Gabatarwa
Idan an wuce matsakaici na chromium zuwa 12%, za a haɗa Cr₇C₃ carbides mai mahimmanci da microhardness ta HV1300~1800, wanda ke da kyau fiye da Fe₃C a daraja mai zurfi babba (HV800~1100), yayin da ya haifar da alkarbaruwa mai kyau.
Carbides suna nuna tsari mai gurji ko tsari mai zuma, maimakon saukin hankali; ta hanyar yadda wasu abubuwan tattalin arziki ke iya canza sararin dukkan austenitic zuwa dukkan martensitic, kamar yadda zai yiwuwa don duka irin halayyensa.