Te whakamahi ahumahi okowiri tirakia rite ki te whakahaere metallographic e taea te wehea ki toru kāwai: ferritic kowiri tira, martensitic kowiri tira, austenitic kowiri tira. Ka taea e te reira i te āhuatanga o enei momo e toru o te kowiri tira (rite whakaaturia i roto i te tepu i raro nei), engari kia tuhia te reira e kore e taea te paiherea katoa te martensitic kowiri tira, engari anake e etahi tikanga, pērā i fehokotaki'anga kia preheated i muri i fehokotaki'anga kia teitei pāmahana riri kia he uaua ake te tukanga fehokotaki'anga. Ko te tino hanga o etahi kowiri tira martensitic penei i te 1Cr13, 2Cr13 me te 2Cr13 me te 45 te whakarewa maitai, neke atu ranei.

Ko te kowiri tira Ferritic no te chrome kowiri tira
He iti te ihirangi waro, anti-kohauhau, waikawa nitric me te wairewa tote kaha te waikura, te teitei o te wera o te waikura me etahi atu. Te nuinga whakamahia i roto i te hanga o te taputapu matū i roto i te ipu, paipa.

Austenitic kowiri tira ko chrome nika kowiri tira
He nui te parenga waikura, te kirihou pai, te pai o te weldability me te iti o te pāmahana, kaore he autō, he ngawari ki te mahi whakapakeke. Te nuinga whakamahia i roto i te mahi pāpāho ha'iriiri i roto i nga wahi, ipu, paipa, taputapu hauora me te taiao anti-autō.