Standard Test Methods for Determining the Inclusion Content of Steel

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标准简介

Designation: E45-18 Standard Test Methods for Determining the Inclusion Content of Steel'1. Scopel.l These test methods cover a number of recognizedprocedurcs for dctermining the nonmctallic inclusion contentof wrought steel. Macroscopic methods include macroetch,fracture, step-down,and magnetic particle tests.Microscopicmethods include five generally accepted systems of examina-tion. In these microscopic methodis,inclusions are assigncd toa category based onsimilarities in morphology. and notnecessarily on their chemical identity. Metallographic tech-niques that allow simple differentiation between morphologi-cally similar inclusions are briefly discussed.While the meth-ods are primarily intended for rating inclusions.constituentssuch as carbides,nitrides. carbonitrides,borides,and interme-tallic phases may be rated using some of thc microscopicmethods. In some cases,alloys other than steels may be ratedusing one or more of these methods; the methods will bedescribed in terms of thcir use on steels.1.2 These test methods cover procedures to perform JK-typeinclusion ratings using automatic image analysis in accordancewith microscopic methods A and D.1.3 Depending on the type of

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