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 2015 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/AMS4926N AEROSPACE MATERIAL SPECIFICATION AMS4926 REV. N Issued 1958-03 Revised 2
5、015-07 Superseding AMS4926M Titanium Alloy, Bars, Wire, and Rings 5Al - 2.5Sn Annealed, 110 ksi (758 MPa) Yield Strength (Composition similar to UNS R54520) RATIONALE AMS4926N results from a Five Year Review and update of this specification that includes the removal of sample size allowance for hydr
6、ogen of Table 1 (covered by ASTM E1447), requires agreement on mechanical property values for material outside specification ranges (3.5.1.1.4 and 8.6), the addition of AS6279 (3.8), adds AMS2368 (4.3 and 4.5) and revises the report paragraph (4.4). 1. SCOPE 1.1 Form This specification covers a tita
7、nium alloy in the form of bars, wire, flash welded rings 4.000 inches (101.60 mm) and under in nominal diameter or least distance between parallel sides and 16 square inches (103 cm2) and under in cross-sectional area, and stock of any size for flash welded rings. 1.2 Application These products have
8、 been used typically for parts requiring strength up to 800 F (427 C) and which may be welded during fabrication, 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
9、 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. 2.1 SAE
10、Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2241 Tolerances, Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bars and Wire AM
11、S2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys SAE INTERNATIONAL AMS4926N Page 2 of 7 AMS2368 Sampling and Testing of Wrought Titanium Raw Material Except Forgings and Forging Stock AMS2750 Pyrometry AMS2809 Identification, Titanium and Titanium Alloy Wrought Products AMS7498 Rin
12、gs, Flash Welded, Titanium and Titanium Alloys AS6279 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/E8M Tension Testing
13、 of Metallic Materials ASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique ASTM E1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal Conductivity/Infrared Detection Method ASTM E1941 Determinatio
14、n of Carbon in Refractory and Reactive Metals and Their Alloys by Combustion Analysis ASTM E2371 Analysis of Titanium and Titanium Alloys by Direct Current Plasma and Inductively Coupled Plasma Atomic Emission Spectrometry 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by
15、 weight shown in Table 1; carbon 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 E2371. Other analytical methods may be used if acceptable to the purchaser. Table
16、1 - Composition Element min max Aluminum Tin Iron Oxygen Carbon Nitrogen Hydrogen Yttrium (3.1.1) Other Elements, each (3.1.1) Other Elements, total (3.1.1) Titanium 4.00 2.00 - - - - - - - - remainder 6.00 3.00 0.50 0.20 0.08 0.05 0.020 0.005 0.10 0.40 (500 ppm) (200 ppm) ( 50 ppm) 3.1.1 Determinat
17、ion not required for routine acceptance. 3.1.2 Check Analysis Composition variations shall meet the requirements of AMS2249. SAE INTERNATIONAL AMS4926N Page 3 of 7 3.2 Melting Practice Alloy shall be multiple melted. The first melt shall be made by vacuum consumable electrode, nonconsumable electrod
18、e, electron beam cold hearth, or plasma arc cold hearth melting practice. The subsequent melt or melts shall be made under vacuum using vacuum arc remelting (VAR) practice. Alloy additions are not permitted in the final melt cycle. 3.2.1 The atmosphere for nonconsumable electrode melting shall be va
19、cuum 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 The product shall be supplied in the following condition: 3.3.1 Bars Hot finished with or without s
20、ubsequent cold reduction, annealed, and descaled. Bar shall be processed to the final thickness/diameter by metallurgical working operations prior to any straightening, dimensional sizing or surface finishing operations. Bar shall not be cut from plate. 3.3.2 Wire Cold drawn, annealed, and descaled.
21、 3.3.3 Flash Welded Rings Fabricated in accordance with AMS7498, annealed, and descaled. 3.3.4 Stock for Flash Welded Rings As ordered by the flash welded ring manufacturer. 3.4 Annealing Bars, wire, and flash welded rings shall be annealed by heating to a temperature within the range 1325 to 1550 F
22、 (718 to 843 C), holding at the selected temperature within 25 F (14 C) for 10 minutes to 4 hours depending on section thickness, and cooling as required. Pyrometry shall be in accordance with AMS2750. 3.5 Properties The product shall conform to the following requirements and shall also meet the req
23、uirements of 3.5.1.1, and 3.5.1.2 after being heated to any temperature up to 1250 F (677 C), held at heat for 20 minutes 3, cooled in air, and descaled. 3.5.1 Bars, Wire, and Flash Welded Rings Product 4.000 inches (101.60 mm) and under in nominal diameter or least distance between parallel sides a
24、nd 16 square inches (103 cm2) and under in cross-sectional area shall conform to the following requirements: 3.5.1.1 Tensile Properties Shall be as specified 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 maintaine
25、d within a tolerance of 0.002 inch/inch/minute (0.002 mm/mm/minute) through the 0.2% offset yield strain. SAE INTERNATIONAL AMS4926N Page 4 of 7 Table 2A - Minimum tensile properties, inch/pound units Nominal Diameter or Least Distance Between Parallel Sides Inches Tensile Strength ksi Yield Strengt
26、h at 0.2% Offset ksi Elongation in 2 Inches or 4D % Long. Elongation in 2 Inches or 4D % L.T. Elongation in 2 Inches or 4D % S.T. Reduction of Area % Long. Reduction of Area % L.T. Reduction of Area % S.T. Up to 2.000, incl Over 2.000 to 4.000, incl 115 115 110 110 10 10 10 8 - 8 25 20 20 15 - 10 Ta
27、ble 2B - Minimum tensile properties, SI units Nominal Diameter or Least Distance Between Parallel Sides Millimeters Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 50.8 mm or 4D % Long. Elongation in 50.8 mm or 4D % L.T. Elongation in 50.8 mm or 4D % S.T. Reduction of Area % Lon
28、g. Reduction of Area % L.T. Reduction of Area % S.T. Up to 50.80, incl Over 50.80 to 101.60, incl 793 793 758 758 10 10 10 8 - 8 25 20 20 15 - 10 NOTE: Long. = Longitudinal L.T. = Long-Transverse S.T. = Short-Transverse 3.5.1.1.1 Tensile and yield strength requirements apply in both longitudinal and
29、 transverse directions. Transverse tensile properties of Table 2 apply only to product that a test specimen not less than 2.50 inch (63.5 mm) in length can be obtained. Tests in the transverse direction are not required on product tested in the longitudinal direction 3.5.1.1.2 Longitudinal requireme
30、nts in Table 2 apply to wire, to specimens from bars taken with the axis approximately parallel to the grain flow, and to specimens taken in the circumferential direction from flash welded rings. 3.5.1.1.3 Yield strength and reduction of area requirements do not apply to wire under 0.125 inch (3.18
31、mm) in diameter or least distance between parallel sides. 3.5.1.1.4 Mechanical property requirements for product outside the size range covered by Table 2 shall be agreed upon between purchaser and producer. 3.5.1.2 Microstructure shall be that resulting from processing within the alpha phase field
32、and shall consist of equiaxed or elongated alpha. 3.5.1.3 Surface Contamination The product shall be free of any oxygen-rich layer (See 8.3), such as alpha case, or other surface contamination, determined by microscopic examination at 400X magnification or by other method acceptable to purchaser. 3.
33、5.1.3.1 When permitted by purchaser, flash welded rings to be machined all over may have an oxygen-rich layer provided such layer is removable within the machining allowance. 3.5.2 Stock for Flash Welded Rings When a sample of stock is annealed as in 3.4, specimens taken from the stock shall conform
34、 to the requirements of 3.5.1.1, 3.5.1.2, and 3.5.1.3. 3.6 Quality The 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. SAE INTERNATIONAL AMS4926N Page 5 of 7 3.7 Tolerance
35、s Bars and wire shall conform to all applicable requirements of AMS2241. 3.8 Production, distribution, and procurement of metal stock shall comply with AS6279. This requirement becomes effective September 1, 2016. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the
36、product shall supply all samples for producers test 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 requirements. 4.2 Classification of
37、 Tests 4.2.1 Acceptance Tests The following requirements are acceptance tests and shall be performed on each heat or lot as applicable: 4.2.1.1 Composition (3.1) of each heat and hydrogen content of each lot. 4.2.1.2 Tensile properties (3.5.1.1), microstructure (3.5.1.2), and surface contamination (
38、3.5.1.3) of each lot of bars, wire, and flash welded rings as received. 4.2.1.3 Tolerances (3.7) of each lot of bars and wire. 4.2.2 Periodic Tests The following requirements are periodic tests and shall be performed at a frequency selected by the producer unless frequency of testing is specified by
39、 purchaser. 4.2.2.1 Tensile properties (3.5.1.1) after reheating at 1250 F (677 C) for bars, wire, and flash welded rings. 4.2.2.2 Ability of stock for flash welded rings to develop required properties (3.5.2). 4.3 Sampling and Testing Shall be in accordance with AMS2368 and the following; a lot sha
40、ll be all product of the same nominal size from the same heat processed at the same time: 4.3.1 For Acceptance Tests 4.3.1.1 Composition One sample from each heat; for hydrogen determination, one sample from each lot obtained after thermal and chemical processing is completed. 4.3.1.2 Tensile Proper
41、ties One or more samples from bars, wire, and flash welded rings from each lot. 4.3.1.2.1 Specimens from flash welded rings shall be cut from parent metal not including the weld-heat-affected zone. 4.3.1.3 Microstructure and Surface Contamination One sample from each lot. SAE INTERNATIONAL AMS4926N
42、Page 6 of 7 4.3.2 For Periodic Tests As agreed upon by purchaser and producer. 4.4 Reports 4.4.1 The producer shall furnish with each shipment a report showing producer identity, country where the metal was melted (e.g., final melt in the case of metal processed by multiple melting operations) and t
43、he results of tests for composition of each heat and for the hydrogen content, tensile properties, microstructure, and surface contamination of each lot, and state that the product conforms to the other technical requirements. This report shall include the purchase order number, heat and lot number,
44、 AMS4926N, product form and size (and/or part number, if applicable), specific annealing treatment used, and quantity. The producer of stock for flash welded rings shall furnish with each shipment a report showing producer identity, country where the metal was melted (i.e., final melt in the case of
45、 metal processed by multiple melting operations) and the results of tests for composition of each heat and for the hydrogen content of each lot. 4.4.2 Report the nominal metallurgically worked cross sectional size and the cut size, if different (See 3.3.1). 4.4.3 When the bar, wire, or flash welded
46、ring size is outside the range covered by 1.1, the report shall contain a statement to that effect. 4.5 Resampling and Retesting In accordance with AMS2368. 5. PREPARATION FOR DELIVERY 5.1 Identification 5.1.1 Bars and Wire In accordance with AMS2809. 5.1.2 Flash Welded Rings and Stock for Flash Wel
47、ded Rings As agreed upon by purchaser and producer. 5.2 Packaging The 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 accep
48、tance and safe delivery. 6. ACKNOWLEDGMENT A 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
49、rejection. SAE INTERNATIONAL AMS4926N Page 7 of 7 8. NOTES 8.1 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, including technical revisions. Change bars and (R) are not
