stating that the product conforms to other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6303H, product form, size (and/or part number, if applicable), and quantity. If forgings are supplied, the size and melt source of s
37、tock 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 3.2.1).4.4.3 The vendor of forging stock shall furnish with each shipment a report showing the results of tests for composition,
38、macrostructure and the frequency-severity cleanliness rating of each heat. This report shall include the purchase order number, heat number, AMS6303H, size and quantity4.5 Resampling and Retesting4.5.1 Bars and Forging StockIn accordance with AMS2370.4.5.2 ForgingsIn accordance with AMS2372.5. PREPA
39、RATION FOR DELIVERY5.1 SizesExcept when exact lengths or multiples of exact lengths are ordered, straight bars will be acceptable in mill lengths of 6 to20 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 BarsIn
40、 accordance with AMS2806.5.2.2 ForgingsIn accordance with AMS2808.5.2.3 Forging StockAs agreed upon by purchaser and vendor.5.3 Protective TreatmentBars ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipment.5.4 PackagingThe product shall be
41、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 safe delivery.SAE AMS6303H Page 7 of 76. ACKNOWLEDGMENTA vendor shall include
42、 this specification number and its revision 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.8. NOTES8.1 A change bar (l) located in the left margin is
43、for the convenience of the user in locating areas 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)
44、 are not used in original publications, nor in documents that contain editorial changes only.8.2 Tensile strength to hardness conversions are presented in ASTM A 370.8.3 Hardness conversion tables for metals are presented in ASTM E 140.8.4 Terms used in AMS are clarified in ARP1917.8.5 Dimensions an
45、d 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.8.6 Purchase documents should specify not less than the following:AMS6303HProduct form and size (and/or part number, if applicable) of product desiredQuantity of product desiredPREPARED BY AMS COMMITTEE “E”
