SAE AMS 4940C-2017 Titanium Sheet Strip and Plate Commercially Pure Annealed 25 0 ksi (172 MPa) Yield Strength (UNS R50250).pdf

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/AMS4940C AEROSPACE MATERIAL SPECIFICATION AMS4940 REV. C Issued 2003-04 Revised 2017-07 Superse

5、ding AMS4940B Titanium Sheet, Strip, and Plate Commercially Pure Annealed, 25.0 ksi (172 MPa) Yield Strength (Composition similar to UNS R50250) RATIONALE AMS4940C results from a Five-Year Review and update of this specification that includes the removal of sample size allowance for hydrogen (covere

6、d by ASTM E1447), adds ASTM E2994 to analyses methods (3.1), adds continuous heat treatment (3.4.1), requires agreement on mechanical property values for material outside specification ranges (3.5.1.2), adds sampling wording on continuous heat treated product (3.5.3), adds AS6279 (3.8), revises repo

7、rting (4.4), and adds AMS2368 to resampling (4.5). 1. SCOPE 1.1 Form This specification covers one grade (Grade 1) of commercially-pure titanium in the form of sheet, strip, and plate up through a thickness of 1.000 inch (25.40 mm) inclusive. 1.2 Application This material has been used typically for

8、 parts requiring the properties of titanium and good formability but not high strength, but usage is not limited to such applications. 1.3 Classification Product melted to this specification shall be produced by one of the following melting methods: Type 1 - Multiple melted using vacuum consumable e

9、lectrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold heath melting practice with the final melting cycle under vacuum. Type 2 - Electron beam melted. Unless a specific type is ordered, either type of melting practice may be supplied. 2. APPLICABLE DOCUMENTS The issue of t

10、he 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 specified. When the referenced document has been cancelled and no sup

11、erseding document has been specified, the last published issue of that document shall apply. SAE INTERNATIONAL AMS4940C Page 2 of 7 2.1 SAE 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 (

12、outside USA), 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 AMS2368 Sampling and Testing of Wrought Titanium Raw Material, Except Forgings and

13、Forging Stock AMS2750 Pyrometry AMS2809 Identification, Titanium and Titanium Alloy Wrought Products ARP1917 Clarification of Terms Used in Aerospace Metals Specifications AS4194 Sheet and Strip Surface Finish Nomenclature AS6279 Production, Distribution, and Procurement of Metal Stock 2.2 ASTM Publ

14、ications 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 A480/A480M General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip ASTM E8/E8M Tension Testing of Metallic

15、 Materials ASTM E112 Determining Average Grain Size ASTM E290 Bend Testing of Material for Ductility ASTM E384 Microindentation Hardness of Materials ASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by Inert Gas Fusion ASTM E1447 Determination of Hydrogen in Titanium a

16、nd 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 Direct Current Plasma and Inductively Coupled

17、Plasma Atomic Emission Spectrometry ASTM E2994 Analysis of Titanium and Titanium Alloys by Spark Atomic Emission Spectrometry and Glow Discharge Atomic Emission Spectrometry SAE INTERNATIONAL AMS4940C Page 3 of 7 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentages by weight sh

18、own 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 or ASTM E2994. Other analytical methods may be used if acceptable to the purchaser. Ta

19、ble 1 - Composition Element Min Max Iron - 0.20 Oxygen - 0.15 Carbon - 0.08 Nitrogen - 0.03 (300 ppm) Hydrogen - 0.015 (150 ppm) Other Elements, each (3.1.1) - 0.10 Other Elements, total (3.1.1) - 0.30 Titanium remainder 3.1.1 Determination not required for routine acceptance. 3.1.2 Check Analysis C

20、omposition variations shall meet the applicable requirements of AMS2249. 3.2 Melting Practice Alloy shall be produced by electron beam cold hearth melting (Type 2) or shall be multiple melted (Type 1). When multiple melted, the first melt shall be made by vacuum consumable electrode, nonconsumable e

21、lectrode, electron beam cold hearth, or plasma arc cold hearth melting practice. 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 nonconsumable electrode melting shall be vacuum or shal

22、l 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 Sheet and Strip Hot rolled with or without subs

23、equent cold reduction, annealed, descaled, and leveled, having a surface appearance comparable to a commercial corrosion-resistant steel No. 2D finish (see 8.4). 3.3.2 Plate Hot rolled, annealed, descaled, and flattened, having a surface appearance comparable to a commercial corrosion-resistant stee

24、l No. 1 finish (see 8.4). Plate product shall be produced using standard industry practices 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. SAE INTERNATIONAL AMS4940C Page 4 of 7 3.4 Anneal

25、ing Except as specified in 3.4.1, product shall be annealed by heating to a temperature within the range 1200 to 1500 F (649 to 816 C), holding at the selected temperature within 25 F (14 C) for a time commensurate with the thickness and the heating equipment and procedure used, and cooling as requi

26、red to produce product capable of meeting requirements of 3.5 (see 8.3). Pyrometry shall be in accordance with AMS2750. 3.4.1 Continuous Heat Treating of Sheet and Strip Process parameters (e.g., furnace temperature set points, heat input, travel rate, etc.) for continuous heat treating lines shall

27、be established by the material producer and validated by testing of product to requirements of 3.5. 3.5 Properties The product shall conform to the following requirements: 3.5.1 Tensile Properties Shall be in accordance with Table 2 for product 1.000 inch (25.40 mm) and under in nominal thickness, d

28、etermined 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 the 0.2% offset yield strain. Table 2 - Tensile properties Property Value Tensile Strength, min

29、imum 35.0 ksi (241 MPa) Yield Strength at 0.2% Offset 25.0 to 45 ksi (172 to 310 MPa) Elongation in 2 Inches (50.8 mm) or 4D, minimum 24% 3.5.1.1 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 ou

30、tside the size range covered by 1.1 shall be agreed upon between purchaser and producer. 3.5.2 Bending Product under 0.1875 inch (4.762 mm) in nominal thickness, shall have a test sample prepared nominally 0.750 inch (19.06 mm) in width, with its axis of bending parallel to the direction of rolling.

31、 The sample shall be bend tested in conformance with the guided bend test defined in ASTM E290 through an angle of 105 degrees. The test fixture supports shall have a contact radius 0.010 minimum, and the plunger shall have a radius equal to the bend factor shown in Table 3 times the nominal thickne

32、ss. Examination of the bent sample shall show no evidence of cracking when examined at 15 to 25 X magnification. Table 3 - Bend factors Nominal Thickness Inch Nominal Thickness Millimeters Bend Factor Up to 0.070 Over 0.070 to 0.1875 Up to 1.78 Over 1.78 to 4.762 1.5 2 SAE INTERNATIONAL AMS4940C Pag

33、e 5 of 7 3.5.3 Average Grain Size Shall be No. 6 or finer, determined in accordance with ASTM E112. 3.5.4 Surface Contamination The product shall be free of any oxygen-rich layer, such as alpha case, or other surface contamination, determined as in 3.5.4.1, or 3.5.4.2, or 3.5.4.3, or by other method

34、 acceptable to purchaser. 3.5.4.1 The bend test of 3.5.2. 3.5.4.2 Examination of a metallographic cross section at 400X minimum. 3.5.4.3 Hardness differential; a surface hardness more than 40 points higher than the subsurface hardness, determined in accordance with ASTM E384 on the Knoop scale using

35、 a 200 gram load, is 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 8.5) of depth in excess of the flatness tolerances, ripples, and foreign materials and from imperfec

36、tions detrimental to usage of the product. 3.6.1 When specified, titanium plate 0.500 inch (12.7 mm) and over in thickness shall meet ultrasonic quality standards agreed upon by purchaser and producer (see 8.7). 3.7 Tolerances Shall conform to all applicable requirements of AMS2242. 3.8 Production,

37、distribution, and procurement of metal stock shall comply with AS6279. This requirement becomes effective December 1, 2018. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of the product shall supply all samples for producers tests and shall be responsible for the perf

38、ormance 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 Tests All technical requirements are acceptance tests and shall be performed on each hea

39、t or lot as applicable. 4.3 Sampling and Testing Shall be in accordance with AMS2368 and as follows: 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 th

40、at for hydrogen determinations one sample from each lot obtained after thermal and chemical processing is completed. SAE INTERNATIONAL AMS4940C Page 6 of 7 4.3.2 Tensile Property, Bending, Grain Size, and Surface Contamination Requirements For coil produced product, at least one sample shall be take

41、n from material representative of each end of the continuously processed coil. For multiple plate and individually rolled sheet product, at least one sample shall be taken from two master plates or sheets produced in the lot. For pack rolled sheet product, at least one sample shall be taken from mat

42、erial representative of each pack. 4.3.2.1 Specimens for tensile tests of widths 9 inches (229 mm) and over shall be taken with specimen axis in both the longitudinal and long-transverse directions; for widths under 9 inches (229 mm), specimens shall be taken with the specimen axis in the longitudin

43、al direction. 4.3.3 Ultrasonic Examination When specified (see 8.7), each plate shall be examined. 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 processed by multiple melti

44、ng operations), the results of tests for composition of each heat and for the hydrogen content, tensile and bending properties, and grain size of each lot, ultrasonic examination results (if applicable) of each plate, and stating that the product conforms to the other technical requirements. This re

45、port shall include the purchase order number, heat and lot numbers, AMS4940C, product form, type, mill produced size, specific annealing treatment used, and quantity. 4.4.2 When the product size is outside the range covered by 1.1, the report shall contain a statement to that effect. 4.5 Resampling

46、and Retesting Shall be in accordance with AMS2368. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with AMS2809. 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

47、 the handling, packaging, and transportation of the product to ensure carrier acceptance 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 t

48、his specification, or to modifications authorized by purchaser, will be subject to rejection. SAE INTERNATIONAL AMS4940C Page 7 of 7 8. NOTES 8.1 Revision Indicator A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editori

49、al 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 original publications, nor in documents that contain editorial changes only. 8.2 The mechanical properties defined in this specification were taken from MIL-T-9046 and have not been verified by AM