Ka taea te wehewehe i te hiko hiko kowiri tira ki roto i te chromium kowiri tira hiko me te chromium nickel kowiri hiko hiko, enei momo e rua o nga hiko i runga i te paerewa o te motu, e rite ana ki te aromatawai GB / T983 -1995.Chromium kowiri tira irahiko tohutohu whakamahi, chromium kowiri tira he etahi parenga waikura (waikawa oxidizing, waikawa waro, cavitation) wera me te waikura ātete.