ASTM_F_364_-_96_2014.pdf

Designation:F36496(Reapproved 2014)Standard Specification forMolybdenum Flattened Wire for Electron Tubes1This standard is issued under the fixed designation F364;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers two types of molybdenumflattened wire up to 0.050 in.(1.27 mm)thick and up to 0.375in.(9.52 mm)wide,specifically for use in electron tubes.Thetwo grades have UNS numbers R03604 and R03603.1.2 The values stated in inch-pound units 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.1.3 The following safety hazards caveat pertains only to thetest method described in this specification(see 10.2).Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:2E18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE315 Test Methods for Chemical Analysis of Molybdenum(Withdrawn 2010)3E384 Test Method for Knoop and Vickers Hardness ofMaterials3.Classification3.1 Two types of molybdenum flattened wire are covered bythis specification:3.1.1 Type I,UNS R03604This type shall have the com-position limits prescribed in Table 1.3.1.2 Type II,UNS R03603This type shall be a high-recrystallization-temperature material having the compositionlimits prescribed in Table 1 and shall be capable of retaining itsductility after firing at a temperature of 2375 6 25F(1300 614C)for at least 20 min.4.Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity of each size,4.1.2 Dimensions or size(see 8.1),4.1.3 Edgewise curvature(camber)if required(see 8.2),4.1.4 Type(see 3.1),4.1.5 Temper(see 7.1),and4.1.6 How furnished(coils,spools,etc.).5.Materials and Manufacture5.1 The molybdenum wires covered by this specificationshall be made by any appropriate process.NOTE1It has been found that molybdenum wire made by the powdermetallurgy process will meet the requirements of this specification.6.Chemical Composition6.1 Type I and Type II molybdenum wire shall conform tothe chemical compositions prescribed in Table 1.6.2 The materials shall be analyzed in accordance with TestMethods E315 or other appropriate ASTM methods whenavailable.Other methods,as mutually agreed upon betweenseller and purchaser,may be employed.7.Physical Properties7.1 TemperMaterial under this specification shall be sup-plied in one of the following classifications of temper:7.1.1 HardAs-rolled,not stress-relieved,suitable forspring applications,or7.1.2 Stress-Relieved Suitable for bending or winding.7.2 The hardness test(see 10.1)is to be used as the criterionfor identifying hard and stress-relieved materials in accordancewith Table 2.7.2.1 When determining microhardness using light loads,the thickness and load relationships shown in Table 3 arerecommended for best correlation and reproducibility.1This specification is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee F01.03 on MetallicMaterials.Current edition approved June 1,2014.Published July 2014.Originally approvedin 1973.Last previous edition approved in 2009 as F364 96(2009).DOI:10.1520/F0364-96R14.2For referenced ASTM standards,visit 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.3 Bend and Delamination(Type I and Type II Wire inStress-Relieved Temper)In the as-received condition(nofiring),this wire shall show no evidence of cracking,splitting,delamination,or splintering when subjected to the bend anddelamination test(see 10.2).7.4 Bend and Delamination(Type II Wire in Hard andStress-Relieved Tempers)After firing Type II material at atemperature of 2375 6 25F(1300 6 14C)for at least 20 min,it shall show no evidence of cracking,splitting,delamination,or splintering when subjected to the bend and delamination test(see 10.2).NOTE2Type II material will show little or no evidence of recrystal-lization after firing as prescribed in 7.4.This may be determined bymicrostructural comparison of a fired and an unfired specimen,displayinga longitudinal section,from the same spool or coil of material.8.Dimensions