ASTM_F_31_-_12.pdf

Designation:F3112Standard Specification forNickel-Chromium-Iron Sealing Alloys1This standard is issued under the fixed designation F31;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 iron-nickel-chromium al-loys(UNS K94760 and UNS K95150)used primarily forglass-sealing applications in electronic devices.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 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:2E18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE38 Methods for Chemical Analysis of Nickel-Chromiumand Nickel-Chromium-Iron Alloys(Withdrawn 1989)3E112 Test Methods for Determining Average Grain SizeE228 Test Method for Linear Thermal Expansion of SolidMaterials With a Push-Rod DilatometerF14 Practice for Making and Testing Reference Glass-MetalBead-SealF140 Practice for Making Reference Glass-Metal Butt Sealsand Testing for Expansion Characteristics by PolarimetricMethodsF144 Practice for Making Reference Glass-Metal SandwichSeal and Testing for Expansion Characteristics by Polari-metric Methods3.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Size,3.1.2 Temper(Section 6),3.1.3 Surface finish(Section 8),3.1.4 Marking and packaging(Section 13),and3.1.5 Certification if required.4.Chemical Composition4.1 The material shall conform to the requirements of Table1 as to chemical composition.NOTE1The major constituents of this alloy may be adjusted by themanufacturer so that the alloy meets the requirement for thermal expan-sion.5.Chemical Analysis5.1 Chemical analysis shall be made,when desired,inaccordance with Methods E38.6.Surface Lubricants6.1 All lubricants used during cold-working operations suchas drawing,rolling,or spinning,shall be capable of beingremoved readily by any of the common organic degreasingsolvents.7.Temper7.1 The desired temper of the material shall be specified onthe purchase order.Unless otherwise specified,wire,rod,andtubing shall be given a final bright anneal by the manufacturer.Strip and sheet shall be annealed properly to develop drawingproperties.For deep drawing,the hardness shall not exceedRockwell B90 when determined in accordance with TestMethods E18.8.Grain Size8.1 Strip and sheet for deep drawing applications shall havean average grain size not larger than ASTM No.5(Note 2),with no more than 10%of the grains larger than No.5 whenmeasured in accordance with Test Methods E112.For materials1This specification is under the jurisdiction of ASTM Committee F01 onElectronics and is the direct responsibility of Subcommittee F01.03 on MetallicMaterials.Current edition approved July 1,2012.Published August 2012.Originallyapproved in 1963 as F31 63 T.Last previous edition approved in 2010 asF31 05(2010).DOI:10.1520/F0031-12.2For 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 less than 0.005 in.(0.13 mm)in thickness,the grain size shallbe such that there are no less than 4 grains across the thickness.NOTE2This corresponds to a grain size finer than 0.065 mm or 16grains/in.2of image at 100.9.Dimensional Tolerances9.1 Cold-Rolled StripCold-rolled strip shall conform tothe permissible variations in dimensions prescribed in Table 2,Table 3,and Table 4.9.2 Round Wire and RodWire and rod shall conform to thepermissible variations in dimension prescribed in Table 5.9.3 Cold-Drawn TubingCold-drawn tubing,available ei-ther as seamless or welded,shall conform to the permissiblevariations prescribed in Table 6.10.Surface Finish10.1 The standard surface finishes available shall be thoseresulting from the following operations:10.1.1 Hot rolling,10.1.2 Forging,10.1.3 Centerless grinding(rod),10.1.4 Belt polishing,10.1.5 Cold rolling,and drawing,and10.1.6 Wire drawing.10.2 Care shall be taken to prevent the depletion of surfacechromium during processing.11