Standard Method of Macroetch Testing Steel Bars,Billets,Blooms, andForgings

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标准简介

Designation: E381-20 Standard Method of Macroetch Testing Steel Bars,Billets,Blooms, andForgings11. Scope=1.1 Macroetching，which is the etching of specimens formacrostructural examination at low magnifications.is a fre-quently used technique for evaluating steel products such asbars,billets,blooams, and forgings.1.2 Included in this method is a procedure for rating steelspecimens by a graded series of photographs showing theincidence of certain conditions. The method is limited inapplication to bars, billets,blooms, and forgings of carbon andlow alloy stecls.1.3 A number of different etching reagents may be usedcepcnding upon the type of examination to be madc. Steelsreact differently to etching reagents because of variations inchemical composition. method of manufacture. heat treatmentand many other variables.Establishment of general standardsfor acceptance or rejection for all conditions is impractical assome conditions must be considered relative to the part inwhich it occurs.1.4 This standard does nor purporr to adldress all of thesafety concerns.if any. associated wirh iss use. it is therespovsibility of the user of this standard to establish appro-priate sefety,healrha. cand

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