ASTM_A_753_-_08_2013.pdf

Designation:A75308(Reapproved 2013)Standard Specification forWrought Nickel-Iron Soft Magnetic Alloys(UNS K94490,K94840,N14076,N14080)1This standard is issued under the fixed designation A753;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers commonly used wroughtnickel-iron soft magnetic alloys produced or supplied expresslyfor use in magnetic cores and other parts requiring highmagnetic permeability,high electrical resistivity,low coercivefield strength,and low core loss.1.2 This specification covers materials supplied by a pro-ducer or converter to the form and physical condition desiredfor fabrication into parts that will later be given a final heattreatment to achieve the desired magnetic characteristics.Itcovers materials supplied in the form of forging billet;hot-rolled plate,strip,and bar;cold-finished bar;cold-rolled andannealed sheet and strip;shaped bar and wire;and wire.1.2.1 This specification does not cover either powder met-allurgically produced or cast parts.1.2.2 This specification lists requirements for strip productshaving isotropic or semi-isotropic magnetic properties but doesnot include requirements for anisotropic or square hysteresisloop alloys or alloys processed to yield flattened hysteresisloops by use of heat treatments in an applied magnetic field.1.2.3 This specification does not cover alloys modified bythe addition of elements such as sulfur and selenium to enhancemachinability.1.3 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.2.Referenced Documents2.1 ASTM Standards:2A34/A34M Practice for Sampling and Procurement Testingof Magnetic MaterialsA340 Terminology of Symbols and Definitions Relating toMagnetic TestingA341/A341M Test Method for Direct Current MagneticProperties of Materials Using D-C Permeameters and theBallistic Test MethodsA480/A480M Specification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet,and StripA484/A484M Specification for General Requirements forStainless Steel Bars,Billets,and ForgingsA555/A555M Specification for General Requirements forStainless Steel Wire and Wire RodsA596/A596M Test Method for Direct-Current MagneticProperties of Materials Using the Ballistic Method andRing SpecimensA772/A772M Test Method forAC Magnetic Permeability ofMaterials Using Sinusoidal CurrentA773/A773M Test Method for dc Magnetic Properties ofMaterials Using Ring and Permeameter Procedures withdc Electronic HysteresigraphsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)E1019 Test Methods for Determination of Carbon,Sulfur,Nitrogen,and Oxygen in Steel,Iron,Nickel,and CobaltAlloys by Various Combustion and Fusion Techniques3.Terminology3.1 The terms and symbols used in this specification aredefined in Terminology A340.4.Classification4.1 Four specific alloy types are covered in Table 1.4.2 Alloy Type 2 in thin-strip form(thickness less than orequal to 0.020 in.(0.51 mm)is available in two differentgrades.Grade 1 is semi-isotropic and is recommended for usein transformer laminations.Grade 2 is isotropic and is recom-mended for use in rotating machinery laminations and mag-netic shielding parts.These grades are the result of differentmill processing(that is,cold-rolling and annealing)practicesand cannot be created by changes in the final heat treatmentgiven to the laminations or parts.1This specification is under the jurisdiction of ASTM Committee A06 onMagnetic Properties,and is the direct responsibility of Subcommittee A06.02 onMaterial Specifications.Current edition approved May 1,2013.Published July 2013.Originally approvedin 1978.Last previous edition approved in 2008 as A75308.DOI:10.1520/A0753-08R13.2For 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.Ordering Information5.1 Orders for material conforming to this specificationshall include the following information:5.1.1 Reference to this specification and year of issue orrevision.5.1.2 Alloy type(Section 4)and grade where appropriate.5.1.3 Dimensions and tolerances(Section 12).5.1.4 Quantity(weight or number of pieces as appropriate).5.1.5 Form and condition(Section 7).5.1.6 Magnetic property requirements if they are other thanthose listed in this specification.5.1.7 Certification of chemical analysis and magnetic qual-ity evalu