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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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2006 SAE International All rights reserved. No part of this publication ma
3、y 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: 724-776-4970 (outside USA)
4、Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AMS 4942E AEROSPACE MATERIAL SPECIFICATION Issued JAN 1964 Revised JUN 2006 Superseding AMS 4942D Titanium Tubing, Seamless Annealed, 40.0 ksi (275 MPa) Yield Strength (Composition similar to UNS R50400) RATIONALE AMS
5、 4942E is 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 form of seamless tubing. 1.2 Application This tubing has been used typically for parts, such as fluid-conducting lines, requiring strength up to 4
6、00 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 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
7、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 Available from SAE International, 400 Comm
8、onwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), or www.sae.org AMS 2244 Tolerances, Titanium and Titanium Alloy Tubing AMS 2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS 2368 Sampling and Testing of Wrought Ti
9、tanium Raw Material Except Forgings and Forging Stock AMS 2809 Identification, Titanium Alloy Wrought Products AMS-H-81200 Heat Treatment of Titanium and Titanium Alloys SAE AMS 4942E - 2 - 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohock
10、en, PA 19428-2959, Tel: 610-832-9585, or www.astm.org ASTM E8 Tension Testing of Metallic Materials ASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique ASTM E 1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Ga
11、s Fusion Thermal Conductivity/Infrared Detection Method ASTM E 1941 Standard Test Method for Determination of Carbon in Refractory and Reactive Metals and Their Alloys ASTM E 2371 Standard Test Method for Analysis of Titanium and Titanium Alloys by Atomic Emission Plasma Spectrometry 3. TECHNICAL RE
12、QUIREMENTS 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 ASTM E 1409, and other elements in accordance with ASTM E 2371. Other ana
13、lytical 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 - - - - - - - remainder 0.30 0.25 0.10 0.03 0.015 0.10 0.30 (300 ppm) (150 ppm) 3.1.1 Det
14、ermination 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 requirements of AMS 2249. 3.2 Melting Practice Alloy shall be produced by elec
15、tron beam cold hearth or plasma arc cold hearth melting practice, or shall be multiple melted with the final melting cycle under vacuum. When multiple melted, the first melt shall be made using vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth
16、 melting practice. The subsequent melt or melts shall be made using vacuum arc remelting (VAR) practice with no alloy additions permitted. 3.2.1 The atmosphere for nonconsumable electrode melting shall be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercu
17、ry. 3.2.2 The electrode tip for nonconsumable electrode melting shall be water-cooled copper. -,-,- SAE AMS 4942E - 3 - 3.3 Condition Cold reduced, annealed in accordance with AMS-H-81200, and descaled. 3.4 Properties Tubing shall conform to the following requirements: 3.4.1 Tensile Properties Shall
18、 be as specified in Table 2, determined in accordance with ASTM E 8 with the rate of strain maintained at 0.003 to 0.007 inch/inch/minute (0.003 to 0.007 mm/mm/minute) through the yield strength and then increased so as to produce failure in approximately one additional minute. When a dispute occurs
19、 between purchaser and vendor over the yield strength values, a referee test shall be performed on a machine having a strain rate pacer, using a rate of 0.005 inch/inch/minute (0.005 mm/mm/minute) through the yield strength and a minimum crosshead speed of 0.10 inch (2.5 mm) per minute above the yie
20、ld strength. 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 to 15% of the nominal OD shall wi
21、thstand, 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 section of tube shall withstand, without
22、 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 the bend. 3.4.2.2 Tubing with nomina
23、l 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 or other visible defects, by bein
24、g 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. 3.4.4 Pressure Testing Tubing shall show no bulges, leaks, pin holes, cracks, or
25、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: PS D2d2 D2d2+ - - = where: P = Test pressure in ksi (MPa) S = 20.0 ksi (140 MPa) t
26、ensile stress D = Nominal OD d = Nominal ID -,-,- SAE AMS 4942E - 4 - 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 100X magnification or by other method
27、s 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 oxide, burrs, seams, tears, grooves
28、, 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 imperfections are removable within the tol
29、erances 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 AMS 2244; standard tolerances for diameter and wall thickness shall apply. 4. QUALITY ASSURANCE PROVISIONS 4.1
30、 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 ensure that the tubing conforms to spe
31、cified 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 heat or lot as applicable. 4.2.2 P
32、eriodic 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 AMS 2368 and the following: 4.3.1 For Acceptance Tests 4.3.1.1 Flattening Test
33、s 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. Cut edges of the specimen shall be smooth and free from b
34、urrs. 4.3.2 For Periodic Tests As agreed upon by purchaser and vendor. -,-,- SAE AMS 4942E - 5 - 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 smooth and free from burrs but no
35、t rounded. 4.4 Reports 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 technical require
36、ments. This report shall include the purchase order number, heat number, lot number, AMS 4942E, size, and quantity from each heat. 4.5 Resampling and Retesting Shall be in accordance with AMS 2368. 5. PREPARATION FOR DELIVERY 5.1 Identification Tubing shall be identified in accordance with AMS 2809.
37、 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 vendor shall
38、 mention 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. 8. NOTES 8.1 A change bar (l) located in the left
39、 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 specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technical revisions
40、. Change bars and (R) are not used in original publications, nor in specifications 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 ARP1917 and as follow
41、s: 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: AMS 4942E Size of tubing desired Quantity of tubing desired. PREPARED BY AMS COMMITTEE “G” -,-,-