ASTM_F_85_-_76_2013.pdf

Designation:F8576(Reapproved 2013)Standard Practice forNomenclature for Wire Leads Used as Conductors inElectron Tubes1This standard is issued under the fixed designation F85;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 practice covers rules for designating one,two,orthree-piece round wire leads used as conductors through glassseals in electron tubes.Stranded leads and leads for semicon-ductors are excluded.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety 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:2B127 Specification for Nickel-Copper Alloy(UNS N04400)Plate,Sheet,and StripB160 Specification for Nickel Rod and BarF15 Specification for Iron-Nickel-Cobalt Sealing AlloyF29 Specification for Dumet Wire for Glass-to-Metal SealApplicationsF30 Specification for Iron-Nickel Sealing AlloysF290 Specification for Round Wire for Winding ElectronTube Grid Laterals3.Dimensioning3.1 DiameterThe diameter shall be expressed in millime-tres.Three digits shall be used for all diameters under 1 mmand four or more digits shall be used for all diameters 1 mmand larger.A decimal point is understood to be present threeplaces from the right.3.2 LengthThe length shall be expressed in millimetresusing any number of digits.NOTE1All fractions shall be expressed in millimetres as decimals.3.3 Conventions The diameter shall always precede andbe separated from the length by the letter“x”.For example,awire 13 mm long and 0.508 mm in diameter will be referred toas 508x13.4.Nomenclature4.1 The nomenclature for designating a lead shall consist ofone,two,or three parts;for one-,two-,or three-piece leads,respectively.Each of these parts shall specify for its piece thediameter in millimetres,the length in millimetres,and thematerial(see Section 4).The order for designating the compo-nent pieces shall be:(1)the inner lead section,(2)the press ofseal section,and(3)the outer lead section.4.1.1 Each portion of the designation shall be separated bya dash(),for example,508x13FeCuC40406x2D1016x8NiPtd,corresponding to Inner LeadPress LeadOuter Lead,respectively.4.1.2 One-,two-,or three-piece leads shall be designatedaccording to the typical examples listed in Table 1.5.Materials5.1 The material for a component lead section is generallydesignated by use of its chemical symbol.Anumerical suffix atthe end of the material designation preceded by“C”(coating)indicates percent of cladding or plating.For unspecified alloys,a numerical value between chemical symbols indicates thepercent content of the material preceding the value.5.2 Additional descriptive suffixes are given in Table 2.5.3 Materials List Commonly used lead wire materialsand their respective designations are listed in Table 3.Wheretrade names are indicated,equivalent materials may be used.5.4 Annealing TreatmentsFor special applications it issometimes desirable to have the entire lead,or certain parts,with an extremely soft temper.To satisfy these conditions,standard treatments are available as follows:5.4.1 Anneal Types:1This practice is under the jurisdiction of ASTM Committee F01 on Electronicsand is the direct responsibility of Subcommittee F01.03 on Metallic Materials.Current edition approved May 1,2013.Published May 2013.Originallyapproved in 1967.Last previous edition approved in 2009 as F85-76(2009).DOI:10.1520/F0085-76R13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.4.1.1 Entire Lead Anneal(No.1)Entire leads involvingnickel and copper are annealed at a temperature suitable forannealing copper but below the annealing point for nickel.After annealing,the leads are put through a straighteningprocess to recondition any leads which become distortedduring the anneal.5.4.1.2 Entire Lead Anneal(No.1A)This is the sameprocess as No.1 anneal except the final straightening operationis omitted.5.4.1.3 Hook Anneal(No.2)This process anneals only thehook on finished leads.5.4.1.4 Outer Lead Anneal(No.3)The outer and pressleads are annealed as a unit before welding to the inner lead.This applies only to handmade leads.5.4.1.5 Inner Lead Anneal(No.4)The inner lead is givena special anneal before welding to