1、AEROSPACE MATERIAL SPECIFICATION AMS6294 REV. J Issued 1939-12 Reaffirmed 2006-02 Revised 2014-07 Superseding AMS6294H Steel Bars and Forgings, Carburizing 1.8Ni - 0.25Mo (0.17 - 0.22C) (SAE 4620) (Composition similar to UNS G46200) RATIONALE AMS6294J results from a Five Year Review and update of th
2、is specification that revises macrostructure, acceptance tests and reporting requirements. 1. SCOPE 1.1 Form This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock. 1.2 Application These products have been used typically for carburized parts t
3、hat require high minimum core hardness and allow wide hardness range in sections 0.375 inch (9.5 mm) and under in nominal thickness, but usage is not limited to such applications. The core may or may not be machinable after hardening. 2. APPLICABLE DOCUMENTS The issue of the following documents in e
4、ffect 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 superseding document has been
5、specified, the last published issue of that document shall apply. 2.1 SAE Publications Available 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-Alloy Steel Bars A
6、MS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2301 Steel Cleanliness, Aircraft Quality, Magnetic Particle Inspection Procedure AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock _ SAE Technical Standards Board
7、 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 therefrom, is the sole responsibilit
8、y 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 International All rights reserved. No part of this publication may be reproduced, s
9、tored 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: 724-776-07
10、90 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS6294J SAE INTERNATIONAL AMS6294J Page 2 of 6 AMS2372 Quality Assurance Sampling and Testing, Carbon and Low-A
11、lloy Steel Forgings AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys AMS2808 Identification, Forgings AMS6290 Steel, Bars and Forgings, Carburizing, 1.8Ni - 0.25Mo (0.11 - 0.17C) (SAE 4615) AMS6292 Steel
12、 Bars and Forgings, Carburizing, 1.8Ni - 0.25Mo (0.15 - 0.20C) (SAE 4617) AS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Consho
13、hocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A 255 Determining Hardenability of Steel ASTM A 370 Mechanical Testing of Steel Products ASTM E 112 Determining Average Grain Size ASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wro
14、ught Iron ASTM E 381 Macroetch Testing Steel Bars, Billets, Blooms, and Forgings 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E 350 or by spectrographic methods, or by other analytica
15、l methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min max Carbon 0.17 0.22 Manganese 0.45 0.65 Silicon 0.15 0.35 Phosphorus - 0.025 Sulfur - 0.025 Nickel 1.65 2.00 Molybdenum 0.20 0.30 Chromium - 0.20 Copper - 0.35 3.1.1 Check Analysis Composition variations shall meet the applicable
16、requirements of AMS2259. 3.2 Condition The product shall be supplied in the following condition unless another condition is authorized by purchaser; hardness and tensile strength shall be determined in accordance with ASTM A 370: SAE INTERNATIONAL AMS6294J Page 3 of 6 3.2.1 Bars Bars 0.500 Inch (12.
17、70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides Cold finished having tensile strength not higher than 130 ksi (895 MPa) or equivalent hardness (See 8.2). 3.2.1.1 Bars Over 0.500 Inch (12.70 mm) in Nominal Diameter or Least Distance Between Parallel Sides Hot finished, u
18、nless otherwise ordered, having hardness not higher than 229 HB, or equivalent (See 8.3). Bars ordered cold finished may have hardness as high as 241 HB or equivalent (See 8.3). 3.2.1.2 Bar shall not be cut from plate (Also see 4.4.2). 3.2.2 Forgings As ordered. 3.2.3 Forging Stock As ordered by the
19、 forging manufacturer. 3.3 Properties The product shall conform to the following requirements; hardness testing shall be performed in accordance with ASTM A 370: 3.3.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets, and forging stock, etched in hot hydrochlori
20、c 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 macrograph ratings of ASTM E 381 shown in Table 2. TABLE 2 - MACROSTRUCTURE LIMITS Section Size Square Inches Section Size Square Centimeters Macr
21、ographs Up to 36, incl Up to 230, incl S2 - R1 - C2 Over 36 to 133, incl Over 230 to 858, incl S2 - R2 - C3 Over 133 Over 858 Note 1 Note 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
22、organization. 3.3.2 Average Grain Size of Bars and Forgings Shall be ASTM 5 or finer determined in accordance with ASTM E 112. 3.3.3 Hardenability of each heat Shall be J1/16 inch (1.6 mm) = 48 HRC maximum and J3/16 inch (4.8 mm) = 27 HRC minimum, determined on the standard end-quench test specimen
23、in accordance with ASTM A 255, except that the steel shall be normalized at 1700 F 10 (925 C 6) and the test specimen austenitized at 1700 F 10 (925 C 6). 3.4 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imp
24、erfections detrimental to usage of the product. SAE INTERNATIONAL AMS6294J Page 4 of 6 3.4.1 Steel shall be aircraft quality conforming to AMS2301. 3.4.2 Bars and tubing ordered hot rolled or cold drawn, or ground, turned, or polished, shall, after removal of the standard stock removal allowance in
25、accordance with AS1182, be free from seams, laps, tears, and cracks open to the machined, ground, turned, 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 flow.
26、 3.5 Tolerances 3.5.1 Bars In accordance with AMS2251. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The 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
27、 perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), condition (3.2), macrostructure (3.3.1), average grain size (3.3.2), hardenability (3.3.3) and frequency-severity cl
28、eanliness rating (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 Tests Grain flow of die forgings (3.4.3) is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of testing is specifie
29、d by purchaser. 4.3 Sampling and Testing 4.3.1 Bars and Forging Stock In accordance with AMS2370. 4.3.2 Forgings In accordance with AMS2372. SAE INTERNATIONAL AMS6294J Page 5 of 6 4.4 Reports 4.4.1 The producer of bars and forgings shall furnish with each shipment a report showing producer identity
30、and country where the metal was melted (e. g., final melt in the case of metal processed by multiple melting operations), the results of tests for composition, macrostructure, hardenability, and frequency-severity cleanliness rating of each heat, and of condition and average grain size of each lot,
31、and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6294J, product form and size or part number, and quantity. If forgings are supplied, the size and melt source of stock used to make the forgings sh
32、all 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 producer of forging stock shall furnish with each shipment a report showing producer identity and country where the metal was melted (e. g., final me
33、lt 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, AMS6294J, size and quantity 4.5 Resampl
34、ing and Retesting 4.5.1 Bars and Forging Stock In accordance with AMS2370. 4.5.2 Forgings In accordance with AMS2372. 5. PREPARATION FOR DELIVERY 5.1 Sizes Except 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.
35、1 m), but not more than 10% of any shipment shall be supplied in lengths shorter than 10 feet (3 m). 5.2 Identification 5.2.1 Bars In accordance with AMS2806. 5.2.2 Forgings In accordance with AMS2808. 5.2.3 Forging Stock As agreed upon by purchaser and vendor. 5.3 Protective Treatment Bars ordered
36、cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipment. 5.4 Packaging The product shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and
37、 transportation of the product to ensure carrier acceptance and safe delivery. SAE INTERNATIONAL AMS6294J Page 6 of 6 6. ACKNOWLEDGMENT A vendor shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTION Product not conformi
38、ng to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of
39、 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 in documents that contain editorial changes only. 8.2 Tensile strength to hardness conversions
40、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 and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius tem
41、peratures 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: AMS6294J Product form and size or part number of product desired Quantity of product desired. PREPARED BY AMS COMMITTEE “E”
