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/AMS6346BAEROSPACE MATERIAL SPECIFICATIONAMS6346 REV. BIssued 1998-10Revised 2013-10Supersedin
5、g AMS6346ASteel Bars0.95Cr - 0.20Mo (0.28 to 0.33C) (SAE 4130)Hardened and Tempered, 125 Ksi (862 MPa) Tensile Strength(Composition similar to UNS G41300)RATIONALEAMS6346B results from a Five Year Review and update of this specification.1. SCOPE1.1 FormThis specification covers an aircraft-quality,
6、low-alloy steel in the form of heat treated bars 1.50 inches (38.1 mm) and less in diameter or least distance between parallel sides.1.2 ApplicationThese bars have been used typically for parts with sections 1.50 inch (38.1 mm) and under in nominal thickness requiring a minimum tensile strength of 1
7、25 ksi (862 MPa), but usage is not limited to such application.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 unles
8、s a specific document issue is specified. 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
9、: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.AMS2251 Tolerances, Low-Alloy Steel BarsAMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon SteelsAMS2301 Steel Cleanliness, Aircraft Quality, Magnetic Particle Inspection ProcedureAMS2370 Quality Assu
10、rance Sampling and Testing, Carbon and Low-Alloy Steel, Wrought Products and Forging StockSAE INTERNATIONAL AMS6346B Page 2 of 6AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and AlloysAS1182 Standard Stock Remov
11、al 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 E 8 / E 8M Tension Testing of Metallic Mate
12、rialsASTM E 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 Macrotech Testing, Steel Bars, Billets, Blooms, and ForgingsASTM E 384 Knoop and Vickers Hardness of Materials3. TECHNICAL REQ
13、UIREMENTS3.1 CompositionShall conform to the 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 to purchaser.TABLE 1 - COMPOSITIONElement min maxCarbon 0.28 0.33Manganese 0.40
14、 0.60Silicon 0.15 0.35Phosphorus - 0.025Sulfur - 0.025Chromium 0.80 1.10Molybdenum 0.15 0.25Nickel - 0.25Copper - 0.353.1.1 Check AnalysisComposition variations shall meet the applicable requirements of AMS2259.3.2 ConditionsBars shall be supplied in the following conditions:3.2.1 Bars 0.500 Inch (1
15、2.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel SidesHardened and tempered and cold finished.3.2.2 Bars Over 0.500 Inch (12.70 mm) in Nominal Diameter or Least Distance Between Parallel SidesHot finished and hardened and tempered, or if specified, hardened and tempered and
16、cold finished.SAE INTERNATIONAL AMS6346B Page 3 of 63.2.3 Bars shall not be cut from plate (Also see 4.4.2).3.3 PropertiesBars shall conform to the following requirements:3.3.1 MacrostructureVisual examination of transverse full cross-sections from bars, and billets, etched in hot hydrochloric acid
17、in accordance 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-Sectional AreaSquare InchesCross-Sectional AreaSquare Centimeters Macrogr
18、aphsUp to 36, incl 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 organizatio
19、n.3.3.2 Average Grain SizeShall be ASTM No. 5 or finer, determined in accordance with ASTM E 112.3.3.3 Longitudinal Tensile PropertiesShall be as shown in Table 3 for product 1.50 inches (38.1 mm) and less in diameter or least distance between parallel sides (See 8.2), determined in accordance with
20、ASTM E 8 / E 8M.TABLE 3 - LONGITUDINAL TENSILE PROPERTIES, MINIMUMProperty ValueTensile strength 125 ksi (862 MPa)Yield strength at 0.2% Offset 100 ksi (689 MPa)Elongation in 4D 17%Reduction of Area 55%3.3.3.1 Mechanical property requirements for product outside the size range covered by 3.3.3 shall
21、 be agreed upon between purchaser and producer.3.3.4 Decarburization3.3.4.1 Bars ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces.3.3.4.2 Allowable decarburization of bars ordered to specified microstructural requirements shall be agr
22、eed upon by purchaser and vendor.3.3.4.3 Decarburization of bars to which 3.3.4.1 or 3.3.4.2 is not applicable shall be not greater than shown in Table 4.SAE INTERNATIONAL AMS6346B Page 4 of 6TABLE 4A - MAXIMUM DEPTH OF DECARBURIZATION, INCH/POUND UNITSNominal Diameter or DistanceBetween Parallel Si
23、desInchesTotal Depth of DecarburizationInchesUp to 0.375, incl 0.010Over 0.375 to 0.500, incl 0.012Over 0.500 to 0.625, incl 0.014Over 0.625 to 1.000, incl 0.017Over 1.000 to 1.500, incl 0.020Over 1.500 to 2.000, incl 0.025Over 2.000 to 2.500, incl 0.030Over 2.500 to 3.000, incl 0.035Over 3.000 to 4
24、.000, incl 0.045TABLE 4B - MAXIMUM DEPTH OF DECARBURIZATION, SI UNITSNominal Diameter or DistanceBetween Parallel SidesMillimetersTotal Depth of DecarburizationMillimetersUp to 9.52, incl 0.25Over 9.52 to 12.70, incl 0.30Over 12.70 to 15.88, incl 0.36Over 15.88 to 25.40, incl 0.43Over 25.40 to 38.10
25、, incl 0.51Over 38.10 to 50.80, incl 0.64Over 50.80 to 63.50, incl 0.76Over 63.50 to 76.20, incl 0.89Over 76.20 to 101.60, incl 1.143.3.4.4 Decarburization shall be measured by the metallographic method, or by a traverse method using microhardness testing in accordance with ASTM E 384. The microhard
26、ness method shall be conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization, when measured by the microhardness method, is defined as the perpendicular distance from the surface to the depth under that su
27、rface where there is no further increase in hardness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by any decarburization on the adjacent surface. In case of dispute, the depth of decarburization determined using the microhardness traverse method shall gove
28、rn.3.3.4.4.1 When determining the depth of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the above limits by more than 0.005 inches (0.13 mm) and the width is 0.065 inch (1.65 mm) or less.3.4 QualityBars, as received by purchas
29、er, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the bars.3.4.1 Steel shall be aircraft quality conforming to AMS2301.3.4.2 Bars ordered hot rolled or cold drawn or ground, turned, or polished shall, after removal of
30、 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 TolerancesShall conform to all applicable requirements of AMS2251.SAE INTERNATIONAL AMS6346B Page 5 of 64. QUALITY ASSURANCE PROV
31、ISIONS4.1 Responsibility for InspectionThe vendor of bars shall supply all samples of vendors tests and shall be responsible for the performance of all required tests. Purchaser reserves the right to sample and perform any confirmatory testing deemed necessary to ensure that the bars conform to spec
32、ified requirements.4.2 Classification of TestsAll technical requirements are acceptance tests and shall be performed on each heat or lot as applicable.4.3 Sampling and TestingIn accordance with AMS2370.4.4 Reports4.4.1 The producer of bars shall furnish with each shipment a report showing the produc
33、er identity and country where the metal was melted (e. g., final melt in the case of metal processed by multiple melting operations) and results of tests for composition, macrostructure and frequency-severity cleanliness rating of each heat and for tensile properties and average grain size of each l
34、ot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6346B, size and quantity.4.4.2 Report the nominal metallurgically worked cross sectional size and the cut size, if different (Also see 3.2.3).4
35、.5 Resampling and RetestingIn accordance with AMS2370.5. PREPARATION FOR DELIVERY5.1 SizesExcept when exact lengths or multiples of exact lengths are ordered, straight bars 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 le
36、ngths shorter than 10 feet (3 m).5.2 IdentificationIn accordance with AMS2806.5.3 Protective TreatmentBars ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipment.5.4 PackagingBars shall be prepared for shipment in accordance with commercial p
37、ractice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the bars to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENTA vendor shall include this specification number and its revision letter in all quotations and when ac
38、knowledging purchase orders.7. REJECTIONProduct not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection.SAE INTERNATIONAL AMS6346B Page 6 of 68. NOTES8.1 A change bar (|) located in the left margin is for the convenience of the user in locating
39、 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) are not used in original publications, nor
40、 in documents that contain editorial revisions only.8.2 The values shown in 3.3.3 are those of AMS-S-6758, Condition F, and have not been substantiated in accordance with AMS statistical analysis procedure.8.3 Terms used in AMS are clarified in ARP1917.8.4 Dimensions and properties in inch/pound uni
41、ts and Fahrenheit temperatures are primary; dimensions and properties in SI units and Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information.8.5 Purchase documents should specify not less than the following:AMS6346BProduct form and s
42、ize of product desiredWhether hot or cold finish is required for bars over 0.500 inch (12.7 mm) (See 3.2.2)Quantity of product desiredProperty and acceptance requirements from the cognizant engineering organization applicable to sizes outside the size range listed in 1.1.8.6 Similar SpecificationsAMS-S-6758 and MIL-S-6758 are listed for information only and shall not be construed as an acceptance alternate unless all requirements of this AMS are met.PREPARED BY AMS COMMITTEE “E”
