1、AEROSPACE MATERIAL SPECIFICATIONAMS6324 REV. JIssued 1945-05Reaffirmed 2000-09Revised 2014-08Superseding AMS6324HSteel Bars, Forgings, and Tubing0.65Cr - 0.70Ni - 0.25Mo (0.38 - 0.43C) (8740 Modified)(Composition similar to UNS K11640)RATIONALEAMS6324J results from a Five Year Review and update of t
2、his specification that revises the title, macrostructure, decarburization and reporting requirements.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 ApplicationThese products have been used typical
3、ly for parts, 0.750 inch (19.05 mm) and under in section thickness at time of heat treatment, requiring a through-hardening steel capable of developing hardness as high as 50 HRC when properly hardened and tempered and also parts of greater thickness but requiring proportionately lower hardness, but
4、 usage is not limited to such applications.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 documen
5、t 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 (insi
6、de 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 Steels_SAE Technical Standards Board Rules provide that: “This report is publish
7、ed 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 technical re
8、port 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, in
9、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: ht
10、tp:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS6324JSAE INTERNATIONAL AMS6324J Page 2 of 8AMS2301 Steel Cleanliness, Aircraft-Quality, Magnetic Particle Inspection AMS2370 Quality Assurance Sampling and Testing,
11、 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 Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and AlloysAMS2808 Id
12、entification, ForgingsAS1182 Standard Stock Removal Allowance Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing 2.2 ASTM PublicationsAvailable from ASTM Internatonal, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,Tel: 610-832-9585, www.astm.org.A
13、STM A 255 Determining Hardenability of SteelASTM A 370 Mechanical Testing of Steel ProductsASTM 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 Macroetch Testing Steel Bars, Billets, B
14、looms, and ForgingsASTM 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 by other analytical methods accep
15、table to purchaser.TABLE 1 - COMPOSITIONElement min maxCarbon 0.38 0.43Manganese 0.75 1.00Silicon 0.15 0.35Phosphorus - 0.025Sulfur - 0.025Chromium 0.55 0.75Nickel 0.55 0.85Molybdenum 0.20 0.30Copper - 0.353.1.1 Check AnalysisComposition variations shall meet the applicable requirements of AMS2259.S
16、AE INTERNATIONAL AMS6324J Page 3 of 83.2 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 Bars3.2.1.1 Bars 0.500 Inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Si
17、desCold finished having tensile strength not higher than 130 ksi (896 MPa).3.2.1.2 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 than 229 HB, or equivalent (See 8.2). Bars ord
18、ered cold finished may have hardness as high as 248 HB, or equivalent (See 8.2).3.2.1.3 Bar shall not be cut from plate (Also see 4.4.2).3.2.2 ForgingsAs ordered.3.2.3 Mechanical TubingCold finished, unless otherwise ordered, having hardness not higher than 25 HRC, or equivalent (See 8.2). Tubing or
19、dered hot finished and annealed shall have hardness not higher than 99 HRB, or equivalent (See 8.2).3.2.4 Forging StockAs ordered by the forging manufacturer.3.3 PropertiesThe product shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A 370:3.3.1
20、 MacrostructureVisual examination of transverse full cross-sections from bars, billets, tube rounds, and forging stock, etched in hot hydrochloric acid in accordance with ASTM E 381 shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the ma
21、crographs of ASTM E 381 shown in Table 2.TABLE 2 - MACROSTRUCTURE LIMITSCross-Section AreaSquare InchesCross-Section AreaSquare Centimeters MacrographsUp 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 si
22、zes shall be agreed upon by producer and purchaser. The purchaser shall have written approval of the agreement from the cognizant engineering organization.3.3.2 Average Grain Size of Bars, Forgings, and Mechanical TubingShall be ASTM No. 5 or finer, determined in accordance with ASTM E 112.SAE INTER
23、NATIONAL AMS6324J Page 4 of 83.3.3 Hardenability of Each HeatShall be J7/16 inch (11 mm) = 50 HRC minimum and J10/16 inch (16 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 t
24、he test specimen austenitized at 1525 F 10 (829 C 6). 3.3.4 Decarburization3.3.4.1 Bars and tubing 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 4.
25、3.3.4.2 Allowable decarburization of bars, billets, and tube rounds ordered for redrawing or forging or to specified microstructural requirements shall be as agreed 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 sh
26、own in Table 3.TABLE 3A - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, INCH/POUND UNITSNominal Diameter or DistanceBetween Parallel SidesInchesTotal Depth of DecarburizationInchUp 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 t
27、o 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 4.000, incl 0.040TABLE 3B - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, SI UNITSNominal Diameter or DistanceBetween Parallel SidesMillimetersTotal Depth of DecarburizationMillime
28、tersUp 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, 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 of tubing t
29、o which 3.3.4.1 or 3.3.4.2 is not applicable shall be not greater than shown in Table 4.SAE INTERNATIONAL AMS6324J Page 5 of 8TABLE 4A - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, INCH/POUND UNITSNominal Wall ThicknessInchesTotal Depth ofDecarburizationInchIDTotal Depth ofDecarburizationInchODUp to 0.1
30、09, 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 0.040TABLE 4B - MAXIMUM TOTAL DEPTH OF DECARBURIZATION, SI UNITSNominal Wall ThicknessMillimetersTotal Depth ofDeca
31、rburizationMillimeterIDTotal 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 15.24, incl 0.38 0.76Over 15.24 to 25.40, incl 0.43 0.89Over 25.40 0.51 1.023.3.4.5 Decarburization shall be measured by the met
32、allographic method or by a traverse method using microhardness 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 measure
33、d by the microhardness method, is defined as the perpendicular 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 any decarburization on the adjacent surf
34、ace. In case of dispute, the depth of decarburization determined using the microhardness traverse method shall govern.3.3.4.5.1 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 mor
35、e than 0.005 inch (0.13 mm) and the width is 0.065 inches (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 be aircraft-qua
36、lity conforming to AMS2301.3.4.2 Bars and mechanical tubing 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 machined, ground, turned, or pol
37、ished 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 Tolerances3.5.1 BarsShall be in accordance with AMS2251.SAE INTERNATIONAL AMS6324J Page 6 of 83.5.2 Mech
38、anical TubingShall be 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 performance of all required tests. Purchaser reserves the right to sample and to perf
39、orm 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 grain size (3.3.2), hardenability (3.3.3), decarburization (3.3.4), frequen
40、cy-severity cleanliness (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 periodic test and shall be performed at a frequency selected by the vendor unless a frequency of testing is
41、specified by purchaser.4.3 Sampling and Testing4.3.1 Bars, Mechanical Tubing, and Forging Stock: Shall be in accordance with AMS2370.4.3.2 ForgingsShall be in accordance with AMS2372.4.4 Reports4.4.1 The producer of bars, forgings, and mechanical tubing shall furnish with each shipment a report show
42、ing the producer identity and country where the metal was melted (e. g., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition, macrostructure, hardenability, and frequency-severity cleanliness rating of each heat, and for average grain si
43、ze of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6324J, product form and size (and/or part number, if applicable) and quantity. If forgings are supplied, the size and melt source o
44、f stock used to make the forgings shall also be included.4.4.2 Report the nominal metallurgically worked cross sectional size and the cut size, if different (Also see 3.2.1.3).4.4.3 The vendor of forging stock shall furnish with each shipment a report showing the producer identity and country where
45、the metal was melted (e. g., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition macrostructure, hardenability, and frequency-severity cleanliness rating of each heat. This report shall include the purchase order number, heat number, AMS
46、6324J, size and quantity.4.5 Resampling and Retesting4.5.1 Bars, Mechanical Tubing, and Forging StockShall be in accordance with AMS2370.SAE INTERNATIONAL AMS6324J Page 7 of 84.5.2 ForgingsShall be in accordance with AMS2372.5. PREPARATION FOR DELIVERY5.1 SizesExcept when exact lengths or multiples
47、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 than10 feet (3 m).5.2 Identification5.2.1 Bars and Mechanical TubingShall be in accordance with AMS2806.
48、5.2.2 ForgingsShall be in accordance with AMS2808.5.2.3 Forging StockAs agreed upon by purchaser and vendor.5.3 Protective TreatmentBars and tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosoion prior to shipment.5.4 PackagingThe product shall be prep
49、ared 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.6. ACKNOWLEDGMENTA vendor shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specific
