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 there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this publication m
3、ay 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 (outside U
4、SA) Fax: 724-776-0790 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/AMS6308E AEROSPACE MATERIAL SPECIFICATION AMS6308 REV. E Issued 1986-04 Revised 2012-06 Super
5、seding AMS6308D Steel, Bars and Forgings 0.90Si - 1.0Cr - 2.0Ni - 3.2Mo - 2.0Cu - 0.10V (0.07 - 0.13C) Vacuum Arc or Electroslag Remelted (Composition similar to UNS K71040) RATIONALE AMS6308E results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification cove
6、rs a premium aircraft-quality, low-alloy steel in the form of bars, forgings, and forging stock. 1.2 Application These products have been used typically for highly-stressed carburized parts requiring high minimum case hardness and subject to very rigid magnetic particle inspection standards, but usa
7、ge is not limited to such applications. These products are suitable for service up to 450 F (232 C). 2. APPLICABLE DOCUMENTS The 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
8、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 Publications Available from SAE International, 400 Commonwea
9、lth 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 AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2300 Steel Cleanliness, Premium Aircraft-Quality, Magnet
10、ic Particle Inspection Procedure SAE AMS6308E Page 2 of 7 AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock AMS2372 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Forgings AMS2806 Identification, Bars, Wire, Mechanical T
11、ubing, and Extrusions, Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys AMS2808 Identification, Forgings AS1182 Standard Stock Removal Allowance, Aircraft-Quality and Premium Aircraft-Quality Steel Bars and Mechanical Tubing 2.2 ASTM Publications Available from ASTM Interna
12、tional, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A 370 Mechanical Testing of Steel Products ASTM A 604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets ASTM E 45 Determining the Inclusion Content of Steel A
13、STM E 112 Determining Average Grain Size ASTM E 350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods in
14、accordance with ASTM E 350, by spectrochemical methods, or other analytical methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min max Carbon 0.07 0.13 Manganese 0.25 0.50 Silicon 0.60 1.20 Phosphorus - 0.015 Sulfur - 0.010 Chromium 0.75 1.25 Nickel 1.60 2.40 Molybdenum 3.00 3.50 Copper
15、1.80 2.30 Vanadium 0.05 0.15 3.1.1 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Melting Practice Steel shall be multiple melted using either vacuum arc or electroslag practice in the remelt cycle. SAE AMS6308E Page 3 of 7 3.3 Condition The product shal
16、l be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A 370: 3.3.1 Bars Bar shall not be cut from plate. (Also see 4.4.2.) 3.3.1.1 Bars 0.500 Inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides Annealed
17、and cold-finished having tensile strength not higher than 135 ksi (931 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 Sides Hot finished and annealed, unless otherwise ordered, having hardness not higher than 277
18、HB, or equivalent (See 8.3). Bars ordered annealed and cold finished may have hardness as high as 285 HB, or equivalent (See 8.3). 3.3.2 Forgings Annealed. 3.3.3 Forging Stock As ordered by the forging manufacturer. 3.4 Properties The product shall conform to the following requirements; hardness tes
19、ting shall be performed in accordance with ASTM A 370: 3.4.1 Macrostructure Visual examination of transverse full cross-sections from bars, billets, and forging stock, etched in hot hydrochloric acid in accordance with ASTM A 604, shall show no pipe or cracks. Porosity, segregation, inclusions, and
20、other imperfections shall be no worse than the macrographs of ASTM A 604 shown in Table 2. TABLE 2 - MACROSTRUCTURE LIMITS Class Condition Severity 1 Freckles A 2 White Spots A 3 Radial Segregation B 4 Ring Pattern B SAE AMS6308E Page 4 of 7 3.4.2 Micro-Inclusion Rating of Each Heat No specimen shal
21、l exceed the limits shown in Table 3, determined in accordance with ASTM E 45, Method D. TABLE 3 - MICRO-INCLUSION RATING LIMITS A Thin A Heavy B Thin B Heavy C Thin C Heavy D Thin D Heavy Worst Field Severity 2.0 1.0 1.5 1.0 1.5 1.0 1.5 1.0 Worst Field Frequency, Maximum a 1 a 1 a 1 5 3 Total Ratea
22、ble Fields, Frequency, maximum b 1 b 1 b 1 c 3 a - Combined A + B + C, no more than 3 fields. b - Combined A + B + C, not more than 8 fields. c - Any number of lower rateable D-type thin fields per specimen is permissible. 3.4.2.1 Thickness of D-type heavy shall not exceed 0.0005 inch (12.7 m). 3.4.
23、2.2 A rateable field is defined as one that has a type A, B, C, or D inclusion rating of at least 1.0 thin or heavy in accordance with the Jernkontoret chart, Plate I-r, ASTM E 45 3.4.3 Average Grain Size of Bars and Forgings Shall be ASTM No. 6 or finer, determined in accordance with ASTM E 112. 3.
24、4.4 Response to Heat Treatment of Bars and Forgings Product, 4.0 inches (102 mm) and under in nominal cross-section, shall have hardness not lower than 34 HRC at any location after being heated to 1675 F 25 (913 C 14) held at heat for 15 to 30 minutes, and quenched in oil. 3.5 Quality The product, a
25、s 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. 3.5.2 Bars ordered hot rolled or cold drawn or ground, turned, o
26、r 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 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 genera
27、l contour of the forgings showing no evidence of reentrant grain flow. 3.6 Tolerances Bars shall conform to all applicable requirements of AMS2251. SAE AMS6308E Page 5 of 7 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of the product shall supply all samples for vendor
28、s tests and shall be responsible 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 Tests 4.2.1 Acceptance Tests Composition (3
29、.1), condition (3.3), macrostructure (3.4.1), micro-inclusion rating (3.4.2) average grain size (3.4.3), and tolerances (3.6) are acceptance tests and shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Response to heat treatment (3.4.4), frequency-severity cleanliness rating
30、(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 purchaser. 4.3 Sampling and Testing 4.3.1 Bars and Forging Stock In accordance with AMS2370. 4.3.2 Forgings In accordance with A
31、MS2372. 4.4 Reports 4.4.1 The vendor of bars and forgings shall furnish with each shipment a report showing the results of tests for composition, macrostructure, and micro-inclusion rating of each heat, and for condition and average grain size of each lot, and stating that the product conforms to th
32、e other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6308E, product form, size, and quantity. If forgings are supplied, the size and melt source of the stock used to make the forgings shall also be included. 4.4.2 If the ship size/shape is cut
33、 from a larger cross section, report the nominal metallurgically worked size (See 3.3.1). 4.4.3 The vendor of forging stock shall furnish with each shipment a report showing the results of tests for composition, macrostructure, micro-inclusion rating of each heat. This report shall include the purch
34、ase order number, heat number, AMS6308E, size and quantity. 4.5 Resampling and Retesting 4.5.1 Bars and Forging Stock In accordance with AMS2370. 4.5.2 Forgings In accordance with AMS2372. SAE AMS6308E Page 6 of 7 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exact
35、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 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
36、.3 Forging Stock As agreed upon by purchaser and vendor. 5.3 Protective Treatment Bars ordered 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
37、 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. ACKNOWLEDGMENT A vendor shall include this specification number and its revision letter in all quotations and when acknowle
38、dging purchase orders. 7. REJECTIONS Product not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not e
39、ditorial 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 in documents that contain editorial ch
40、anges only. 8.2 Tensile strength to hardness conversions 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;
41、dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. SAE AMS6308E Page 7 of 7 8.6 Purchase documents should specify not less than the following: AMS6308E Product form and size (and/or part number, if applicable) of product desired Quantity of product desired. PREPARED BY AMS COMMITTEE “E“
