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 2017 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:/standards.sae.org/AMS6323M AEROSPACE MATERIAL SPECIFICATION AMS6323 REV. M Issued 1944-11 Reaffirmed 2007-04 Revi
5、sed 2017-09 Superseding AMS6323L Steel, Mechanical Tubing 0.50Cr - 0.55Ni - 0.25Mo (0.38 - 0.43C) (SAE 8740) (Composition similar to UNS G87400) RATIONALE AMS6323M results from a Five-Year Review and update of this specification that revises grain size determination (3.1.1 and 3.3.2), decarburizatio
6、n determination (3.3.4), quality (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 mechanical tubing. 1.2 Application This tubing has been used typically for parts, 0.375 inch
7、 (9.52 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 hardened and tempered, and also for parts of greater thickness but requiring proportionately lower hardness, but usage is not limited to such
8、 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 specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When
9、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 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1
10、724-776-4970 (outside USA), www.sae.org AMS2253 Tolerances Carbon and Alloy Steel Tubing AMS2259 Chemical Check Analysis Limits Wrought Low-Alloy and Carbon Steels AMS2301 Steel Cleanliness, Aircraft Quality Magnetic Particle Inspection Procedure SAE INTERNATIONAL AMS6323M Page 2 of 7 AMS2370 Qualit
11、y 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 Steels and Corrosion and Heat-Resistant Steels and Alloys ARP1917 Clarification of Terms Used in Aerospace Metals Speci
12、fications 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 19428-2959, Tel: 610-832-9585, www.astm.org ASTM A255
13、Determining Hardenability of Steel ASTM E18 Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials ASTM E112 Determining the Average Grain Size ASTM E140 Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Har
14、dness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness ASTM E350 Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron ASTM E381 Macroetch Testing Steel Bars, Billets, Blooms, and Forgings ASTM E384 Microindendation Hardness of Materials 3
15、. 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 E350, by spectrochemical methods, or by other analytical methods acceptable to purchaser. Table 1 - Composition Element Min Max Carbon 0.38
16、 0.43 Manganese 0.75 1.00 Silicon 0.15 0.35 Phosphorus - 0.025 Sulfur - 0.025 Chromium 0.40 0.60 Nickel 0.40 0.70 Molybdenum 0.20 0.30 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 g
17、rain size requirements of 3.3.2.2. SAE INTERNATIONAL AMS6323M Page 3 of 7 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2259. 3.2 Condition Cold finished, having hardness not higher than 25 HRC, or equivalent (see 8.2). Tubing ordered hot finished and annea
18、led or tempered shall have hardness not higher than 99 HRB, or equivalent. Hardness shall be determined in accordance with ASTM E18. 3.3 Properties Tubing shall conform to the following requirements: 3.3.1 Macrostructure Visual examination of transverse full cross-sections from tube rounds, etched i
19、n hot hydrochloric acid in accordance with ASTM E381, shall show no pipe or cracks. Porosity, segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM E381 shown in Table 2. Table 2 - Macrostructure limits Cross-Sectional Area Square Inches Cross-Sectional Area
20、 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 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 t
21、he 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 ASTM 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 austenit
22、ic 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%. 3.3.2.2.2 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%
23、. 3.3.3 Hardenability Shall be J 5/16 inch (7.9 mm) = 50 HRC minimum and J 8/16 inch (12.7 mm) = 40 HRC minimum, determined on the standard end-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
24、 1500 F 10 F (816 C 6 C). SAE INTERNATIONAL AMS6323M Page 4 of 7 3.3.4 Decarburization 3.3.4.1 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
25、 3. 3.3.4.2 Allowable decarburization of pierced billets, of tube rounds and tubing for redrawing or forging, or of tubing ordered to specified microstructural requirements shall be as agreed upon by purchaser and producer. 3.3.4.3 Decarburization of tubing that 3.3.4.1 or 3.3.4.2 is not applicable
26、shall be not greater than shown in Table 3. Table 3 Table 3A - Maximum depth of decarburization, inch/pound units Nominal Wall Thickness Inches Total Depth ID Inch Total Depth OD Inch Up to 0.109, incl 0.008 0.015 Over 0.109 to 0.203, incl 0.010 0.020 Over 0.203 to 0.400, incl 0.012 0.025 Over 0.400
27、 to 0.600, incl 0.015 0.030 Over 0.600 to 1.000, incl 0.017 0.035 Over 1.000 0.020 0.040 Table 3B - maximum depth of decarburization, SI units Nominal Wall Thickness Millimeters Total Depth ID Millimeter Total Depth OD Millimeters Up to 2.77, incl 0.20 0.38 Over 2.77 to 5.16, incl 0.25 0.51 Over 5.1
28、6 to 10.16, incl 0.30 0.64 Over 10.16 to 15.24, incl 0.38 0.76 Over 15.24 to 25.40, incl 0.43 0.89 Over 25.40 0.51 1.02 3.3.4.4 Decarburization Decarburization shall be evaluated by one of the two methods of 3.3.4.4.1 or 3.3.4.4.2, selected at the discretion of the producer. 3.3.4.4.1 Metallographic
29、 Method A cross section taken perpendicular to the surface shall be prepared, etched, and visually examined metallographically at a magnification not to exceed 100X. The product shall not show a layer of complete (ferrite) or partial decarburization exceeding the limits of Table 3. SAE INTERNATIONAL
30、 AMS6323M 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 microindentation hardness testing in accordance with ASTM E384, at a magnification not exceeding 100X, conducted on a hardened but untempered specimen protected
31、during heat treatment to prevent changes in surface carbon content. Depth of decarburization is defined as the perpendicular distance from the surface 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
32、 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 of decarburization, it is permissible to disregard local areas provided the decarburization of such areas does not exceed the limits of Table 3 by more t
33、han 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 using the microindentation hardness traverse method shall govern. 3.4 Quality Tubing, as received by purchaser, shall be uniform in quality and conditio
34、n, sound, and free from foreign materials and from imperfections detrimental to usage of the tubing. 3.4.1 Steel shall be aircraft quality conforming to AMS2301. 3.4.2 Mechanical tubing shall, be free from seams, laps, tears, and cracks after removal of the standard stock removal allowance in accord
35、ance with AS1182. 3.5 Tolerances Shall conform to all applicable requirements of AMS2253. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of tubing shall supply all samples for producers tests and shall be responsible for the performance of all required tests. Purchase
36、r reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the tubing conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests All technical requirements are acceptance tests and shall be performed on each heat or lot as appli
37、cable. 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 refining 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 perf
38、ormed 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 Shall be in accordance with AMS2370. SAE INTERNATIONAL AMS6323M Page 6 of 7 4.4 Reports 4.4.1 The producer of tubing shall furnish with each shipment
39、 a report showing 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 tests for composition, macrostructure, hardenability, and frequency-severity cleanliness rating of each heat and for hardne
40、ss and average grain size (if measured) for 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, AMS6323M, product form, size, and quantity. If the grain size requirement of 3.3.2 is met by the
41、 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. 4.4.2 When material produced to this specification is beyond the sizes allowed in the scope or ta
42、bles, or other exceptions are taken to the technical requirements listed in Section 3, (see 5.2.1) the report shall contain a statement “This material is certified as AMS6323M(EXC) because of the following exceptions:“ and the specific exceptions shall be listed. 4.5 Resampling and Retesting Shall b
43、e in accordance with AMS2370. 5. PREPARATION FOR DELIVERY 5.1 Sizes Except when exact lengths or multiples of exact lengths are ordered, straight 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 than 1
44、0 feet (3 m). 5.2 Identification Shall be in accordance with AMS2806. 5.2.1 When technical exceptions are taken (see 4.4.2), the material shall be marked with AMS6323M(EXC). 5.3 Protective Treatments Mechanical tubing ordered cold drawn, cold rolled, ground, turned, or polished shall be protected fr
45、om corrosion prior to shipment. 5.4 Packaging Tubing 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 tubing to ensure carrier acceptance and safe delivery. 6
46、. ACKNOWLEDGMENT A producer shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Tubing not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. SAE INTERNATIONA
47、L AMS6323M 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 editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document t
48、itle 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 Hardness conversion tables for metals are presented in ASTM E140. 8.3 Terms used in AMS are clarifie
49、d in ARP1917. 8.4 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; 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. 8.5 Purchase documents should specify not less than the following: AMS6323M Size of tubing desired Quantity of tubing desired 8.6 Gr
