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 2013 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:/www.sae.org/technical/standards/AMS4902K AEROSPACE MATERIAL SPECIFICATION AMS4902 REV. K Issued 1955-08 Revised 2
5、013-08 Superseding AMS4902J Titanium Sheet, Strip, and Plate Commercially-Pure Annealed 40.0 ksi (276 MPa) Yield Strength (Composition similar to UNS R50400) RATIONALE AMS4902K is a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers one grade of commercial
6、ly-pure titanium in the form of sheet, strip, and plate up through 1.000 inch (25.40 mm). 1.2 Application This material typically has been used for parts requiring aqueous corrosion resistance, moderate strength up to 400 F (204 C) and oxidation resistance up to 600 F (316 C), but usage is not limit
7、ed 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 to a subsequent revision of a document unless a specific document issue is specif
8、ied. 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 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Cana
9、da) or 724-776-4970 (outside USA), or www.sae.org. AMS2242 Tolerances, Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Sheet, Strip, and Plate AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS2750 Pyrometry AMS2809 Identification, Titanium and Tita
10、nium Alloy Wrought Products SAE INTERNATIONAL AMS4902K Page 2 of 6 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19248-2959, Tel: 610-832-9585, or www.astm.org. ASTM E 8 / E 8M Tension Testing of Metallic Materials ASTM E 112 Det
11、ermining Average Grain Size ASTM E 290 Bend Testing Material for Ductility ASTM E 384 Knoop and Vickers Hardness of 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 Titan
12、ium 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 Titanium Alloys by Direct Current Plasma and Inductively Coupled Plasma Atomic Emission Spectr
13、ometry 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 ASTM E 1409, and other elements in accordance with
14、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 Other Elements, each (3.1.1) Other Elements, total (3.1.1) Titanium - - - - - - - remainder 0.30 0.20 0.08 0.05 0.0150 0.10 0.30 (500 ppm) (150
15、 ppm) 3.1.1 Determination not required for routine acceptance. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2249. 3.2 Melting Practice 3.2.1 Alloy shall be produced by electron beam cold hearth or plasma arc cold hearth melting method, or shall be multiple
16、 melted with the final melting cycle under vacuum. When multiple melted, the first melt shall be made using a vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice. The subsequent melt or melts shall be made under vacuum using vac
17、uum arc remelting (VAR) practice. Alloy additions are not permitted in the final melt cycle. SAE INTERNATIONAL AMS4902K Page 3 of 6 3.2.1.1 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 mercury. 3
18、.2.1.2 The electrode tip for nonconsumable electrode melting shall be water-cooled copper. 3.3 Condition The product shall be supplied in the following condition: 3.3.1 Sheet and Strip Hot rolled with or without subsequent cold reduction, annealed, descaled, and leveled, having a surface appearance
19、comparable to a commercial corrosion-resistant steel No. 2D finish (See 8.2). 3.3.2 Plate Hot rolled, annealed, descaled, and flattened, having a surface appearance comparable to a commercial corrosion-resistant steel No. 1 finish (See 8.2). Plate product shall be produced using standard industry pr
20、actices designed strictly for the production of plate stock to the procured thickness. Bar, billet, forgings, or forging stock shall not be supplied in lieu of plate. 3.4 Annealing The product shall be annealed by heating to a temperature within the range 1200 to 1500 F (649 to 816 C), holding at th
21、e selected temperature within 25 F (14 C) for a time commensurate with the thickness and the heating equipment and procedure used, and cooling at a rate that will produce product meeting the requirements of 3.5. Pyrometry shall be in accordance with AMS2750. 3.5 Properties The product shall conform
22、to the following requirements: 3.5.1 Tensile Properties Shall be as shown in Table 2 on product 1.000 inch (25.40 mm) and under in nominal thickness, 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 toler
23、ance of 0.002 inch/inch/minute (0.002 mm/mm/minute) through the 0.2% offset yield strain. TABLE 2 - TENSILE PROPERTIES Property Value Tensile Strength, minimum Yield Strength at 0.2% Offset Elongation in 2 Inches (50.8 mm) or 4D, minimum 50.0 ksi (345 MPa) 40.0 to 65.0 ksi (276 to 448 MPa) 20% 3.5.1
24、.1 Elongation requirement applies only to product 0.025 inch (0.64 mm) and over in nominal thickness. 3.5.1.2 Mechanical property requirements for product outside the range covered by 3.5.1 shall be agreed upon between purchaser and producer. 3.5.2 Bending Product under 0.1875 inch (4.763 mm) in nom
25、inal thickness shall withstand, without evidence of cracking when examined at 20X magnification, bending in accordance with ASTM E 290 through an angle of 105 degrees around a radius equal to the bend factor shown in Table 3 times the nominal thickness of the product with the axis of bend parallel t
26、o the direction of rolling. In case of dispute, results of bend tests using the end supported guided bend test procedure shall govern. SAE INTERNATIONAL AMS4902K Page 4 of 6 TABLE 3 - BEND FACTOR Nominal Thickness Inch Nominal Thickness Millimeters Bend Factor Up to 0.070, incl Over 0.070 to 0.1874,
27、 incl Up to 1.78, incl Over 1.78 to 4.76, incl 2 2.5 3.5.3 Grain Size Shall be 6 or finer, determined by comparison of a polished and etched specimen with the chart in ASTM E 112. 3.5.4 Surface Contamination The product shall be free of any oxygen-rich layer, such as alpha case, or other surface con
28、tamination, determined as in 3.5.4.1 or 3.5.4.2 or other method acceptable to purchaser. 3.5.4.1 The bend test of 3.5.2. 3.5.4.2 Hardness differential; a surface hardness more than 40 points higher than the subsurface hardness, determined in accordance with ASTM E 384 on the Knoop scale using a 200-
29、gram load, being evidence of unacceptable surface contamination. 3.6 Quality The product, as received by purchaser, shall be uniform in quality and condition, sound, and free from “oil cans“ (See 8.3.1) of depth in excess of the flatness tolerances, ripples, and foreign materials and from imperfecti
30、ons detrimental to usage of the product. 3.7 Tolerances Shall conform to all applicable requirements of AMS2242. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of the product shall supply all samples for vendors tests and shall be responsible for the performance of all
31、required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests All technical requirements are acceptance tests and shall be performed on each heat or lot as app
32、licable. 4.3 Sampling and Testing Shall be in accordance with the following; a lot shall be all product of the same nominal size from the same heat processed at the same time and annealed in the same heat treatment batch. 4.3.1 Composition One sample from each heat, except that for hydrogen determin
33、ations one sample from each lot obtained after thermal and chemical processing is completed. 4.3.2 Tensile Property, Bending, Grain Size, and Surface Contamination Requirements At least one sample from each lot. SAE INTERNATIONAL AMS4902K Page 5 of 6 4.3.2.1 Specimens for tensile tests from material
34、 of width 9 inches (228.6 mm) and over shall be taken with specimen axis in both the longitudinal and long-transverse directions; from material of width under 9 inches (228.6 mm), specimens shall be taken with the specimen axis in the longitudinal directions. 4.3.2.2 For guided bend tests, specimen
35、width shall be not less than 10 times the nominal thickness but not less than 1 inch (25 mm). For free bend tests, minimum specimen width shall, when possible, be not less than 10 times the nominal thickness; maximum width need not be greater than 1 inch (25 mm). 4.4 Reports 4.4.1 The producer shall
36、 furnish with each shipment a report showing the producer identity and country where the metal was melted (i.e., final melt in the case of metal processed by multiple melting operations) and the results of tests for composition of each heat and for the hydrogen content, tensile, and bending properti
37、es, and grain size of each lot, and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, lot number, AMS4902K, type, specific annealing treatment used, product form, size, and quantity. 4.4.2 When product size is outside the rang
38、e covered by 3.5.1, the report shall contain a statement to that effect. 4.5 Resampling and Retesting If any specimen used in the above tests fails to meet the specified requirements, disposition of the product may be based on the results of testing three additional specimens for each original nonco
39、nforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the product represented. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with AMS2809. 5.2 Packaging The product shall be
40、 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 product to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A vendor shall include this specification n
41、umber and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Product not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 A change bar (|) located in the left margin is for the convenien
42、ce 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, including technical revisions. Change bars and (R) are not used in
43、original publications, nor in documents that contain editorial changes only. 8.2 Commercial corrosion-resistant steel finishes are defined in ASTM A 480 / A 480M and AS4194. SAE INTERNATIONAL AMS4902K Page 6 of 6 8.3 Terms used in AMS are clarified in ARP1917 and as follows: 8.3.1 “Oil Can“ An exces
44、s of material in a localized area of a sheet that causes the sheet to buckle in that area. When the sheet is placed on a flat surface and hand pressure applied to the buckle, the buckle will spring through to the opposite surface or spring up in another area of the sheet. 8.4 Dimensions and properti
45、es 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: AMS4902K Type of melting practice, if desired (See 3.2.1) Product form and size of product desired Quantity of product desired Property and acceptance requirements from the cognizant engineering organization applicable to sizes outside the range of 3.5.1. PREPARED BY AMS COMMITTEE “G“
