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 ther
2、efrom, 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 2017 SAE International All rights reserved. No part of this
3、publication 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: +1 724-776-49
4、70 (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:/standards.sae.org/AMS6349E AEROSPACE MATERIAL SPECIFICATION AMS6349 REV. E Issued 1979-10 Revised 2017-12 Supers
5、eding AMS6349D Steel Bars 0.95Cr - 0.20Mo (0.38 to 0.43C) (SAE 4140) Normalized (Composition similar to UNS G41400) RATIONALE AMS6349E results from a Five-Year Review and update of this document that revises grain size determination (3.1.1 and 3.3.2), decarburization determination (3.3.4), quality (
6、3.4.2), testing frequency (4.2), reporting (4.4) and identification (5.2.1). 1. SCOPE 1.1 Form This specification covers an aircraft-quality, low-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 at time
7、of heat treatment requiring a through-hardening steel capable of developing hardness as high as 50 HRC when properly hardened and tempered and also for parts of greater thickness requiring proportionately lower hardness, but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issu
8、e 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 document issue is specified. When the referenced document has been cancelled and
9、no superseding document has been 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 +1 724-776-4970 (outside USA), www.sae.org. AMS225
10、1 Tolerances Low-Alloy Steel Bars AMS2259 Chemical Check Analysis Limits Wrought Low-Alloy and Carbon Steels AMS2301 Steel Cleanliness, Aircraft Quality Magnetic Particle Inspection Procedure SAE INTERNATIONAL AMS6349E Page 2 of 7 AMS2370 Quality Assurance Sampling and Testing Carbon and Low-Alloy S
11、teel Wrought Products and Forging Stock AMS2806 Identification Bars, Wire, Mechanical Tubing, and Extrusions Carbon and Alloy Steels and Corrosion and Heat-Resistant Steels and Alloys ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS1182 Standard Stock Removal Allowance Aircr
12、aft-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 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A255 Determining Hardenability of Steel ASTM A370 Mechanica
13、l Testing of Steel Products ASTM E112 Determining Average Grain Size ASTM E140 Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness ASTM E350 Chemical Analysis of
14、Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E381 Macroetch Testing, Inspection, and Rating Steel Products, Comprising Bars, Billets, Blooms, and Forgings ASTM E384 Microindentation Hardness of Materials 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall co
15、nform to the percentages by weight shown in Table 1, determined by wet chemical methods in accordance with ASTM E350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. Table 1 Composition Element Min Max Carbon 0.38 0.43 Manganese 0.75 1.00 Silicon 0.15 0.35 Phospho
16、rus - 0.025 Sulfur - 0.025 Chromium 0.80 1.10 Molybdenum 0.15 0.25 Nickel - 0.25 Copper - 0.35 3.1.1 Aluminum, vanadium and columbium are optional grain refining elements and need not be determined or reported unless used to satisfy the average grain size requirements of 3.3.2.2. 3.1.2 Check Analysi
17、s Composition variations shall meet the applicable requirements of AMS2259. SAE INTERNATIONAL AMS6349E Page 3 of 7 3.2 Condition Bars shall be supplied in the following condition; hardness and tensile strength shall be determined in accordance with ASTM A370. Bars shall not be cut from plate (also s
18、ee 4.4.2). 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 having tensile strength not higher than 125 ksi or equivalent hardness (see 8.2). 3.2.2 Bars Over 0.500 Inch (12.70 mm) in Nominal Diameter or Least Distanc
19、e Between Parallel Sides Hot finished and normalized or normalized and cold finished, as ordered, having hardness not higher than 229 HB or equivalent (see 8.3). Product ordered normalized and cold finished shall have hardness not higher than 241 HB or equivalent (see 8.3). 3.3 Properties Bars shall
20、 conform to the following requirements: 3.3.1 Macrostructure Visual examination of transverse full cross sections from bars and billets, etched in hot hydrochloric acid in accordance with ASTM E381, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no
21、worse than the macrographs of ASTM E381 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 Over 133 Over 858 Note
22、1 Note 1: Limits for larger sizes shall be agreed upon by purchaser and producer. The purchaser shall have written approval of the agreement from the cognizant engineering organization. 3.3.2 Average Grain Size Average grain size shall be determined by either 3.3.2.1 or 3.3.2.2. 3.3.2.1 Shall be AST
23、M No. 5 or finer, determined in accordance with ASTM E112. 3.3.2.2 The product of a heat shall be considered to have an ASTM No. 5 or finer austenitic grain size if one or more of the following are determined by heat analysis (see 8.5): 3.3.2.2.1 A total aluminum content of 0.020 to 0.050%. 3.3.2.2.
24、2 An acid soluble aluminum content of 0.015 to 0.050%. 3.3.2.2.3 A vanadium content of 0.02 to 0.08%. 3.3.2.2.4 A columbium content of 0.02 to 0.05%. 3.3.3 Hardenability of Each Heat Shall be J6/16 inch (9.5 mm) = 50 HRC minimum and J9/16 inch (14 mm) = 44 HRC minimum, determined on the standard end
25、-quench test specimen in accordance with ASTM A255 except that the steel shall be normalized at 1700 F 10 F (927 C 6 C) and the test specimen austenitized at 1550 F 10 F (843 C 6 C). SAE INTERNATIONAL AMS6349E Page 4 of 7 3.3.4 Decarburization 3.3.4.1 Bars ordered ground, turned, or polished shall b
26、e 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 as agreed upon by purchaser and producer. 3.3.4.3 Decarburization of bars that 3.3.4.1 or 3.3.4.2
27、 is not applicable shall be not greater than shown in Table 3. Table 3 Table 3A - Maximum depth of decarburization, inch/pound units Nominal Diameter or Distance Between Parallel 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.
28、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 Over 3.000 to 4.000, incl 0.045 Table 3B - Maximum depth of decarburization, SI units Nominal Diameter or Distance Between P
29、arallel Sides Millimeters Depth of Decarburization Millimeters 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 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
30、 Over 76.20 to 101.60, incl 1.14 3.3.4.4 Decarburization shall be evaluated by one of the two methods of 3.3.4.4.1 or 3.3.4.4.2. 3.3.4.4.1 Metallographic Method A cross section taken perpendicular to the surface shall be prepared, etched, and visually examined metallographically at a magnification n
31、ot to exceed 100X. The product shall not show a layer of complete (ferrite) or partial decarburization exceeding the limits of Table 3. SAE INTERNATIONAL AMS6349E Page 5 of 7 3.3.4.4.2 Hardness Traverse Method The total depth of decarburization shall be determined by a traverse method using microind
32、entation hardness testing in accordance with ASTM E384, at a magnification not exceeding 100X, conducted on a hardened but untempered specimen protected during heat treatment to prevent changes in surface carbon content. Depth of decarburization is defined as the perpendicular distance from the surf
33、ace to the depth under that surface where there is not 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. Acceptance shall be as listed in Table 3. 3.3.4.4.3 When determining the depth
34、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 (1.65 mm) or less. 3.3.4.4.4 In case of dispute, the total depth of decarburization determined usin
35、g the microindentation hardness traverse method shall govern. 3.4 Quality 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 AMS
36、2301. 3.4.2 Bars shall be free from seams, laps, tears, and cracks after removal of the standard stock removal allowance in accordance with AS1182. 3.5 Tolerances Shall conform to all applicable requirements of AMS2251. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer o
37、f bars shall supply all samples for producers 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 bars conform to specified requirements. 4.2 Classification of Tes
38、ts 4.2.1 Acceptance Tests Tests for all technical requirements are acceptance tests and shall be performed on each heat or lot as applicable. If grain refining elements (3.3.2.2) are not present, the ASTM E112 grain size test (3.3.2.1) shall be conducted on each lot. 4.2.2 Periodic Tests If grain re
39、fining elements (3.3.2.2) are present, the ASTM E112 grain size test (3.3.2.1) shall be conducted on a periodic basis and shall be performed at a frequency selected by the producer (not to exceed one year) unless frequency of testing is specified by purchaser 4.3 Sampling and Testing In accordance w
40、ith AMS2370. SAE INTERNATIONAL AMS6349E Page 6 of 7 4.4 Reports 4.4.1 The producer of the product shall furnish with each shipment a report showing producer identity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations), the results of c
41、omposition, macrostructure, hardenability, and frequency-severity cleanliness rating for each heat and hardness and average grain size (if measured) of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and l
42、ot numbers, AMS6349E, size, and quantity. If the grain size requirement of 3.3.2 is met by the aluminum, vanadium and/or columbium content, the aluminum, vanadium and/or columbium content shall be reported and a statement that the chemistry satisfies the grain size requirement shall be included. 4.4
43、.2 If the ship size/shape is cut from a larger cross section, report the nominal metallurgically worked size (see 3.2). 4.4.3 When material produced to this specification has exceptions taken to the technical requirements listed in Section 3, (see 5.2.1) the report shall contain a statement “This ma
44、terial is certified as AMS6349E(EXC) because of the following exceptions:“ and the specific exceptions shall be listed. 4.5 Resampling and Retesting: In accordance with AMS2370. 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, straight bars w
45、ill be acceptable in mill lengths of 6 to 20 feet (1.8 to 6.1 m) but not more 10% of any shipment shall be supplied in lengths shorter than 10 feet (3 m). 5.2 Identification In accordance with AMS2806. 5.2.1 When technical exceptions are taken (see 4.4.3), the material shall be marked with AMS6349E(
46、EXC). 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 Bars shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations perta
47、ining to the handling, packaging, and transportation of the bars to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A producer shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Bars not conforming to
48、 this specification, or to modifications authorized by purchaser, will be subject to rejection. SAE INTERNATIONAL AMS6349E Page 7 of 7 8. NOTES 8.1 Revision Indicator A change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions, not edito
49、rial 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 changes only. 8.2 Tensile strength to hardness conversions are presented in ASTM A370. 8.3 Hardness conversion tables
