1、Designation:F 4 66(Reapproved 1999)Standard Specification forCarbonized Nickel Strip and Carbonized Nickel-Plated andNickel-Clad Steel Strip for Electron Tubes1This standard is issued under the fixed designation F 4;the number immediately following the designation indicates the year of originaladopt
2、ion or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers carbonized nickel strip andcarbonized nickel-plated and
3、 nickel-clad steel strip for use inelectron tubes.1.2 The values stated in inch-pound units are to be regardedas the standard.The metric equivalents of inch-pound unitsmay be approximate.2.Referenced Documents2.1 ASTM Standards:F 1 Specification for Nickel-Clad and Nickel-Plated SteelStrip for Elect
4、ron Tubes2F 3 Specification for Nickel Strip for Electron Tubes2F 155 Test Method for Temper of Strip and Sheet Metals forElectronic Devices(Spring-Back Method)33.Temper3.1 The temper of the strip shall conform to limits agreedupon by the producer and the consumer,and shall be deter-mined in accorda
5、nce with Test Method F 155.4.Dimensions,Mass and Permissible Variations4.1 ThicknessThe thickness of the material shall conformto the following tolerances:Thickness,in.(mm)Thickness,Tolerance,in.(mm)Under 0.010(0.25)60.0005(0.013)0.010 to 0.020(0.25 to 0.5),incl60.0008(0.020)The thickness shall be m
6、easured 0.375 in.(9.5 mm)from theedge on 1-in.(25.4-mm)or wider strip,or at any point onnarrower strip.4.2 WidthFor strip less than 3.0 in.(76 mm)wide and lessthan 0.020 in.(0.51 mm)thick,the width tolerance shall be60.005 in.(0.13 mm).4.3 Edgewise Bow shall be a maximum of 0.5 in.(13 mm)in 8 ft(2.4
7、 m).4.4 EdgeThe edge shall be such as would result from astandard slitting operation.4.5 BurrThe burr shall not exceed one half the stripthickness or 0.0025 in.(0.064 mm)whichever is smaller,asmeasured in accordance with the procedure described in theAppendix of Specification F 1.5.Workmanship,Finis
8、h,and Appearance5.1 The surface shall be free of any lubricant used inprocessing.The appearance of the carbonized strip shall beuniform.5.2 Other appearance characteristics shall be defined asagreed upon by the producer and the consumer.6.Test for Carbon Loss6.1 Testing for carbon loss by firing of
9、carbonized materialscovered by this specification shall be conducted in such amanner as to ensure an acceptable standard of quality foroperation in electron-tube applications.6.2 The materials being tested shall be protected by the useof a suitable covered boat,so as to prevent direct radiationfrom
10、the furnace heating elements or direct impingement ofgas.6.3 The cooling section of the furnace shall contain thesame atmosphere as that in the hot zone.6.4 The furnace atmosphere shall consist of pure hydrogenor 25%nitrogen and 75%hydrogen,and shall have a moisturecontent no greater than saturation
11、 at 45C.The maximumoxygen content of the furnace atmosphere shall be 0.001%byvolume.6.5 The firing temperature shall be 850 6 10C.The firingtime shall be 9 6 1 min at temperature for carbonized nickel,for both classes of carbonized nickel-clad steel,and forcarbonized nickel-plated steel,Type II;and
12、4 6 1 min forcarbonized nickel-plated steel,Type I.6.6 Samples after firing shall show no visual loss of carbonand shall be free from uncarbonized bare metal exposure.7.Coiling and Spooling7.1 Each coil or spool shall have only one continuous lengthof strip,free from joints of any kind,unless otherw
13、ise agreed.7.2 The strip shall be so coiled that the normal curvature isnot reversed.8.Chemical Requirements8.1 The base metal to be carbonized shall conform to1This specification is under the jurisdiction of ASTM Committee F-1 onElectronics and is the direct responsibility of Subcommittee F01.03 on
14、 MetallicMaterials.Current edition approved Sept.20,1966.Originally published 1957.ReplacesF4 62 T.Last previous edition F 4 66(1983)e1.2Annual Book of ASTM Standards,Vol 10.04.3Discontinued 1985,see 1983 Annual Book of ASTM Standards,Vol 10.04.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken
15、,PA 19428-2959,United States.Specification F 1,in which Type I and Type II nickel claddingand nickel plating are described,or Specification F 3.9.Rejection9.1 Any spools or coils not conforming to the specifiedrequirements may be rejected.If 15%of the spools or coils inany shipment do not conform to
16、 the specified requirements,theentire shipment may be rejected.10.Packaging10.1 The packing shall be adequate to protect the spools orcoils from contamination and damage during shipment.If aprotective coating is used,it shall be completely removable bytrichloroethylene degreasing.11.Package Marking11.1 Each coil or spool shall be marked plainly as follows:11.1.1 Name of material,11.1.2 Name of manufacturer,11.1.3 Lot or manufacturers identification number,11.1.4 Gross,tare,and net weight,11.1.5
