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 2014 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/AMS6340BAEROSPACE MATERIAL SPECIFICATIONAMS6340 REV. BIssued 2006-03Revised 2014-07Supersedin
5、g AMS6340ASteel Bars, Forgings, and Tubing0.88Cr - 1.8Ni - 0.42Mo - 0.08V (0.28 - 0.33C) (4330 Mod)Consumable Electrode Vacuum Remelted(Composition similar to UNS K23080)RATIONALEAMS6340B results from a Five Year Review and update of this specification that revises macrostructure, steel cleaniness,
6、decarburization, and reporting requirements.1. SCOPE1.1 FormThis specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.1.2 ApplicationThese products have been used typically for parts requiring high tensile strength and g
7、ood ductility with relatively high impact strength, superior transverse properties, and hardness, but usage is not limited to these applications. Certain design and processing procedures may cause these products to become susceptible to stress-corrosion cracking after heat treatment; ARP1110 recomme
8、nds practices to minimize such conditions.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
9、 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: 877-606-7323 (insid
10、e USA and Canada) 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 SteelsSAE INTERNATIONAL AMS6340B Page 2 of 9AMS2300 Steel Cleanliness, Premium Ai
11、rcraft-Quality, Magnetic Particle Inspection ProcedureAMS2310 Qualification Sampling and Testing of Steelsfor Transverse Tensile PropertiesAMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging StockAMS2372 Quality Assurance Sampling and Testing, Carb
12、on and Low-Alloy Steel ForgingsAMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat -Resistant Steels and AlloysAMS2808 Identification, ForgingsAS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Stee
13、l Bars and Mechanical TubingARP1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corrosion Resistant Steels and Alloys2.2 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.
14、ASTM A 255 End-Quench Test for Hardenability of SteelASTM A 370 Mechanical Testing of Steel ProductsASTM A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and BilletsASTM E 45 Determining the Inclusion Content of SteelASTM E 112 Determining Average Grain SizeASTM E 350 Chemical Ana
15、lysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought IronASTM E 384 Knoop and Vickers Hardness of Materials3. TECHNICAL REQUIREMENTS3.1 CompositionShall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with A
16、STM E 350, by spectrochemical methods, or by other analytical methods acceptable to purchaser.SAE INTERNATIONAL AMS6340B Page 3 of 9TABLE 1 - COMPOSITIONElement min maxCarbon 0.28 0.33Manganese 0.65 1.00Silicon 0.15 0.35Phosphorus - 0.015Sulfur - 0.015Chromium 0.75 1.00Nickel 1.65 2.00Molybdenum 0.3
17、5 0.50Vanadium 0.05 0.10Copper - 0.353.1.1 Check AnalysisComposition variations shall meet the applicable requirements of AMS2259.3.2 Melting PracticeSteel shall be multiple melted using consumable electrode vacuum process in the remelt cycle.3.3 ConditionThe product shall be supplied in the followi
18、ng condition; hardness and tensile strength shall be determined in accordance with ASTM A 370:3.3.1 Bars3.3.1.1 Bars 0.500 Inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel SidesCold finished having tensile strength not higher than 130 ksi (896 MPa), or equivalent hard
19、ness (See 8.2).3.3.1.2 Bars Over 0.500 Inch (12.70 mm) in Nominal Diameter or Least Distance Between Parallel SidesHot finished, and annealed if necessary, unless otherwise ordered, having hardness not higher than 241 HB, or equivalent (See 8.3). Bars ordered cold finished may have hardness as high
20、as 248 HB, or equivalent (See 8.3). 3.3.1.3 Bar shall not be cut from plate (Also see 4.4.2).3.3.2 ForgingsNormalized and tempered having hardness not higher than 269 HB, or equivalent (See 8.3). 3.3.3 Mechanical TubingCold finished, unless otherwise ordered, having hardness not higher than 25 HRC,
21、or equivalent (See 8.3). Tubing ordered hot finished and annealed shall have hardness not higher than 99 HRB, or equivalent (See 8.3).3.3.4 Forging StockAs ordered by the forging manufacturer.3.4 PropertiesThe product shall conform to the following requirements; hardness and tensile testing shall be
22、 performed in accordance with ASTM A 370:SAE INTERNATIONAL AMS6340B Page 4 of 93.4.1 MacrostructureVisual examination of transverse full cross-sections from bars, billets, tube rounds, or forging stock, etched in accordance with ASTM A 604 in hot hydrochloric acid, shall show no pipe or cracks. Poro
23、sity, segregation, inclusions, and other imperfections shall be no worse than macrographs of ASTM A 604 shown in Table 2.TABLE 2 - MACROSTRUCTURE LIMITSClass Condition Severity1Freckles A2 White Spots A3 Radial Segregation B4 Ring Pattern B3.4.2 Micro-Inclusion RatingNo specimen shall exceed the lim
24、its shown in Table 3, determined in accordance with ASTM E 45, Method D.TABLE 3 - MICRO-INCLUSION RATING LIMITSAABBCCDDType Thin Heavy Thin Heavy Thin Heavy Thin HeavyWorst Field Severity 2.0 1.0 1.5 1.0 1.5 1.0 1.5 1.0Worst Field Frequency,maxmum a1a1a153Total Rateable Fields,Frequency, maximum b 1
25、 b 1 b 1 c 3a - Combined A+B+C, not more than 3 fieldsb - Combined A+B+C, not more than 8 fieldsc - Any number of lower rateable D-type thin fields per specimen is permitted3.4.2.1 Thickness of D-type heavy shall not exceed 0.0005 inch (12.7 m).3.4.2.2 A rateable field is defined as one that has a t
26、ype A, B, C, or D inclusion rating of at least 1.0 thin or heavy in accordance with ASTM E 45.3.4.3 Average Grain Size of Bar, Forgings and TubingShall be ASTM No. 5 or finer, determined in accordance with ASTM E 112.3.4.4 Hardenability of Each HeatShall be J 14/16 inch (22.23 mm) = 49 HRC minimum,
27、and J 24/16 inch (38.10 mm) = 45 HRC minimum, determined on the standard end-quench test specimen in accordance with ASTM A 255 except that the steel shall be normalized at 1700 F 10 (927 C 6) and the specimen austenitized at 1550 F 10 (843 C 6). 3.4.5 Decarburization3.4.5.1 Bars and tubing ordered
28、ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces. Decarburization on tubing ID shall not exceed the maximum depth specified in 3.4.5.4.3.4.5.2 Allowable decarburization of bars, billets, and tube rounds or tubing ordered for redrawing or forg
29、ing or to specified microstructural requirements shall be as agreed upon by purchaser and vendor.3.4.5.3 Decarburization of bars to which 3.4.5.1 or 3.4.5.2 is not applicable shall be not greater than shown in Table 4.SAE INTERNATIONAL AMS6340B Page 5 of 9TABLE 4A - MAXIMUM TOTAL DEPTH OF DECARBURIZ
30、ATION, INCH/POUND UNITSNominal Diameter or DistanceBetween Parallel SidesInchesTotal Depth of DecarburizationInchUp 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 1.500 to 2.000, incl 0.030Over 2.00
31、0 to 2.500, incl 0.035Over 2.500 to 3.000, incl 0.040Over 3.000 to 4.000, incl 0.045TABLE 4B - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, SI UNITSNominal Diameter or DistanceBetween Parallel SidesMillimetersTotal Depth of DecarburizationMillimetersUp to 9.52, incl 0.38Over 9.52 to 12.70, incl 0.43Over
32、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 1.143.4.5.3.1 Limits for depth of decarburization of bars over 4.000 inches (101.60 mm) in nominal
33、 diameter or distance between parallel sides shall be as agreed upon by purchaser and vendor.3.4.5.4 Decarburization of tubing to which 3.4.5.1 or 3.4.5.2 is not applicable shall be not greater than shown in Table 5.TABLE 5A - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, INCH/POUND UNITSNominal Wall Thic
34、knessInchesTotal Depth ofDecarburizationInchIDTotal Depth ofDecarburizationInchODUp to 0.109, incl 0.008 0.015Over 0.109 to 0.203, incl 0.010 0.020Over 0.203 to 0.400, incl 0.012 0.025Over 0.400 to 0.600, incl 0.015 0.030Over 0.600 to 1.000, incl 0.017 0.035Over 1.000 0.020 0.040SAE INTERNATIONAL AM
35、S6340B Page 6 of 9TABLE 5B - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, SI UNITSNominal Wall ThicknessMillimetersTotal Depth ofDecarburizationMillimeterIDTotal Depth ofDecarburizationMillimetersODUp to 2.77, incl 0.20 0.38Over 2.77 to 5.16, incl 0.25 0.51Over 5.16 to 10.16, incl 0.30 0.64Over 10.16 to
36、15.24, incl 0.38 0.76Over 15.24 to 25.40, incl 0.43 0.89Over 25.40 0.51 1.023.4.5.5 Decarburization shall be measured by the microscopic method or by the microhardness traverse method using microhardness testing in accordance with ASTM E 384. The microhardness method shall be conducted on a hardened
37、 but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization, when measured by a microhardness method, is defined as the perpendicular distance from the surface to the depth under that surface where there is no further increase in ha
38、rdness. Such measurements shall be far enough away from any adjacent surface to be uninfluenced by decarburization on the adjacent surface. In case of dispute, the depth of decarburization determined using the microhardness traverse method shall govern.3.4.5.5.1 When determining the depth of decarbu
39、rization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the above limits by more than 0.005 inch (0.13 mm) and the width is 0.065 inch (1.65 mm) or less.3.4.6 Response to Heat Treatment for Bars, Forgings and TubingSpecimens shall meet the foll
40、owing requirements after being normalized by heating to 1700 F 10 (927 C 6), holding at heat for not less than 1 hour, and cooling in air; hardened by heating to 1550 F 10 (843 C 6), holding at heat for 1 hour 0.2, and quenching in oil, and heated to the required tempering temperature, held at heat
41、for not less than 1 hour, and cooled in air.3.4.6.1 Longitudinal Tensile PropertiesShall be as shown in Table 6; testing in the longitudinal direction need not be performed on product tested in the transverse direction.TABLE 6 - MINIMUM TENSILE PROPERTIESProperty ValueTensile Strength 220.0 ksi (151
42、7 MPa)Yield Strength at 0.2% Offset 185.0 ksi (1276 MPa)Elongation in 4D 10%Reduction of Area 35%3.4.6.2 Transverse Tensile PropertiesShall be as shown in Table 7, determined on specimens selected and prepared in accordance with AMS2310; transverse tensile requirements of Table 7 apply only to produ
43、ct that tensile specimens not less than 2.50 inches (63.5 mm) in length can be taken.SAE INTERNATIONAL AMS6340B Page 7 of 9TABLE 7A - MINIMUM TENSILE PROPERTIES, INCH/POUND UNITSCross-Sectional AreaSquare InchesTensileStrengthksiYield Strengthat 0.2% OffsetksiReduction ofArea%, AverageReduction ofAr
44、ea%, IndividualUp to 144, incl 220.0 185.0 35 30Over 144 to 225, incl 220.0 185.0 30 25Over 225 220.0 185.0 25 20TABLE 7B - MINIMUM TENSILE PROPERTIES, SI UNITSCross-Sectional AreaSquare CentimetersTensileStrengthMPaYield Strengthat 0.2% OffsetMPaReduction ofArea%, AverageReduction ofArea%, Individu
45、alUp to 929, incl 1517 1276 35 30Over 929 to 1452, incl 1517 1276 30 25Over 1452 1517 1276 25 203.5 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 s
46、hall be premium aircraft-quality conforming to AMS2300 except that a maximum average frequency (F) rating of 0.10 and a maximum average severity (S) rating of 0.20 shall apply.3.5.2 Bars and mechanical tubing ordered hot rolled or cold drawn, or ground, turned, or polished, shall, after removal of t
47、he 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 flash-line end grain, shall follow the general contour of the forgings s
48、howing no evidence of reentrant grain flow.3.6 Tolerances3.6.1 BarsIn accordance with AMS2251.3.6.2 Mechanical TubingIn 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 responsibl
49、e 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. 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 (3.4.4), decarburizati
