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 2017 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:/standards.sae.org/AMS4958E AEROSPACE MATERIAL SPECIFICATION AMS4958 REV. E Issued 1988-04 Revised 2017-12 Superse
5、ding AMS4958D Titanium Alloy Bars and Rods 3Al - 8V - 6Cr - 4Mo - 4Zr Consumable Electrode Melted Solution Heat Treated and Centerless Ground or Peeled and Polished (Composition similar to UNS R58640) RATIONALE AMS4958E results from a Five-Year Review and update of this specification that adds ASTM
6、E539 and ASTM E2994 (3.1), removal of sample size allowance for hydrogen of Table 1 (covered by ASTM E1447), adds testing of material outside limits (3.5.2.1.1), addition of AMS6279 (3.8) and AMS2368 for Sampling and Resampling (4.3 and 4.5) and revises reporting (4.4) and marking (5.1). 1. SCOPE 1.
7、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 have been used typically for coil springs requiring low solid height, high tensile strength, and corrosion resistance, but usage is not lim
8、ited 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 spec
9、ified. 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 Ca
10、nada) or +1 724-776-4970 (outside USA), www.sae.org. 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 Prod
11、ucts SAE INTERNATIONAL AMS4958E Page 2 of 6 AS6279 Standard Practice for Production, Distribution, and Procurement of Metal Stock 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/
12、E8M Tension Testing of Metallic Materials ASTM E112 Determining Average Grain Size ASTM E539 Analysis of Titanium Alloys by X-Ray Fluorescence Spectrometry ASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by Inert Gas Fusion ASTM E1417 Liquid Penetrant Testing ASTM E14
13、47 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection Method ASTM E1941 Determination of Carbon in Refractory and Reactive Metals and Their Alloys by Combustion Analysis ASTM E2371 Analysis of Titanium and Titanium Alloys by Dire
14、ct Current Plasma and Inductively Coupled Plasma Atomic Emission Spectrometry ASTM E2994 Analysis of Titanium and Titanium Alloys by Spark Atomic Emission Spectrometry and Glow Discharge Atomic Emission Spectrometry 2.3 ASME Publications Available from ASME, P.O. Box 2900, 22 Law Drive, Fairfield, N
15、J 07007-2900, Tel: 800-843-2763 (U.S./Canada), 001-800-843-2763 (Mexico), 973-882-1170 (outside North America), 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 weight shown in Table 1; carbon
16、 shall be determined in accordance with ASTM E1941, hydrogen in accordance with ASTM E1447, oxygen and nitrogen in accordance with ASTM E1409, and other elements in accordance with ASTM E539, ASTM E2371 or ASTM E2994. Other analytical methods may be used if acceptable to the purchaser. SAE INTERNATI
17、ONAL AMS4958E Page 3 of 6 Table 1 - Composition Element Min Max Aluminum Vanadium Chromium Molybdenum Zirconium Iron Oxygen Carbon Nitrogen Hydrogen 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
18、.50 4.50 0.30 0.12 0.05 0.03 0.030 0.005 0.15 0.40 (300 ppm) ( 50 ppm) 3.1.1 Determination not required for routine acceptance. 3.1.2 Check Analysis Composition variations shall meet the applicable requirements of AMS2249. 3.2 Melting Practice Alloy shall be multiple melted. The first melt shall be
19、made by vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice. The subsequent melt or melts shall be made using vacuum arc remelting (VAR) practice. Alloy additions are not permitted in the final VAR melt. 3.2.1 The atmosphere for
20、 nonconsumable electrode melting shall be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury. 3.2.2 The electrode tip for nonconsumable electrode melting shall be water-cooled copper. 3.3 Condition Hot rolled, solution heat treated and centerless ground
21、 or peeled and polished to size with surface removal sufficient to remove all surface defects and alpha case. In addition, acid pickle with not less than 0.0005 inch (12.7 m) overall stock removal may be used. The solution heat treated product may be cold worked, not exceeding 5% total reduction, fo
22、r sizing purposes prior to centerless grinding or peeling and polishing and surface removal. It shall have a surface texture not greater than Ra 63, determined in accordance with ASME B46.1. Bar shall not be cut from plate. 3.4 Heat Treatment Product shall be solution heat treated by heating to a te
23、mperature 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 AMS2750. SAE INTERNATIONAL AMS4958E Page
24、4 of 6 3.5 Properties Product shall conform to the following requirements: 3.5.1 As Solution Heat Treated 3.5.1.1 Average Grain Size Shall be as follows, determined in accordance with ASTM E112: 3.5.1.1.1 Product 0.625 Inch (15.88 mm) and Under in Nominal Diameter ASTM 5 or finer. 3.5.1.1.2 Product
25、Over 0.625 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) f
26、or 6 to 30 hours, and cooling in air. 3.5.2.1 Tensile Properties Shall be as shown in Table 2, determined in accordance with ASTM E8/E8M 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/minute) through
27、 the 0.2% offset yield strain. Table 2 - Minimum tensile properties Property Value Tensile Strength 180 ksi (1241 MPa) Elongation in 4D 8% Reduction of Area 20% 3.5.2.1.1 Mechanical property requirements for product outside of the range covered by 1.1 shall be agreed upon between purchaser and produ
28、cer. 3.6 Quality Product, as received by purchaser, 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 u
29、niform cast, and free from kinks, twists, scrapes, splits, and other imperfections. 3.6.2 Bars and rods shall be nondestructively inspected by fluorescent penetrant inspection in accordance with ASTM E1417 or by electromagnetic (eddy current) inspection (see 8.4). Cracks, seams and other surface def
30、ects are not acceptable. 3.7 Tolerances Shall conform to 3.7.1 and 3.7.2. 3.7.1 Diameter Shall be as shown in Table 4. SAE INTERNATIONAL AMS4958E Page 5 of 6 Table 3 Table 3A - Tolerances, inch-pound units Nominal Diameter Inches Tolerance, Inch Plus and Minus Up to 0.032, incl 0.0005 Over 0.032 to
31、0.042, incl 0.00075 Over 0.042 to 0.312, incl 0.001 Over 0.312 to 1.000, incl 0.0015 Table 3B - 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
32、.2 Length Tolerance Straight lengths shall vary not more than +2.0 inches (+51 mm), -0 inches (-0 mm). 3.8 Production, distribution, and procurement of metal stock shall comply with AS6279. This requirement becomes effective June 1, 2019. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspec
33、tion The producer of the product 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 necessary to ensure that the product conforms to specified requireme
34、nts. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1) average grain size (3.5.1.1), tensile properties after ageing (3.5.2.1), fluorescent penetrant inspection (3.6.2) and tolerances (3.7) are acceptance tests and shall be performed on each heat or lot as applicable. 4.3 Sampling
35、 and Testing Shall be in accordance with AMS2368 and the following: 4.3.1 Tensile Properties Two samples from each lot. 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report showing producer identity, country where the metal was melted (i.e., final melt in the case of metal proces
36、sed by multiple melting operations), results of tests for composition of each heat, as solution heat treated grain size, tensile properties after aging of each lot and stating that the product conforms to the other technical requirements. This report shall include the purchase order number, AMS4958E
37、, heat and lot numbers, product form, size, quantity, and aging time and temperature used to obtain reported tensile properties. SAE INTERNATIONAL AMS4958E Page 6 of 6 4.4.2 When material produced to this specification is beyond the sizes allowed in the scope or tables, or other exceptions are taken
38、 to the technical requirements listed in Section 3, (see 5.2) the report shall contain a statement “This material is certified as AMS4958E(EXC) because of the following exceptions:“ and the specific exceptions shall be listed. 4.5 Resampling and Retesting Shall be in accordance with AMS2368. 5. PREP
39、ARATION 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 AMS2809 as applicable to bars and rods. When technical exceptions are taken (see 4.4.2), the material shall be identifie
40、d with AMS4958E(EXC). 5.3 Product 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 product to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A
41、 producer shall include this specification number 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 Revision Indicator A
42、 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, incl
43、uding technical revisions. Change bars and (R) are not used in original publications, nor in documents 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 pr
44、operties 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: AMS4958E Product form and size of product desired Quantity of product desired Method of nondestructive inspection and acceptance standards (see 3.6.2) Property and acceptance requirements from the cognizant engineering organization applicable to sizes outside the size range listed in 1.1 PREPARED BY AMS COMMITTEE “G“
