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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 2008 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 4958C AEROSPACE MATERIAL SPECIFICATION Issued 1988-04 Revised 2008-01 Superseding AMS 4958B Titanium Alloy Bars and Rods 3Al - 8V - 6Cr - 4Mo - 4Zr Consumable Electrode Melted Solution Heat Treated and Centerless
5、Ground (Composition similar to UNS R58640) RATIONALE AMS 4958C results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification covers a titanium alloy in the form of bars and rods 1.00 inch (25.4 mm) and under in nominal diameter. 1.2 Application These products
6、 have been used typically for coil springs requiring low solid height, high tensile strength, and corrosion resistance, 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 specifi
7、cation 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 document has been specified, the last published issue of that document shall apply. 2.
8、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 AMS 2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys AMS 2368 Sampling and Testing of Wrought
9、Titanium Raw Material Except Forgings and Forging Stock AMS 2750 Pyrometry AMS 2809 Identification, Titanium and Titanium Alloy Wrought Products SAE AMS 4958C - 2 - 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 6
10、10-832-9585, www.astm.org ASTM E 8 Tension Testing of Metallic Materials ASTM E 112 Determining Average Grain Size ASTM E 1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique ASTM E 1417 Liquid Penetrant Testing ASTM E 1447 Determination of Hydr
11、ogen 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 Titanium Alloys by Atomic Emission Plasma Spectrometry 2.3 ASME Publ
12、ications Available from American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org ASME B46.1 Surface Texture (Surface Roughness, Waviness and Lay) 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weig
13、ht 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 analytical methods may be used if acceptable to the purchaser. TABLE 1
14、 - COMPOSITION Element min max Aluminum Vanadium Chromium Molybdenum Zirconium Iron Oxygen Carbon Nitrogen Hydrogen (3.1.2) Yttrium (3.1.1) Other Elements, each (3.1.1) Other Elements, total (3.1.1) Titanium 3.00 7.50 5.50 3.50 3.50 - - - - - - - - remainder 4.00 8.50 6.50 4.50 4.50 0.30 0.12 0.05 0
15、.03 0.030 0.005 0.15 0.40 (300 ppm) ( 50 ppm) 3.1.1 Determination not required for routine acceptance. 3.1.2 Sample size when using ASTM E 1447 for hydrogen determination may be as large as 0.35 gram. 3.1.3 Check Analysis Composition variations shall meet the applicable requirements of AMS 2249. SAE
16、 AMS 4958C - 3 - 3.2 Melting Practice 3.2.1 Alloy shall be multiple melted. Melting cycles prior to final melting shall be made using vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice. The final melting cycle shall be made und
17、er vacuum using vacuum arc (VAR) electrode practice with no alloying additions permitted. 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. 3.2.1.2 The electrode tip for nonconsumable
18、 electrode melting shall be water-cooled copper. 3.3 Condition Hot rolled, solution heat treated, and centerless ground. The product shall be centerless ground to size after solution heat treatment followed by cleaning and an acid pickle with not less than 0.0005 inch (12.7 m) overall stock removal.
19、 The solution heat treated product may be cold worked, not exceeding 5% total reduction, for sizing purposes prior to centerless grinding and acid pickling. It shall have a surface texture not greater than 63 RMS, determined in accordance with ASME B46.1. 3.4 Heat Treatment Product shall be solution
20、 heat treated by heating to a temperature within the range 1450 to 1600 F (788 to 871 C), holding at the selected temperature within 25 F (14 C) for sufficient time for solution heat treatment, and cooling at a rate equivalent to an air cool or faster. Pyrometry shall be in accordance with AMS 2750.
21、 3.5 Properties Product shall conform to the following requirements: 3.5.1 As Solution Heat Treated 3.5.1.1 Coiling Product shall show a uniform pitch when wound 2 coils minimum on an arbor having less than or equal to the diameter specified in Table 2. All surfaces of the coil test shall be visuall
22、y inspected at 8-12X magnification for the existence of cracks and seams. The test piece shall be extended as required to allow inspection of the coils. TABLE 2A COILING REQUIREMENTS, INCH/POUND UNITS Wire Diameter, Inches Mandrel Diameter, Inches Up to 0.125, incl 0.250 Over 0.125 to 0.187, incl 0.
23、375 Over 0.187 to 0.250, incl 0.500 Over 0.250 to 0.312, incl 0.625 Over 0.312 to 0.375, incl 0.750 Over 0.375 to 0.435, incl 0.875 Over 0.435 to 0.500, incl 1.000 Over 0.500 to 0.560, incl 1.125 Over 0.560 to 0.625, incl 1.250 Over 0.625 to 0.690, incl 1.375 Over 0.690 to 0.750, incl 1.500 Over 0.7
24、50 to 0.815, incl 1.625 Over 0.815 to 0.875, incl 1.750 Over 0.875 to 0.940, incl 1.875 Over 0.940 to 1.000, incl 2.000 SAE AMS 4958C - 4 - TABLE 2B COILING REQUIREMENTS, SI UNITS Wire Diameter, Millimeters Mandrel Diameter, Millimeters Up to 3.18, incl 6.35 Over 3.18 to 4.75, incl 9.53 Over 4.75 to
25、 6.35, incl 12.70 Over 6.35 to 7.92, incl 15.88 Over 7.92 to 9.53, incl 19.05 Over 9.53 to 11.05, incl 22.23 Over 11.05 to 12.70, incl 25.40 Over 12.70 to 14.22, incl 28.58 Over 14.22 to 15.88, incl 31.75 Over 15.88 to 17.53, incl 34.93 Over 17.53 to 19.05, incl 38.10 Over 19.05 to 20.70, incl 41.28
26、 Over 20.70 to 22.23, incl 44.45 Over 22.23 to 23.88, incl 47.63 Over 23.88 to 25.40, incl 50.80 3.5.1.2 Average Grain Size Shall be as follows, determined in accordance with ASTM E 112: 3.5.1.2.1 Product 0.625 Inch (15.88 mm) and Under in Nominal Diameter ASTM 5 or finer. 3.5.1.2.2 Product Over 0.6
27、25 to 1.00 Inch (15.88 to 25.4 mm), Inclusive in Nominal Diameter ASTM 3 or finer. 3.5.2 After Aging Product shall have the following properties after being aged by heating to a temperature within the range 850 to 1050 F (454 to 566 C), holding at the selected temperature within 10 F (6 C) for 6 to
28、30 hours, and cooling in air. 3.5.2.1 Tensile Properties Shall be as shown in Table 3, determined in accordance with ASTM E 8: TABLE 3 - MINIMUM TENSILE PROPERTIES Property Value Tensile Strength 180 ksi (1241 MPa) Elongation in 4D 8% Reduction of Area 20% 3.6 Quality Product, as received by purchas
29、er, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the product. 3.6.1 Product shall have a smooth finish free from pits and abrasions, shall be cylindrical, clean, even uniform cast, and free from kinks, twists, scrape
30、s, splits, and other imperfections. 3.6.2 Bars and rods shall be nondestructively inspected by fluorescent penetrant inspection in accordance with ASTM E 1417 or by electromagnetic (eddy current) inspection. Cracks and other surface defects are not acceptable. SAE AMS 4958C - 5 - 3.7 Tolerances Shal
31、l conform to 3.7.1 and 3.7.2. 3.7.1 Diameter Shall be as shown in Table 4. TABLE 4A - TOLERANCES, INCH-POUND UNITS Nominal Diameter Inch Tolerance, Inch Plus and Minus Up to 0.032, incl 0.0005 Over 0.032 to 0.042, incl 0.00075 Over 0.042 to 0.312, incl 0.001 Over 0.312 to 1.000, incl 0.0015 TABLE 4B
32、 - TOLERANCES, SI UNITS Nominal Diameter Millimeters Tolerance, Millimeter Plus and Minus Up to 0.81, incl 0.013 Over 0.81 to 1.07, incl 0.019 Over 1.07 to 7.92, incl 0.025 Over 7.92 to 25.40, incl 0.038 3.7.2 Length Tolerance Straight lengths shall vary not more than +2.0 inches (+51 mm), -0 inches
33、 (-0 mm). 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 required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed n
34、ecessary to ensure that the product conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1) average grain size (3.5.1.2), tensile properties after ageing (3.5.2.1) fluorescent penetrant inspection (3.6.2) and tolerances (3.7) are acceptance tests and
35、shall be performed on each heat or lot as applicable. 4.2.2 Periodic Tests Coil tests (3.5.1.1) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by the purchaser. 4.3 Sampling and Testing Shall be in accordance with AMS 2368 and
36、 the following: 4.3.1 Tensile Properties Two samples from each lot. SAE AMS 4958C - 6 - 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 melt
37、ed (i.e., final melt in the case of metal processed by multiple melting operations). The vendor of the product shall furnish with each shipment a report showing the results of tests for composition of each heat and for the hydrogen content, grain size, and tensile properties after aging of each lot
38、and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, AMS 4958C, heat and lot numbers, product form, size, quantity, and aging time and temperature used to obtain reported tensile properties. 4.5 Resampling and Retesting Shall
39、 be in accordance with AMS 2368. 5. PREPARATION FOR DELIVERY 5.1 Packaging and Identification Product shall be supplied in coils or in straight lengths, as ordered. 5.2 The product shall be identified in accordance with AMS 2809 as applicable to bars and rods. 5.3 Product shall be prepared for shipm
40、ent 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 mention this specification number and its revis
41、ion 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 convenience of the user in l
42、ocating 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. Change bars and (R) are not used in original
43、publications, nor in specifications that 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
44、approximate equivalents of the primary units and are presented only for information. 8.4 Purchase documents should specify not less than the following: AMS 4958C Product form and size of product desired Quantity of product desired Method of nondestructive inspection and acceptance standards (See 3.6.2). PREPARED BY AMS COMMITTEE “G“