ASTM_A_341_-_A_341M_-_16.pdf

Designation:A341/A341M16Standard Test Method forDirect Current Magnetic Properties of Soft MagneticMaterials Using D-C Permeameters and the Point by Point(Ballistic)Test Methods1This standard is issued under the fixed designation A341/A341M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method provides dc permeameter tests for thebasic magnetic properties of soft magnetic materials in theform of bars,rods,wire,or strip specimens which may be cut,machined,or ground from cast,compacted,sintered,forged,extruded,rolled,or other fabricated materials.It includes testsfor determination of the normal induction under symmetricallycyclically magnetized(SCM)conditions and the hysteresisloop(B-H loop)taken under conditions of rapidly changing orsteep wavefront reversals of the direct current magnetic fieldstrength.This method has been historically referred to as theballistic test method.For testing hard or permanent magnetmaterials,Test Method A977/A977M shall be used.1.2 This test method shall be used in conjunction withPractice A34/A34M.1.3 This test method covers a range of magnetic fieldstrength in the specimen from about 0.05 Oe 4 A/m up toabove 5000 Oe 400 kA/m through the use of severalpermeameters.The separate permeameters cover this testregion in several overlapping ranges.1.4 Normal induction and hysteresis properties may bedetermined over the magnetic flux density range from essen-tially zero to the saturation induction for most materials.1.5 Recommendations of the useful magnetic field strengthrange for each of the permeameters are shown in Table 1.2Permeameters particularly well suited for general testing ofsoft magnetic materials are shown in boldface.Also,seeSections 3 and 4 for general limitations relative to the use ofpermeameters.1.6 The symbols and abbreviated definitions used in this testmethod appear with Fig.1 and in appropriate sections of thisdocument.For the official definitions,see Terminology A340.Note that the term magnetic flux density used in this documentis synonymous with the term magnetic induction.1.7 WarningMercury has been designated by EPA andmany state agencies as a hazardous material that can causecentral nervous system,kidney,and liver damage.Mercury,orits vapor,may be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercury andmercury-containing products.See the applicable product Ma-terial Safety Data Sheet(MSDS)for details and EPAs website(http:/www.epa.gov/mercury/faq.htm)for additional informa-tion.Users should be aware that selling mercury or mercury-containing products,or both,in your state may be prohibited bystate law.1.8 The values and equations stated in customary(cgs-emuand inch-pound)or SI units are to be regarded separately asstandard.Within this standard,SI units are shown in bracketsexcept for the sections concerning calculations where there areseparate sections for the respective unit systems.The valuesstated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combin-ing values from the two systems may result in nonconformancewith this standard.1.9 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:3A34/A34M Practice for Sampling and Procurement Testing1This test method is under the jurisdiction of ASTM Committee A06 onMagnetic Properties and is the direct responsibility of Subcommittee A06.01 on TestMethods.Current edition approved May 1,2016.Published May 2016.Originallyapproved in 1969.Last previous edition approved in 2011 as A341/A341M 00(2011)1.DOI:10.1520/A0341_A0341M-16.2The boldface numbers in parentheses refer to a list of references at the end ofthis standard.3For 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 of Magnetic MaterialsA340 Terminology of Symbols and Definitions Relating toMagnetic TestingA596/A596M Test Method for Direct-Current MagneticProperties of Materials Using the Ballistic Method andRing SpecimensA977/A977M Test Method for Magnetic Properties of High-Coercivity Permanent Magnet Materials Using Hyster-esigraphs2.2 IEC Standard:Publication 60404-4,Ed.