ASTM_F_3_-_02a.pdf

Designation:F 3 02aStandard Specification forNickel Strip for Electron Tubes1This standard is issued under the fixed designation F 3;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers nickel strip for use as cathodesor other elements in electron 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:B 162 Specification for Nickel Plate,Sheet,and Strip2E 39 Test Methods for Chemical Analysis of Nickel3E 107 Test Methods for Chemical Analysis of ElectronicNickel4E 129 Test Method for Spectrographic Analysis of Thermi-onic Nickel Alloys by the Powder Technique4F 1 Specification for Nickel-Clad and Nickel-Plated SteelStrip for Electron Tubes5F 16 Test Methods for Measuring Diameter or Thickness ofWire and Ribbon for Electronic Devices and Lamps5F 155 Test Method for Temper of Strip and Sheet Metals forElectronic Devices(Spring-Back Method)6F 239 Specification for Nickel Alloy Cathode Sleeves forElectron Devices73.Physical Requirements3.1 TemperThe temper shall conform to limits agreedupon by the producer and consumer when determined inaccordance with Test Method F 155.3.2 FinishThe surface shall be as smooth and free ofoxide,pits,scratches,seams,slivers,streaks,stains,scale,blisters,edge cracks,trimming burrs,and other defects orcontaminants,as best commercial practice will permit whenexamined under 103 magnification.4.Dimensions,Mass and Permissible Variations4.1 Strip up to and including 0.020 in.(0.51 mm)is coveredby this specification.4.2 Strip over 0.020 in.(0.51 mm)is covered by Specifica-tion B 162.4.3 ThicknessThe thickness shall conform to the toler-ances of Table 1.4.4 WidthThe width,as slit,shall conform to the toler-ances of Table 2.4.5 Edgewise BowThe edgewise bow shall be no morethan 0.5 in(13 mm)in 8 ft(2.4 m).4.6 EdgeThe edge shall be such as would result from astandard slitting operation.4.7 BurrThe burr shall not exceed one half the stripthickness or 0.0025 in.(0.064 mm),whichever is smaller.5.Chemical Requirements5.1 The chemical composition of nickel strip used forcathodes shall be as prescribed in Specification F 239.Forapproved test methods,see 7.5.5.2 Nickel strip used for elements other than cathodes shallconform to the requirements of Table 3 as to chemicalcomposition,or as specified in Specification F 239,if desired.5.3 The choice of grade for specific applications shall beagreed upon between the producer and consumer.6.Sampling6.1 Unwind required sample strip from each coil selectedfor inspection in such a manner that bending,twisting,and anyother distortion is prevented.6.2 If coil construction will permit,it is recommended thatsamples from coils of material be taken from both ends.7.Test Methods7.1 ThicknessOn material 0.004 in.(0.10 mm)and underin thickness,make six measurements at least 1 m apart inaccordance with Test Methods F 16 or with any equivalentmethod directly readable and accurate to 60.5%of stripthickness.On 1-in.(25-mm)or wider strip,or at any point onnarrower strip,make all measurements about 0.4 in.(10 mm)from the edge.NOTE1An alternative method of determining strip thickness byweighing is suggested in Appendix X1.1This specification is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee F01.03 on MetallicMaterials.Current edition approved Dec.10,2002.Published February 2003.Originallyapproved in 1957.Last previous edition approved in 2002 as F 3 00.2Annual Book of ASTM Standards,Vol 02.04.3Discontinued;see 1994 Annual Book of ASTM Standards,Vol 03.05.4Annual Book of ASTM Standards,Vol 03.05.5Annual Book of ASTM Standards,Vol 10.04.6Discontinued 1985,see 1983 Annual Book of ASTM Standards,Vol 10.04.7Discontinued 1992,see 1991 Annual Book of ASTM Standards,Vol 10.04.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.7.2 WidthDetermine width by removing a length of ap-proximately 5 in.(130 mm)and forming it into a loop bybringing the ends together and measuring directly acrossbottom of loop with a screw micrometer.7.3 Edgewise BowWith material laid out on a flat surface,place an 8-ft(2.4-m)straightedge against one edge of thematerial.Measure any deviation from straightness at themaximum distance of the material from the straightedge bymeans of a scale graduated in116in.or 1 mm and read to thenearest scale division.7.4 BurrMeasure burr in accordance with the Appendixof Specification F 1.7.5 Chemical AnalysisAnalyze in accordance with thefollowing ASTM methods.Test Methods E 39(wet method),E 107(photometric method),or E 129.8.Coiling and Spooling8.1 Each coil