1、Designation:F28996(Reapproved 2014)Standard Specification forMolybdenum Wire and Rod for Electronic Applications1This standard is issued under the fixed designation F289;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of las
2、t 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 grades of molybdenumwire less than 0.050 in.(1.27 mm)in diameter and one gradeof molybdenum rod 1.
3、00 in.(25.4 mm)or less in diameter asfollows:1.1.1 Grade 1Commercially pure molybdenum wire suit-able for leads,hooks,supports,heaters,and metal-to-glassseals.1.1.2 Grade 2Commercially pure molybdenum wire suit-able for mandrel either black or cleaned.1.1.3 Grade 3Commercially pure molybdenum rod su
4、it-able for leads,hooks,supports,and metal-to-glass seals.1.2 The term wire applies to all spooled or coiled materialand 0.050 in.(1.3 mm)or less in diameter and to short cutlengths 0.020 in.(0.51 mm)or less in diameter.1.3 The term rod applies to all material over 0.020 in.(0.51mm)in diameter,suppl
5、ied in straight lengths.1.4 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.1.5 This standard does not purport to address all of thesafety
6、 concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D374 Test Methods for Thickness of Sol
7、id Electrical Insu-lation(Withdrawn 2013)3E8 Test Methods for Tension Testing of Metallic MaterialsE315 Test Methods for Chemical Analysis of Molybdenum(Withdrawn 2010)3F16 Test Methods for Measuring Diameter or Thickness ofWire and Ribbon for Electronic Devices and LampsF205 Test Method for Measuri
8、ng Diameter of Fine Wire byWeighingF219 Test Methods of Testing Fine Round and Flat Wire forElectron Devices and Lamps2.2 Federal Standard:Fed.Std.No.123 Marking for Shipment(Civil Agencies)42.3 Military Standard:MIL-STD-129 Marking for Shipment and Storage(MilitaryAgencies)43.Chemical Composition3.
9、1 All grades of wire and rod shall be 99.90%minimumpure molybdenum.The maximum allowable oxygen contentshall be 0.007 weight%,while the maximum carbon contentshall be 0.03 weight%.4.Mechanical Properties4.1 Tensile Properties:4.1.1 The tension test specimens and procedures shall con-form to Methods
10、F219 for wire diameter up to and including0.010 in.(0.25 mm),and Test Methods E8 for all other wireand rod diameters.4.1.2 The tensile requirements of wire in sizes up to andincluding 0.020 in.(0.51 mm)in diameter shall conform to therequirements of Table 1 and shall be calculated by dividing thebre
11、aking load in grams-force by the size of the wire expressedin milligrams per 200 mm.4.1.3 The tensile requirements of wire in sizes over 0.020 in.(0.51 mm)up to 0.050 in.(1.3 mm)in diameter shall conformto the requirements of Table 2.4.1.4 The tensile requirements of rod shall be as agreedupon betwe
12、en the purchaser and the supplier.4.2 Ductility Properties:4.2.1 Wire up to 0.003 in.(0.08 mm)in diameter shall notbreak when subjected to the test prescribed in 11.4.1.1This specification is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee
13、F01.03 on MetallicMaterials.Current edition approved June 1,2014.Published July 2014.Originally approvedin 1954.Last previous edition approved in 2009 as F289 96(2009).DOI:10.1520/F0289-96R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at servic
14、eastm.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.4Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Phil
15、adelphia,PA 19111-5094,Attn:NPODS.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2.2 Wire over 0.003 in.(0.08 mm)up to 0.020 in.(0.51mm)in diameter shall not break or show cracks underobservation through a binocular microscope at 30 wh
16、ensubjected to the test prescribed in 11.4.2.4.2.3 Wire over 0.020 in.(0.51 mm)in diameter shall notbreak or show cracks under unaided visual observation whensubjected to the test prescribed in 11.4.3.4.2.4 Rod shall have ductility properties as agreed uponbetween the purchaser and the supplier.5.Surface Finish5.1 Molybdenum wire shall be furnished in the followingfinishes:5.1.1 As drawn,black,or5.1.2 As drawn,cleaned.5.2 Molybdenum rod shall be furnished in the followingfinishes:5.2.1 Black,5.2
