Nui nā ʻano haʻilula a me nā mīkini helu pūnaewele e hiki ai i kekahi ke helu maʻalahi i ke kaumaha o ke kila kila.

Ua hoʻokaʻawale ʻia ke kila kila ma lalo o 5 mau māhele a ʻo kēia mau mea ka moʻo 200 a me 300 o ke kila kila i ʻike ʻia ʻo nā kila kila austenitic. A laila aia ka moʻo 400, ʻo ia nā kila kila ferritic. ʻO ka moʻo 400 a me ka moʻo 500 i kapa ʻia he kila kila martensitic. A laila aia nā ʻano PH o ke kila kila, ʻo ia nā kila kila precipitation hardening grade.

A ʻo ka mea hope loa, aia ka hui ʻana o nā kila kila ferritic a me austenitic, i ʻike ʻia ʻo nā kila kila duplex.