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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (outside USA) 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/AMS6348D AEROSPACE MATERIAL SPECIFICATION AMS6348 REV. D Issued 1979-10 Reaffirme
5、d 2000-09 Revised 2013-10 Superseding AMS6348C Steel, Bars 0.95Cr - 0.20Mo (0.28 to 0.33C) (SAE 4130) Normalized (Composition similar to UNS G41300) RATIONALE AMS6348D results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers an aircraft-quality, l
6、ow-alloy steel in the form of bars. 1.2 Application These bars have been used typically for parts, 0.50 inch (12.7 mm) and under in section thickness or diamerter at time of heat treatment, requiring a through-hardening steel capable of developing hardness as high as 35 HRC when properly hardened an
7、d tempered and also parts of greater thickness but requiring proportionately lower hardness, but usage is not limited to such applications. 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 specif
8、ied 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 specified, the last published issue of that document shall apply. 2.1 SAE Publications Availabl
9、e 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 AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels AMS2301 Steel Cleanl
10、iness,Aircraft Quality, Magnetic Particle Inspection Procedure SAE INTERNATIONAL AMS6348D Page 2 of 6 AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging Stock AMS2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy
11、Steels and Corrosion and Heat-Resistant Steels and Alloys 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 Conshohocken, PA 19428
12、-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 Wrought Iron ASTM E
13、 381 Macroetch Testing Steel Bars, Billets, Blooms, and Forgings ASTM E 384 Knoop and Vickers Hardness of Materials 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, by spectrochemi
14、cal methods, or by other analytical methods acceptable to purchaser. TABLE 1 - COMPOSITION Element min max Carbon 0.28 0.33 Manganese 0.40 0.60 Silicon 0.15 0.35 Phosphorus - 0.025 Sulfur - 0.025 Chromium 0.80 1.10 Molybdenum 0.15 0.25 Nickel - 0.25 Copper - 0.35 3.1.1 Check Analysis Composition var
15、iations shall meet the applicable requirements of AMS2259. 3.2 Condition Bars shall be supplied in the following condition: 3.2.1 Bars 0.500 Inch (12.70 mm) and Under in Nominal Diameter or Least Distance Between Parallel Sides Normalized and cold finished. SAE INTERNATIONAL AMS6348D Page 3 of 6 3.2
16、.2 Bars Over 0.500 Inch (12.70 mm) in Nominal Diameter or Least Distance Between Parallel Sides Hot finished and normalized or normalized and cold finished, as ordered. 3.2.3 Bars shall not be cut from plate (Also see 4.4.2). 3.3 Properties Bars shall conform to the following requirements; hardness
17、testing shall be performed in accordance with ASTM A 370. 3.3.1 Macrostructure Visual examination of transverse full cross-sections from bars and billets, etched in hot hydrochloric acid in accordance with ASTM E 381, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfe
18、ctions shall be no worse than the macrographs of ASTM E 381 shown in Table 2. TABLE 2 - MACROSTRUCTURE LIMITS Cross-Sectional Area Square Inches Cross-Sectional Area Square Centimeters Macrographs Up to 36, incl Up to 232, incl S2 - R1 - C2 Over 36 to 133, incl Over 232 to 858, incl S2 - R2 - C3 Ove
19、r 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 organization. 3.3.2 Average Grain Size Shall be ASTM No. 5 or finer, determined in accordance with ASTM E 112.
20、3.3.3 Hardenability Shall be J5/16 inch (7.9 mm) = 34 HRC minimum and J8/16 inch (12.7 mm) = 27 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 test specimen austenitized at 1600 F
21、 10 (871 C 6). 3.3.4 Decarburization 3.3.4.1 Bars ordered ground, turned, or polished shall be free from decarburization on the ground, turned, or polished surfaces. 3.3.4.2 Allowable decarburization of bars and billets ordered for redrawing or to specified microstructural requirements shall be agre
22、ed 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 shown in Table 3. SAE INTERNATIONAL AMS6348D Page 4 of 6 TABLE 3A - MAXIMUM DEPTH OF DECARBURIZATION, INCH/POUND UNITS Nominal Diameter or Distance Between Paralle
23、l Sides Inches Total Depth of Decarburization Inch Up to 0.375, incl 0.010 Over 0.375 to 0.500, incl 0.012 Over 0.500 to 0.625, incl 0.014 Over 0.625 to 1.000, incl 0.017 Over 1.000 to 1.500, incl 0.020 Over 1.500 to 2.000, incl 0.025 Over 2.000 to 2.500, incl 0.030 Over 2.500 to 3.000, incl 0.035 O
24、ver 3.000 to 4.000, incl 0.045 TABLE 3B - MAXIMUM DEPTH OF DECARBURIZATION, SI UNITS Nominal Diameter or Distance Between Parallel Sides Millimeters Total Depth of Decarburization Millimeter Up to 9.52, incl 0.25 Over 9.52 to 12.70, incl 0.30 Over 12.70 to 15.88, incl 0.36 Over 15.88 to 25.40, incl
25、0.43 Over 25.40 to 38.10, incl 0.51 Over 38.10 to 50.80, incl 0.64 Over 50.80 to 63.50, incl 0.76 Over 63.50 to 76.20, incl 0.89 Over 76.20 to 101.60, incl 1.14 3.3.4.4 Decarburization shall be measured by the metallographic method or by a traverse method using microhardness testing in accordance wi
26、th 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 the microhardness method, is defined as the perpendicular distance from the surfac
27、e 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 surface. In case of dispute, the depth of decarburization determined using the microhardnes
28、s traverse method shall govern. 3.3.4.4.1 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 inches (0.13 mm) and the width is 0.065 inches (1.65 mm) or less. 3.4 Qua
29、lity Bars, 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 bars. 3.4.1 Steel shall be aircraft quality conforming to AMS2301. 3.4.2 Bars ordered hot rolled or cold drawn or ground, turned,
30、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 polished surface. 3.5 Tolerances Shall conform to all applicable requirements of AMS2251. SAE INTERNATIONAL AMS6348
31、D Page 5 of 6 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of bars 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 perform any confirmatory testing deemed nece
32、ssary to ensure that the bars conform to specified requirements. 4.2 Classification of Tests All technical requirements are acceptance tests and shall be performed on each heat or lot as applicable. 4.3 Sampling and Testing Shall be in accordance with AMS2370. 4.4 Reports 4.4.1 The producer of bars
33、shall furnish with each shipment a report showing 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 results of tests for composition, macrostructure, hardenability, and frequency-severity cleanliness rat
34、ing of each heat, and for average grain size of each lot, and stating that the product confoms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS6348D, size, and quantity. 4.4.2 Report the nominal metallurgically worked cross sectional
35、 size and the cut size, if different (Also see 3.2.3). 4.5 Resampling and Retesting Shall be in accordance with AMS2370. 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
36、 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 Shall be in accordance with AMS2806. 5.3 Protective Treatment Bars ordered cold drawn, cold rolled, ground, turned, or polished shall be protected from corrosion prior to shipmen
37、t. 5.4 Packaging Bars shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the bars to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A vendor shall i
38、nclude this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Bars not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. SAE INTERNATIONAL AMS6348D Page 6 of 6 8. NOTES 8.1 A
39、 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 this document. An (R) symbol to the left of the document title indicates a complete revision of the document, incl
40、uding technical revision. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and pro
41、perties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information. 8.4 Purchase documents should specify not less than the following: AMS6348D Whether hot or cold finish is required for bars over 0.500 inch (12.70 mm) (See 3.2.2) Size of bars desired Quantity of bars desired. 8.5 Similar Specifications AMS-S-6758 and MIL-S-6758 are listed for information only and shall not be construed as an acceptable alternate unless all requirements of this AMS are met. PREPARED BY AMS COMMITTEE “E“
