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 theref
2、rom, 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 2016 SAE InternationalAll rights reserved. No part of this publi
3、cation 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: +1 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS6374DAEROSPACEMATERIAL SPECIFICATIONAMS6374 REV. DIssued 1985-07Reaffirmed 2006-01Revised
5、2016-01Superseding AMS6374CSteel Tubing, Seam-Free, Round0.95Cr - 0.20Mo (0.28 - 0.33C) (SAE 4130)95.0 ksi (655 MPa) Tensile Strength(Composition similar to UNS G41300)RATIONALEAMS6374D results from a Five Year Review and update of this specification that revises classification of frequency-severity
6、 tests and reporting.1. SCOPE1.1 FormThis specification covers an aircraft-quality, low-alloy steel in the form of round, non-welded tubing free from OD surface seams.1.2 ApplicationThis product has been used typically for use in airframe tubular parts requiring a minimum tensile strength of 95.0 ks
7、i (655 MPa) as received, or up to 180.0 ksi (1241 MPa) after heat treatment, but usage is not limited to such applications.2. APPLICABLE DOCUMENTSThe 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 su
8、pplier 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 PublicationsAvailable from SAE Internati
9、onal, 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.AMS2253 Tolerances, Carbon and Alloy Steel TubingAMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon SteelsAMS2301 Steel Cleanliness, Airc
10、raft Quality, Magnetic Particle Inspection ProcedureSAE INTERNATIONAL AMS6374D Page 2 of 5AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging StockAMS2807 Identification, Carbon and Low-Alloy Steels, Corrosion and Heat-Resistant Steels and Alloys,
11、Sheet, Strip, Plate and Aircraft Tubing2.2 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM A370 Mechanical Testing of Steel ProductsASTM E112 Determining Average Grain SizeASTM E350 Chemi
12、cal Analysis of Carbon Steel, Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and Wrought Iron3. TECHNICAL REQUIREMENTS3.1 CompositionShall 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
13、 other analytical methods acceptable to purchaser.Table 1 - CompositionElement min maxCarbon 0.28 0.33Manganese 0.40 0.60Silicon 0.15 0.35Phosphorus - 0.025Sulfur - 0.025Chromium 0.80 1.10Molybdenum 0.15 0.25Nickel - 0.25Copper - 0.353.1.1 Check AnalysisComposition variations shall meet the applicab
14、le requirements of AMS2259.3.2 ConditionNormalized by air cooling from a temperature within the range 1600 to 1700 F (871 to 927 C), cold drawn, and stress relieved.3.3 FabricationTubing shall be produced by piercing, intermediate reduction, and drawing. Normalizing, followed by grinding or turning,
15、 shall be applied prior to final drawing in order to preclude decarburization and seams in the final product. Intermediate stress relief treatments may be applied before, and a final stress relief treatment shall be applied after, final drawing. A light polish to improve surface appearance may be em
16、ployed as a final operation.SAE INTERNATIONAL AMS6374D Page 3 of 53.4 PropertiesTubing shall conform to the following requirements; tensile testing shall be performed in accordance with ASTM A370:3.4.1 Tensile PropertiesShall be as shown in Table 2.Table 2 - Minimum tensile propertiesProperty ValueT
17、ensile Strength 95.0 ksi (655 MPa)Yield Strength at 0.2 Offset 75.0 ksi (517 MPa)Elongation in 2 inches (50.8 mm)Full TubeStrip12%7%3.4.2 Average Grain SizeShall be ASTM No. 5 or finer, determined in accordance with ASTM E112.3.4.3 DecarburizationTubing OD surface shall be free from decarburization.
18、 Tubing ID surface shall be free from complete (ferritic) decarburization, and partial decarburization shall be not greater than one-tenth of the wall thickness or 0.004 inch (0.10 mm), whichever is greater, determined visually on etched specimens at 100X magnification.3.5 QualityTubing, as received
19、 by purchaser, shall be uniform in quality and condition, sound, clean, with a surface finish conforming to the best practice for high quality aircraft tubing. Tubing OD shall be substantially free from seams (see 3.5.1); OD and ID shall be completely free from heavy scale, heavy oxide, burrs, tears
20、 grooves, cracks, laminations, slivers, pits, and other imperfections detrimental to usage of the tubing. Surface imperfections such as handling marks, straightening marks, light mandrel and die marks, shallow pits, and scale pattern are acceptable provided imperfections are removable within tolera
21、nces specified for wall thickness but removal of such imperfections is not required.3.5.1 The term “seams” does not include nonmagnetic inclusions. “Substantially free from seams” means that the following are not acceptable:3.5.1.1 Any piece of tubing found to contain a seam.3.5.1.2 Any lot of tubin
22、g from which a representative sample (see 4.3.1) has been found to contain more than one seam over 1/4 inch (6.4 mm) in length.3.5.2 Steel shall be aircraft quality conforming to AMS2301.3.6 TolerancesIn accordance to AMS2253 except that the tolerance for 1 inch (25 mm) and under OD shall be 0.003 i
23、nch (0.08 mm).4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe producer of tubing 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
24、necessary to ensure that the tubing conforms to specified requirements. SAE INTERNATIONAL AMS6374D Page 4 of 54.2 Classification of TestsAll technical requirements are acceptance tests and shall be performed on each heat or lot as applicable.4.3 Sampling and TestingShall be in accordance with AMS237
25、0 and the following:4.3.1 A representative sample (see 3.5.1.2) shall consist of at least one 6 inch (152 mm) long specimen, selected at random, from each 100 feet (30 m) of tubing or fraction thereof.4.3.1.1 For evaluation of nonmetallic inclusions (as supplement to the AMS2301 test), the represent
26、ative samples shall be machined and polished, or ground, to remove material from the OD surface equivalent to not less than 10% of the nominal wall thickness. 4.4 ReportsThe producer of tubing shall furnish with each shipment a report showing producer identity, country where the metal was melted (e.
27、g., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition of each heat and for tensile properties, average grain size and decarburization of each lot, and stating that the product conforms to the other technical requirements. This report s
28、hall include the purchase order number, heat and lot numbers, AMS6374D, size, and quantity.4.5 Resampling and RetestingShall be in accordance with AMS2370.5. PREPARATION FOR DELIVERY5.1 SizesExcept when exact lengths or multiples of exact lengths are ordered, straight tubing shall be supplied in mil
29、l lengths of 12 to 20 feet (3.7 to 6.1 m).5.2 IdentificationShall be in accordance with AMS2807.5.3 Protective TreatmentTubing shall be protected from corrosion prior to shipment. 5.4 PackagingTubing shall be prepared for shipment in accordance with commercial practice and in compliance with applica
30、ble rules and regulations pertaining to the handling, packaging, and transportation of the tubing to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENTA producer shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJ
31、ECTIONSTubing not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection.SAE INTERNATIONAL AMS6374D Page 5 of 58. NOTES8.1 Revision IndicatorA change bar (l) located in the left margin is for the convenience of the user in locating areas where tec
32、hnical 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, including technical revisions. Change bars and (R) are not used in original publications, nor in documents th
33、at 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 properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information.8.4 Purchase documents should specify not less than the following:AMS6374DSize of tubing desiredQuantity of tubing desired.PREPARED BY AMS COMMITTEE “E”
