1、_6$(7HFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRUWLVSXEOLVKH GE6$(WRDGYDQFHWKHVWDWHRIWHFKQLFDODQGHQJL neering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising tKHUHIURPLVWKHVROHUHVSRQVLE
2、LOLWRIWKHXVHUSAE 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 InternationalAll rights reserved. No part of this publication may be reproduced, stored
3、 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: +1 724-776-4970 (outside USA)Fax: 724-776-0790Email:
4、 CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on thisTechnical Report, please visithttp:/standards.sae.org/AMS7855DAEROSPACEMATERIAL SPECIFICATIONAMS7855REV. DIssued 1966-03Revised 2008-06Reaffirmed 2017-01Superseding AMS7855CColumbium (Niobium)
5、Alloy Bars, Rods, and Wire10W - 2.5ZrRecrystallized(Composition similar to UNS R04271)RATIONALEAMS7855D has been reaffirmed to comply with the SAE five-year review policy.1. SCOPE1.1 This specification covers a columbium alloy in the form of bars, rods, or wire.1.2 ApplicationThis material has been
6、used typically for parts requiring exposure at ultra-high temperatures, but usage is not limited to such applications. Applications in oxidizing atmospheres necessitate a protective coating.2. APPLICABLE DOCUMENTSThe issue of the following documents in effect on the date of the purchase order forms
7、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 superseding document has been specified, the last published issue of that do
8、cument shall apply.2.1 SAE PublicationsAvailable 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.AMS2809 Identification, Titanium and Titanium Alloy Wrought Products2.2 ASTM PublicationsAv
9、ailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,Tel: 610-832-9585, www.astm.org.ASTM E 8 / E 8M Tension Testing of Metallic MaterialsASTM E 21 Elevated Temperature Tension Testing of Metallic MaterialsASTM E 384 Knoop and Vickers Hardness of Me
10、tallic MaterialsASTM E 2626 Spectrometric Analysis of Reactive and Refractory Metals2.3 ANSI PublicationsAvailable from American National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org.ANSI B46.1 Surface Texture (Surface Roughness, Waviness, and La
11、y)3. TECHNICAL REQUIREMENTS3.1 CompositionThe product shall conform to the percentages by weight shown in Table 1. Metallic elements shall be determined by spectrochemical methods in accordance with ASTM E 2626, carbon shall be determined by the combustion method using an infrared detection system;
12、oxygen, nitrogen and hydrogen shall be determined by the inert gas fusion technique , or by other methods acceptable to purchaser:TABLE 1 COMPOSITIONElement min maxTungsten 9.0 11.0Zirconium 2.0 3.0Tantalum - 0.15Carbon - 0.030Silicon - 0.02Iron - 0.02Titanium - 0.01Oxygen - 0.020 (200 ppm)Nitrogen
13、- 0.010 (100 ppm)Hydrogen - 0.001 ( 10 ppm)Columbium (Niobium) remainder3.2 ConditionHot-cold worked, descaled, and recrystallized or, if specified, hot-cold worked, descaled, recrystallized, and centerless ground.3.2.1 The surface finish of centerless ground bars shall be 90 microinches or smoother
14、, determined in accordance with ANSI B46.1.3.3 Heat TreatmentProduct shall be recrystallized at a temperature between 2200 and 2400 F (1204 and 1316 C) under vacuum (less than 0.1 micron (0.1 m) of mercury) or inert atmosphere or as agreed upon by purchaser and vendor.3.4 PropertiesThe product shall
15、 conform to the following requirements: 3.4.1 Tensile PropertiesShall be in accordance with 3.4.1.1 and 3.4.1.2.SAE INTERNATIONAL AMS7855D 2 OF 63.4.1.1 At Room TemperatureRound bars, rods, and wires 0.050 to 0.500 inch (1.27 to 12.7 mm), inclusive, in diameter shall conform to the requirements show
16、n in Table 2 determined in accordance with ASTM E 8 / E 8M using 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 and 0.05 inch/inch/minute (0.05 mm/mm/minute) and maintaine
17、d within a tolerance of 0.02 inch/inch/minute (0.02 mm/mm/minute above the yield strain to fracture. TABLE 2 - MINIMUM TENSILE PROPERTIESProperty ValueTensile Strength 75 ksi (517 MPa)Yield Strength at 0.2% Offset 60 ksi (414 MPa)Elongation in 1 Inch (25.4 mm) 20%Reduction of Area 30%3.4.1.2 At 2200
18、 F (1204 C)Round bars, rods, and wire 0.050 to 0.500 inch, (1.27 to 12.70 mm), inclusive, in nominal diameter shall meet the requirements of Table 3 when heated to 2200 F 10 (1204 C 6) in vacuum under 0.1 micron of mercury or an inert atmosphere, held at heat for 15 minutes before testing, and teste
19、d in accordance with ASTM E 21 at 2200 F 10 (1204 C 6) at a strain rate of set at 0.05 inch/inch/minute (0.05 mm/mm/minute) and maintained within a tolerance of 0.02 inch/inch/minute (0.02 mm/mm/minute) . TABLE 3 - MINIMUM TENSILE PROPERTIES AT 2200 F (1204 C)Property ValueTensile Strength 25.0 ksi
20、(172 MPa)Yield Strength at 0.2% Offset 20.0 ksi (138 MPa)Elongation in 1 Inch (25.4 mm) 20%3.4.2 HardnessShall be not higher than 225 HV30, or equivalent, determined in accordance with ASTM E 3843.4.3 MicrostructureProduct recrystallized as in 3.3 shall show a structure consisting essentially of rec
21、rystallized grains; additional standardsfor acceptance shall be as agreed upon by purchaser and vendor (See 8.4).3.5 QualityThe 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 prod
22、uct.3.6 TolerancesShall conform to the following:3.6.1 Hot-Cold Worked and Descaled3.6.1.1 Round Rod and WireShall be as specified in Table 4.SAE INTERNATIONAL AMS7855D 3 OF 6TABLE 4A - DIAMETER TOLERANCES, ROUND ROD AND WIRE, INCH/POUND UNITSNominal DiameterInchesTolerance, InchPlusTolerance, InchM
23、inusOut of Round,Inch0.016 to 0.030, incl 0.0005 0.0005 -Over 0.030 to 0.062, incl 0.001 0.001 -Over 0.062 to 0.281, incl 0.002 0.002 0.004Over 0.281 to 0.422, incl 0.010 0.005 0.008Over 0.422 to 0.625, incl 0.010 0.005 0.012Over 0.625 to 0.875, incl 0.015 0.005 0.015Over 0.875 to 1.000, incl 0.020
24、0.005 0.015Over 1.000 to 1.375, incl 0.020 0.010 0.018Over 1.375 to 1.500, incl 0.020 0.015 0.020Over 1.500 to 1.625, incl 0.025 0.015 0.020Over 1.625 to 2.000, incl 0.030 0.020 0.025Over 2.000 to 2.500, incl 0.032 0.032 0.025Over 2.500 to 3.250, incl 0.032 0.032 0.027Over 3.250 to 3.500, incl 0.045
25、 0.045 0.040TABLE 4B - DIAMETER TOLERANCES, ROUND ROD AND WIRE, SI UNITSNominal DiameterMillimetersTolerance, mmPlusTolerance, mmMinusOut of Round,Millimeters0.41 to 0.76, incl 0.013 0.013 -Over 0.76 to 1.57, incl 0.03 0.03 -Over 1.57 to 7.14, incl 0.05 0.05 0.10Over 7.14 to 10.72, incl 0.25 0.13 0.
26、20Over 10.72 to 15.88, incl 0.25 0.13 0.30Over 15.88 to 22.22, incl 0.38 0.13 0.38Over 22.22 to 25.40, incl 0.51 0.13 0.38Over 25.40 to 34.92, incl 0.51 0.25 0.46Over 34.92 to 38.10, incl 0.51 0.38 0.51Over 38.10 to 41.28, incl 0.64 0.38 0.51Over 41.28 to 50.80, incl 0.76 0.51 0.64Over 50.80 to 63.5
27、0, incl 0.81 0.81 0.64Over 63.50 to 82.55, incl 0.81 0.81 0.69Over 82.55 to 88.90, incl 1.14 1.14 1.023.6.1.2 Square and Rectangular BarShall be as specified in Table 5.TABLE 5A - TOLERANCES, SQUARE AND RECTANGULAR BAR, INCH/POUND UNITSNominal Thickness (T)InchesThickness Tolerance, InchPlus and Min
28、usWidth Tolerance, InchPlusWidth Tolerance, InchMinus0.187 to 0.500, incl 0.10T 10% 0Over 0.500 0.062 10% 0TABLE 5B - TOLERANCES, SQUARE AND RECTANGULAR BAR, SI UNITSNominal ThicknessMillimetersThickness Tolerance, mmPlus and MinusWidth Tolerance, mmPlusWidth Tolerance, mmMinus4.75 to 12.70, incl 0.
29、10T 10% 0Over 12.70 1.57 10% 0SAE INTERNATIONAL AMS7855D 4 OF 63.6.1.3 Centerless GroundShall be as specified in Table 6.TABLE 6A - TOLERANCES, CENTERLESS GROUND, INCH/POUND UNITSNominal Diameter,InchesTolerance, InchPlusTolerance, InchMinus0.188 to 0.250, incl 0.002 0.002Over 0.250 to 0.500, incl 0
30、.004 0.004Over 0.500 to 1.000, incl 0.005 0.005Over 1.000 0.010 0TABLE 6B - TOLERANCES, CENTERLESS GROUND, SI UNITSNominal Diameter,MillimetersTolerance, mmPlusTolerance, mmMinus4.78 to 6.35, incl 0.05 0.05Over 6.35 to 12.70, incl 0.10 0.10Over 12.70 to 25.40, incl 0.13 0.13Over 25.40 0.25 0.04. QUA
31、LITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe 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 necessary to ensure
32、 that the product conforms to the requirements of this specification.4.2 Classification of Tests4.2.1 Acceptance TestsComposition (3.1), room temperature tensile properties (3.4.1.1), hardness (3.4.2) microstructure (3.4.3) and tolerances (3.6) are acceptance tests and shall be performed on each hea
33、t or lot as applicable.4.2.2 Periodic TestsElevated temperature tensile properties (3.4.1.2) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser.4.3 Sampling and TestingShall be in accordance with the following; a lot
34、shall be all product of the same nominal size, from the same heat, processed at the same time.4.3.1 CompositionOne sample from each heat, except that for carbon, oxygen, nitrogen, and hydrogen determinations one sample from eachlot.4.3.2 Tensile Properties, Hardness, and MicrostructureTwo samples fr
35、om each lot.SAE INTERNATIONAL AMS7855D 5 OF 64.4 ReportsThe vendor of the product shall furnish with each shipment a report showing the results of tests for composition of each heat, and for tensile properties at room temperature, hardness, and microstructure of each lot, and stating that the produc
36、t conforms to the other technical requirements. This report shall include the purchase order number, heat and lot numbers, AMS7855D, product form, size, and quantity.4.5 Resampling and RetestingIf any specimen used in the above tests fails to meet the specified requirements, disposition of the produ
37、ct may be based on the results of testing two additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet the specified requirements shall be cause for rejection of the product represented and no additional testing shall be permitted. Results of all tests sh
38、all be reported.5. PREPARATION FOR DELIVERY5.1 IdentificationShall be in accordance with AMS2809.5.2 PackagingThe 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 transport
39、ation of the product to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENTA vendor shall include this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONSProduct not conforming to this specification, or to modifications author
40、ized by purchaser, will be subject to rejection.8. NOTES8.1 A change bar (|) 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 docum
41、ent title indicates a complete revision of the document, including technical revision. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.8.2 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimens
42、ions 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. 8.3 Terms used in AMS are clarified in ARP1917.8.4 Purchase documents should specify not less than the following:AMS7855DProduct form and size or part number of product desiredQuantity of product desiredStandards for acceptance for microstructure (See 3.4.3).PREPARED BY AMS COMMITTEE “G“SAE INTERNATIONAL AMS7855D 6 OF 6
