1、Designation:B38718Standard Specification forMolybdenum and Molybdenum Alloy Bar,Rod,and Wire1This standard is issued under the fixed designation B387;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers unalloyed molybdenum andmolybdenum alloy bar,rod,and wire as follows:1.1.1 Molybdenum 360Unalloyed vacuum arc-cast mo-l
3、ybdenum.1.1.2 Molybdenum 361Unalloyed powder metallurgy mo-lybdenum.1.1.3 Molybdenum Alloy 363Vacuum arc-cast molybde-num0.5%titanium0.1%zirconium(TZM)alloy.1.1.4 Molybdenum Alloy 364Powder metallurgy molyb-denum0.5%titanium0.1%zirconium(TZM)alloy.1.1.5 Molybdenum365Unalloyedvacuumarc-castmolybdenum
4、,low carbon.1.1.6 MolybdenumAlloy366Vacuumarc-castmolybdenum,30%tungsten alloy.1.2 This specification covers wire no smaller than 0.020 in.(0.51 mm)in diameter or of equivalent cross-sectional area.Specification F289 covers diameters up to 0.020 in.(0.51 mm).1.3 The values stated in inch-pound units
5、 are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 The following precautionary caveat pertains only to thetest method portions of this specification:This standard doesnot pur
6、port to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety,health,and environ-mental practices and determine the applicability of regulatorylimitations prior to use.1.5 This international standard was
7、 developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Do
8、cuments2.1 ASTM Standards:2E8 Test Methods for Tension Testing of Metallic MaterialsMetric E0008_E0008ME29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE92 Test Methods for Vickers Hardness and Knoop Hard-ness of Metallic MaterialsE384 Test Method for
9、 Microindentation Hardness of Mate-rialsE1941 Test Method for Determination of Carbon in Refrac-tory and Reactive Metals and TheirAlloys by CombustionAnalysisF289 Specification for Molybdenum Wire and Rod forElectronic Applications3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1
10、 bar and rod,nany straight product with a round,rectangular,hexagonal,or octagonal solid cross section,4 in.(101.6 mm)in diameter or less,or of equivalent cross-sectionalarea.3.1.2 wire,nany product furnished in coils or on spools orreels.3.2 Lot Definition:3.2.1 for chemical composition,nthe produc
11、t of a singleblend of powder or a single vacuum melted ingot.3.2.2 for mechanical property measurement,nthe productmanufactured from ingots sintered from either a single powderlot in a single sintering run in the same furnace or a singleingot,processed through the same processing equipment in asingl
12、e uninterrupted run,using the same thermomechanicalprocess to reach the same final size.4.Ordering Information4.1 Orders for material under this specification shall includethe following information as applicable:1This specification is under the jurisdiction of ASTM Committee B10 onReactive and Refra
13、ctory Metals and Alloys and is the direct responsibility ofSubcommittee B10.04 on Molybdenum and Tungsten.Current edition approved July 1,2018.Published September 2018.Originallyapproved in 1962.Last previous edition approved in 2010 as B387 10.DOI:10.1520/B0387-18.2For referenced ASTM standards,vis
14、it the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Ba
15、rr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommenda
16、tions issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.1.1 Material number and temper designation(Section 1and Table 3),4.1.2 Product form(Section 3),4.1.3 Chemical requirements(Table 1 and Table 2),4.1.4 Metallurgical condition(Section 7),4.1.5 Mechanical requirements(Section 8),4.1.6 Thermal stability(Section 9),4.1.7 Tolerances(Section 10 and Section 11 and Table 4),4.1.8 Workmanship and quality level requirements(Section12),4.1.9 Disposition of rejected ma