1、AEROSPACE MATERIAL SPECIFICATIONAMS6429 REV. HIssued 1960-06Revised 2014-07Superseding AMS6429GSteel Bars, Forgings, Tubing, and Rings0.78Cr - 1.8Ni - 0.35Mo - 0.20V (0.33 - 0.38C) (4335 Mod)Consumable Electrode Vacuum Melted(Composition similar to UNS K33517)RATIONALEAMS6429H is a Five Year Review
2、and update of this specification that revises cutting restrictions, macrostructure, steel cleanliness, 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, flash welded ring
3、s, and stock for forging or flash welded rings.1.2 ApplicationThese products have been used typically for heat treated parts up to 4 inches (1102 mm) round or equivalent cross-section that may be welded during fabrication, requiring through-hardening to high strength levels and that may be used at o
4、perational stress levels approaching the yield strength, but usage is not limited to such applications. This steel may become notch-sensitive when heat treated to a tensile strength level of 240 ksi (1655 MPa) or higher.1.2.1 Certain design and processing procedures may cause these products to becom
5、e susceptible to stress-corrosion cracking after heat treatment. ARP1110 recommends 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 sup
6、plier 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 has been specified, the last published issue of that document shall apply.2.1 SAE PublicationsAvailable from SAE Internatio
7、nal, 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-Alloy Steel BarsAMS2253 Tolerances, Carbon and Alloy Steel Tubing_SAE Technical Standards Board Rules provide that: “This report is pub
8、lished 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 therefrom, is the sole responsibility of the user.”SAE reviews each technica
9、l 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 publication may be reproduced, stored in a retrieval system or transmitted,
10、 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: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS
11、: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS6429HSAE INTERNATIONAL AMS6429H Page 2 of 9AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon SteelsAMS2300 Steel Cleanliness, Premium Aircraf
12、t-Quality, Magnetic Particle Inspection ProcedureAMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging StockAMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel ForgingsAMS2806 Identification, Bars, Wire, Mechanical Tubing, and
13、Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and AlloysAMS2808 Identification, ForgingsAMS7496 Rings, Flash Welded, Carbon and Low-Alloy SteelsARP1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corrosion-Resistant Steels and AlloysAS1182 Standa
14、rd 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 Determining Hardenabilit
15、y 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 Analysis of Carbon Steel, Low-Alloy Steel, Sil
16、icon 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 ASTM E 350, by spectrochemical methods, or b
17、y other analytical methods acceptable to purchaser.SAE INTERNATIONAL AMS6429H Page 3 of 9TABLE 1 - COMPOSITIONElement min maxCarbonManganeseSiliconPhosphorusSulfurChromiumNickelMolybdenumVanadiumCopper0.330.600.40-0.651.650.300.17-0.380.900.600.0100.0100.902.000.400.230.353.1.1 Check AnalysisComposi
18、tion variations shall meet the applicable requirements of AMS2259 except that carbon shall vary not more than 0.01 under minimum or over maximum, and no variation over maximum will be permitted for phosphorus and sulfur.3.2 Melting PracticeSteel shall be multiple melted using consumable electrode va
19、cuum process in the remelt cycle.3.3 ConditionThe product shall be supplied in the following 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 SidesA
20、nnealed and cold finished having tensile strength not higher than 130 ksi (896 MPa), or equivalent hardness (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, unless otherwise ordered, having hardness not higher th
21、an 248 HB, or equivalent (See 8.3). Bars ordered cold finished may have hardness as high as 262 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 Forgings and Flash Welded RingsAs ordered.3.3.2.1 Flash welded rings shall not be supplied unless specified or pe
22、rmitted on purchasers part drawing. When supplied, rings shall be manufactured in accordance with AMS7496.3.3.3 Mechanical TubingCold finished, unless otherwise ordered, having hardness not higher than 25 HRC, or equivalent (See 8.3). Tubing ordered hot finished and annealed shall have hardness not
23、higher than 99 HRB, or equivalent (See 8.3).3.3.4 Stock for Forgings or Flash Welded RingsAs ordered by the forging or flash welded ring manufacturer.SAE INTERNATIONAL AMS6429H Page 4 of 93.4 PropertiesThe product shall conform to the following requirements; hardness and tensile testing shall be per
24、formed in accordance with ASTM A 370:3.4.1 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. Porosity, segregation, inclusions, and other im
25、perfections shall be no worse than the macrographs of ASTM A 604 shown in Table 2.TABLE 2 - MACROSTRUCTURE LIMITSClass Condition Severity1234FrecklesWhite SpotsRadial SegregationRing PatternAABB3.4.2 Micro-Inclusion Rating of Each HeatNo specimen shall exceed the limits shown in Table 3, determined
26、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,maximum a1a1a153Total Rateable Fields,Frequency, maximum b 1 b 1 b 1 c 3a - Combined A+B+C,
27、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 which has a type A, B, C, or D inclusion rat
28、ing of at least 1.0 thin or heavy in accordance with ASTM E 45.3.4.3 Hardenability of each heatShall be J 1/16 inch (1.6 mm) = 58 HRC maximum and J 15/16 inch (23.8 mm) = 48 HRC minimum, determined on the standard end-quench test specimen in accordance with ASTM A 255, except that the steel shall be
29、 normalized at 1700 F 10 (927 C 6) and the specimen austenitized at 1625 F 10 (885 C 6). 3.4.4 Average Grain Size of Bars, Forgings, Tubing and Flash Welded RingsShall be ASTM No. 5 or finer, determined in accordance with ASTM E 112. SAE INTERNATIONAL AMS6429H Page 5 of 93.4.5 Decarburization3.4.5.1
30、 Bars, tubing, and flash welded rings ordered 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 Table 5.3.4.5.2 Allowable decarburization of bars, billets, and tube
31、rounds ordered for redrawing, forging, or flash welding or to specified microstructural requirements shall be as agreed upon by purchaser and vendor.3.4.5.3 Decarburization of bars and flash welded rings to which 3.4.5.1 or 3.4.5.2 is not applicable shall be not greater than shown in Table 4.TABLE 4
32、A - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, INCH/POUND UNITSNominal Diameter or DistanceBetween Parallel SidesInchesTotal Depth ofDecarburizationInchUp to 0.375, inclOver 0.375 to 0.500, inclOver 0.500 to 0.625, inclOver 0.625 to 1.000, inclOver 1.000 to 1.500, inclOver 1.500 to 2.000, inclOver 2.00
33、0 to 2.500, inclOver 2.500 to 3.000, inclOver 3.000 to 4.000, incl0.0100.0120.0140.0170.0200.0250.0300.0350.045TABLE 4B - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, SI UNITSNominal Diameter or DistanceBetween Parallel SidesMillimetersTotal Depth ofDecarburizationMillimetersUp to 9.52, inclOver 9.52 to
34、12.70, inclOver 12.70 to 15.88, inclOver 15.88 to 25.40, inclOver 25.40 to 38.10, inclOver 38.10 to 50.80, inclOver 50.80 to 63.50, inclOver 63.50 to 76.20, inclOver 76.20 to 101.60, incl0.250.300.360.430.510.640.760.891.143.4.5.4 Decarburization of tubing to which 3.4.5.1 or 3.4.5.2 is not applicab
35、le shall be not greater than shown in Table 5.TABLE 5A - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, INCH/POUND UNITSNominal Wall ThicknessInchesTotal Depth ofDecarburizationInchIDTotal Depth ofDecarburizationInchODUp to 0.109, inclOver 0.109 to 0.203, inclOver 0.203 to 0.400, inclOver 0.400 to 0.600, i
36、nclOver 0.600 to 1.000, inclOver 1.0000.0080.0100.0120.0150.0170.0200.0150.0200.0250.0300.0350.040SAE INTERNATIONAL AMS6429H Page 6 of 9TABLE 5B - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, SI UNITSNominal Wall ThicknessMillimetersTotal Depth ofDecarburizationMillimeterIDTotal Depth ofDecarburizationMi
37、llimetersODUp to 2.77, inclOver 2.77 to 5.16, inclOver 5.16 to 10.16, inclOver 10.16 to 15.24, incl Over 15.24 to 25.40, inclOver 25.400.200.250.300.380.430.510.380.510.640.760.891.023.4.5.5 Decarburization shall be measured by the microscopic method or by the microhardness traverse method using mic
38、rohardness testing in accordance with ASTM E 384. The microhardness 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 a microhardness method, is defined as the perpe
39、ndicular distance from the surface to the depth under that surface where there is no further increase in hardness. 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 dete
40、rmined using the microhardness traverse method shall govern.3.4.5.5.1 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 inch (0.13 mm) and the width is 0.065 inch (1
41、.65 mm) or less.3.4.6 Response to Heat Treatment of Bars, Forgings, Tubing and Flash Welded RingsTensile specimens shall meet the requirements shown in Table 6 after being hardened by heating to 1625 F 25 (885 C 14), holding at heat for 60 minutes 5, and quenching in oil and tempered by heating to a
42、 temperature between 400 and 500 F (204 and 260 C), holding at heat for not less than 2 hours, and cooling in air.TABLE 6 - MINIMUM TENSILE PROPERTIESProperty ValueTensile Strength 240.0 ksi (1655 MPa)Yield Strength at 0.2% Offset 210.0 ksi (1448 MPa)Elongation in 4DLongitudinalTransverse10% 7%3.4.6
43、.1 Tensile specimens shall be taken in the transverse direction from all product from which a specimen not less than 2.50 inches (63.5 mm) long can be obtained.3.4.6.2 Testing in the longitudinal direction need not be performed on product tested in the transverse direction.3.5 QualityThe product, as
44、 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 shall be premium aircraft-quality conforming to AMS2300 except that a maximum average frequency (F) rating of 0.10 and a ma
45、ximum average severity (S) rating of 0.20 shall apply.SAE INTERNATIONAL AMS6429H Page 7 of 93.5.2 Bars, mechanical tubing and flash welded rings 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
46、 free from seams, laps, tears, and cracks open to the ground, turned, or polished surface.3.5.3 Grain flow of die forgings, except in areas which 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 BarsIn acco
47、rdance 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 responsible for the performance of all required tests. Purchaser reserves the right
48、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), hardenability (3.4.3), average
49、 grain size (3.4.4), decarburization (3.4.5), and tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicable.4.2.2 Periodic TestsResponse to heat treatment (3.4.6), frequency-severity cleanliness (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 unless frequency of testing is specified by pu
