1. Ƙarfe mai zafin wuta Gwajin taurin quenched da zafin karfe yana amfani da ma'aunin ma'aunin Rockwell hardness tester HRC.Idan kayan yana da bakin ciki kuma sikelin HRC bai dace ba, ana iya amfani da sikelin HRA maimakon.Idan kayan ya fi sirara, saman Rockwell taurin ma'auni HR15N, HR30N, ko HR45N...
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