1. Chrome whakakikorua i runga i te mata ki te whakapai ake kākahu ātete;
2. Ka whakakikoruatia nga kohao wetewete ki te chromium hei whakapai ake i te rokiroki hinu o te mata me te tere haere ki roto;
3. He mea whakairo ki te mata o roto hei whakapai ake i te elasticity;
4. Ka whakaratohia he waahi rokiroki hinu ki runga i te mata o waho o te mowhiti hei whakahinuhinu;
5. Ko te mata o waho o te mowhiti kua whakakikoruatia ki te parahi hei whakahaere i te rere-i roto;
6. Ka pupuhihia te molybdenum ki te mata o waho o te mowhiti hei whakaiti i te piri me te kakahu.

Ka whakarapopotohia e whai ake nei:
Whakapai ake i te aukati kakahu: whakakikorua chrome, nitriding
Whakapai ake i te mahi tuatahi: whakakikorua parahi, phosphating, sulfurizing
Hei aukati i te kakahu piri: rehu molybdenum