Ko te pereti kowiri tira he kupu whānui mō te pereti kowiri tira me te pereti kowiri tira ātete-waikawa. I te tīmatanga o tēnei rautau, kua whakatakotohia e te whanaketanga o te pereti kowiri tira he turanga rauemi me te hangarau nui mō te whanaketanga o te ahumahi hou me te ahunga whakamua pūtaiao me te hangarau. He maha ngā momo pereti kowiri tira me ngā āhuatanga rerekē, ā, kua āta hangaia he maha ngā kāwai i roto i te tukanga whanaketanga. E ai ki te hanganga, ka wehea kia whā ngā kāwai: te pereti kowiri tira austenitic, te pereti kowiri tira martensitic (tae atu ki te pereti kowiri tira whakapakeketanga), te pereti kowiri tira ferritic, me te pereti kowiri tira duplex ferritic austenitic. E ai ki te hanganga matū matua o te pereti kowiri tira, ki ētahi āhuatanga rānei o te pereti kowiri tira hei whakarōpū, ka wehea ki te pereti kowiri tira chromium, te pereti kowiri tira nikara chromium, te pereti kowiri tira nikara chromium molybdenum me te pereti kowiri tira waro iti, te pereti kowiri tira molybdenum teitei, te pereti kowiri tira parakore teitei me ētahi atu. E ai ki ngā āhuatanga mahi me ngā whakamahinga o te pereti maitai, ka wehea kia rua: te pereti maitai kore waikura ātete waikawa hauota, te pereti maitai kore waikura ātete waikawa whanariki, te pereti maitai kore poka, te pereti maitai kore waikura ātete ki te ahotea, te pereti maitai kore kaha teitei, me ētahi atu. E ai ki ngā āhuatanga mahi o te pereti maitai, ka wehea kia rua: te pereti maitai kore waikura pāmahana iti, te pereti maitai kore aukume kore, te pereti maitai kore waikura ngāwari tapahi, te pereti maitai kore waikura kirihou nui. Ko te tikanga whakarōpū e whakamahia whānuitia ana ka whakarōpūtia kia rua: te pereti maitai kore waikura martensitic, te pereti maitai kore waikura ferritic, te pereti maitai kore waikura austenitic, te pereti maitai kore waikura takirua me te pereti maitai kore waikura momo whakapakeketanga, te pereti maitai kore waikura chromium me te pereti maitai kore waikura nikara. Ngā whakamahinga noa: taputapu penupenu me te pepa, whakawhiti wera, taputapu miihini, taputapu tae, taputapu horoi kiriata, paipa, rauemi hanga o waho o te rohe takutai, me ētahi atu.
He maeneene te mata o te pereti maitai kore waikura, he tino kirihou, he pakari, he kaha ā-ringa hoki, ā, he ātete ki te waikura waikawa, te hau kawakore, te wairewa me ētahi atu mea. He maitai koranu tēnei, kāore e waikura ngāwari, engari kāore i te tino kore waikura.