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 2010 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/AMS4942F AEROSPACE MATERIAL SPECIFICATION AMS4942 REV. F Issued 1964-01 Revised 2010-06 Super
5、seding AMS4942E Titanium Tubing, Seamless Annealed, 40.0 ksi (275 MPa) Yield Strength (Composition similar to UNS R50400) RATIONALE AMS4942F results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers one grade of commercially-pure titanium in the fo
6、rm of seamless tubing. 1.2 Application This tubing has been used typically for parts, such as fluid-conducting lines, requiring strength up to 400 F (205 C) and oxidation resistance up to 600 F (315 C), but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the following
7、 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 no superseding doc
8、ument 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 724-776-4970 (outside USA), www.sae.org. AMS2244 Tolerances, Titaniu
9、m and Titanium Alloy Tubing AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS2368 Sampling and Testing of Wrought Titanium Raw Material Except Forgings and Forging Stock AMS2750 Pyrometry AMS2809 Identification, Titanium and Titanium Alloy Wrought Products SAE AMS4942F Page 2
10、of 6 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 E8 / E 8M Tension Testing of Metallic Materials ASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys
11、 by the Inert Gas Fusion Technique ASTM E 1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection Method ASTM E 1941 Determination of Carbon in Refractory and Reactive Metals and Their Alloys ASTM E 2371 Analysis of Titanium and
12、Titanium Alloys by Atomic Emission Plasma Spectrometry 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight shown in Table 1; carbon shall be determined in accordance with ASTM E 1941, hydrogen in accordance with ASTM E 1447, oxygen and nitrogen in accordance with AST
13、M E 1409, and other elements in accordance with ASTM E 2371. Other analytical methods may be used if acceptable to the purchaser. TABLE 1 - COMPOSITION Element min max Iron Oxygen Carbon Nitrogen Hydrogen (3.1.2) Other Elements, each (3.1.1) Other Elements, total (3.1.1) Titanium - - - - - - - remai
14、nder0.30 0.25 0.10 0.03 0.0150.10 0.30 (300 ppm) (150 ppm) 3.1.1 Determination not required for routine acceptance. 3.1.2 Sample Size When using ASTM E 1447 for hydrogen determination, size may be as large as 0.35 gram. 3.1.3 Check Analysis Composition variations shall meet the applicable requiremen
15、ts of AMS2249. 3.2 Melting Practice 3.2.1 Alloy shall be produced by electron beam cold hearth or plasma arc cold hearth melting practice, or shall be multiple melted. When multiple melted, melting cycle(s) prior to the final melting cycle shall be made using vacuum consumable electrode, nonconsumab
16、le electrode, electron beam cold hearth, or plasma arc cold hearth melting practice(s). The final melting cycle shall be made under vacuum using vacuum arc remelting (VAR) practice with no alloy additions permitted. SAE AMS4942F Page 3 of 6 3.2.2 The atmosphere for nonconsumable electrode melting sh
17、all be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury. 3.2.3 The electrode tip for nonconsumable electrode melting shall be water-cooled copper. 3.3 Condition Cold reduced, and then annealed and descaled. Annealing shall consist of heating to 1200 t
18、o 1450 F (649 to 788 C), holding at the selected temperature within 25 F (14 C) for a time commensurate with product size and the heating equipment and procedure employed. The product shall then be air cooled or slower, and descaled. Pyrometry shall be in accordance with AMS2750. 3.4 Properties Tubi
19、ng shall conform to the following requirements: 3.4.1 Tensile Properties Shall be as specified in Table 2, determined in accordance with ASTM E 8 / E 8M with the rate of strain set at 0.005 inch/inch/minute (0.005 mm/mm/minute) and maintained within a tolerance of 0.002 inch/inch/minute (0.002 mm/mm
20、/minute) through the 0.2% offset yield strain. TABLE 2 - TENSILE PROPERTIES Property Value Tensile Strength 50.0 ksi (345 MPa) min Yield Strength at 0.2% Offset 40.0 to 65.0 ksi (276 to 448 MPa) Elongation in 2 inches (50.8 mm) 20% min 3.4.2 Flattening 3.4.2.1 Tubing with nominal wall thickness of 7
21、 to 15% of the nominal OD shall withstand, without cracking on the OD surface, flattening sideways at room temperature under a load applied gradually until the outside dimension under load is equal to 7 times the nominal wall thickness. 3.4.2.1.1 If tubing does not pass the flattening test, a sectio
22、n of tube shall withstand, without cracking, bending at room temperature through an angle of 180 degrees around a diameter equal to 5 times the nominal wall thickness of the tubing. The axis of the bend shall be parallel to the axis of the tube and the inside of the tube shall be on the inside of th
23、e bend. 3.4.2.2 Tubing with nominal wall thickness less than 7% or greater than 15% of the nominal OD shall have flattening or bending properties as agreed upon by purchaser and vendor. 3.4.3 Flarability Specimens as in 4.3.2.1 shall withstand flaring at room temperature, without formation of cracks
24、 or other visible defects, by being forced axially with steady pressure over a hardened and polished tapered steel pin having a 74-degree included angle to produce a flare having a permanent expanded OD not less than 1.30 times the original nominal OD. SAE AMS4942F Page 4 of 6 3.4.4 Pressure Testing
25、 Tubing shall show no bulges, leaks, pin holes, cracks, or other defects when subjected to an internal hydrostatic pressure (P) sufficient to cause a tensile stress (S) of 20.0 ksi (140 MPa) in the tubing wall. The hydrostatic pressure (P) shall be determined from Equation 1: PSD2d2D2d2+-=(Eq. 1) wh
26、ere: P = Test pressure in ksi (MPa) S = 20.0 ksi (140 MPa) tensile stress D = Nominal OD d = Nominal ID 3.4.5 Surface Contamination Tubing shall be free of any oxygen-rich layer, such as alpha case (See 8.2), or other surface contamination, determined by microscopic examination at not lower than 100
27、X magnification or by other methods agreed upon by purchaser and vendor. 3.5 Quality Tubing, as received by purchaser, shall be uniform in quality and condition and shall have a finish conforming to the best practice for high quality aircraft tubing. It shall be smooth and free from heavy scale or o
28、xide, burrs, seams, tears, grooves, 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 will not be considered injurious if the imperfec
29、tions are removable within the tolerances specified for wall thickness but removal of such imperfections is not required. 3.6 Tolerances Unless otherwise specified, tolerances shall conform to all applicable requirements of AMS2244; standard tolerances for diameter and wall thickness shall apply. 4.
30、 QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of tubing 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 necessary to ensur
31、e that the tubing conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensile properties (3.4.1), flattening (3.4.2), pressure test (3.4.4), surface contamination (3.4.5), and tolerances (3.6) are acceptance tests and shall be performed on each h
32、eat or lot as applicable. SAE AMS4942F Page 5 of 6 4.2.2 Periodic Tests Flarability (3.4.3) is a periodic test and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be in accordance with AMS2368 and the foll
33、owing: 4.3.1 For Acceptance Tests 4.3.1.1 Flattening Tests and Pressure Tests One or more samples from each lot. 4.3.1.1.1 Specimens for the alternate bend test of 3.4.2.1.1 shall be not less than 0.500 inch (12.50 mm) in length and shall embrace one-third to one-half the circumference of the tube.
34、Cut edges of the specimen shall be smooth and free from burrs. 4.3.2 For Periodic Tests As agreed upon by purchaser and vendor. 4.3.2.1 Specimens for flarability (3.4.3) test shall be full tubes or sections cut from a tube. The end of the specimen to be flared shall be cut square with the cut end sm
35、ooth and free from burrs but not rounded. 4.4 Reports The vendor shall provide a copy of the original material manufacturers report (material certification) including: producer name, product form, mill produced size, and country where the metal was melted (i.e., final melt in the case of metal proce
36、ssed by multiple melting operations). The vendor of tubing shall furnish with each shipment a report showing the results of tests for composition of each heat and for the hydrogen content, tensile properties, and surface contamination of each lot, and stating that the tubing conforms to the other te
37、chnical requirements. This report shall include the purchase order number, heat number, lot number, AMS4942F, size, and quantity from each heat. 4.5 Resampling and Retesting Shall be in accordance with AMS2368. 5. PREPARATION FOR DELIVERY 5.1 Identification Tubing shall be identified in accordance w
38、ith AMS2809. 5.2 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. ACKNOWLEDGMENT A
39、vendor shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders. SAE AMS4942F Page 6 of 6 7. REJECTIONS Tubing not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1
40、 A change bar (l) 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, in
41、cluding technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 An oxygen-rich layer, such as alpha case, is hard and brittle and results in marked lowering of fatigue properties. 8.3 Terms used in AMS are clarified in
42、 ARP1917 and as follows: 8.3.1 Terminology relating to titanium microstructures is presented in AS1814. 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: AMS4942F Size of tubing desired Quantity of tubing desired. PREPARED BY AMS COMMITTEE “G”
