Whakaahuatanga Hua:
Ka whakamahia te hua i roto i ngā oumu whakamahana ka taea te whakahaere, hei karo i te pānga o te mura o te whare, hei karo rānei i te waikura o te hau o te oumu ki te wāhanga whakamahana. Ka tukuna te tukanga (te hurihanga o te mura o te whare, te hiko rānei) ki roto i te ngongo maitai ātete ahi, ā, ka tukuna te nui o te wera kia puta mā te pakitara o te ngongo. Ka kiia tēnei taputapu ko te ngongo whakamahana.

Ka kati te ngongo whakamahana hiko i te wāhanga whakamahana i roto i te koti, ā, i muri i te hiko me te whakamahana, ka tukuna te wera ki te arai oumu me te mea mahi kia whakamahanahia e te pū. Ka whakamahia te whakamahana o te ngongo whakamahana i roto i te oumu hei tiaki i te oro me te oro waikura, pērā i te oumu tonu, te oumu hurihuri, te oumu poka.

Ngā painga o te paipa:
Ka taea te whakamana i te whakahaere o te oumu whakarongo i roto.
He tino watea te whakahaere i te pāmahana, te huihui me te tiaki, ā, he ngāwari ki te hiri.
Ka whakanuia te pūtu o te takuahi, ā, ka pai ake te rere o te hau nā te mea kāore he pūwero e whakamahia ana.
He kaha te whakamahana me te tino whai hua
He pai te rauemi maitai ātete.
Ngā rauemi o te ngongo:
Me teitei ake te ātete o te rauemi koranu hiko e whakamahia ana e te ngongo whakamahana. He teitei te ōrau o te tahuritanga o te karawaka. Nā te mea kua whakanohoia te ngongo whakamahana ki roto i te pū, he rerekē te tukanga tuku wera mai i te tukanga o te huānga whakamahana momo tuwhera. He nui tōna parenga wera. Me whakahaere te pāmahana o te huānga i te wā e piki ana te pāmahana, kia kore ai e piki haere te pāmahana o te huānga.
Ina katia te ngongo whakamahana, ā, ka whakamahanatia, ka teitei ake te pāmahana o te mata o te wāhanga whakamahana i te pāmahana o te takuahi, tata ki te 100°C~150°C. Nō reira, me tātari te pāmahana o te oumu me te āhuarangi o te pāmahana o te oumu. Kōwhiria he rauemi whakamahana tika.
Ko ngā ngongo whakamahana i hangaia e te kamupene gongtao he maha ngā whakamahinga o te Cr20Ni80, Cr25A15, Cr21A16Nb, Cr27A17Mo2 me ētahi atu.