He aha ka ʻokoʻa ma waena o 430 a me 439 kila kila?

ʻO ke kila kila he mea hoʻohui i hoʻohana nui ʻia i ke ola o kēlā me kēia lā a me ka hana ʻoihana, a ua makemake ʻia no kona kūpaʻa maikaʻi a me ka ikaika. Ma waena o nā ʻano he nui o ke kila kila, 430 a me 439 ʻelua mau ʻano maʻamau, akā aia kekahi mau ʻokoʻa koʻikoʻi ma waena o lākou.

Mai ka manaʻo hoʻohui kemika

ʻO 430 ke kila kila he huila i loaʻa ka 16-18% chromium a ʻaʻohe nickel. Hāʻawi kēia iā ia i ke kūpaʻa corrosion maikaʻi loa i kekahi mau kaiapuni, ʻoi aku hoʻi i ka media oxidizing. ʻO 439 ke kila kila he huila i loaʻa ka 17-19% chromium a me 2-3% nickel. ʻO ka hoʻohui ʻana o ka nickel ʻaʻole e hoʻomaikaʻi wale i ke kūpaʻa corrosion o ka mea, akā hoʻonui pū i kona paʻakikī a me ka hana.

Ma ke ano o na waiwai kino

ʻO 430 he kila kila martensitic me ka paʻakikī kiʻekiʻe a me ka ikaika, akā haʻahaʻa haʻahaʻa a me ka paʻakikī. ʻOi aku kēia i kūpono no kekahi mau noi kahi e koi ʻia ai ka ikaika kiʻekiʻe. ʻO 439 ke kila kila he ʻano austenitic stainless steel, me ka ductility maikaʻi a me ka paʻakikī, hiki ke kū i ka deformation nui a ʻaʻole maʻalahi e wāwahi.

Eia kekahi, aia nā ʻokoʻa ma waena o nā mea ʻelua ma ke kahua o ka noi. Ma muli o ka pale ʻana i ka corrosion a me ka ikaika kiʻekiʻe o 430 stainless steel, hoʻohana pinepine ʻia i ka hana ʻana i nā ʻōnaehana exhaust automotive, nā mīkini holoi, nā lako kīhini a me nā mea ʻē aʻe e pono ai ke kū i nā mahana kiʻekiʻe a me nā wahi corrosive. Hoʻohana nui ʻia ʻo 439 stainless steel i ka petrochemical, nā lāʻau lapaʻau, ka hoʻoili ʻana i ka meaʻai a me nā māla ʻē aʻe ma muli o kāna mau ʻano hana maikaʻi a me ka pale ʻana i ka corrosion.

I ka hōʻuluʻulu ʻana, ʻo 430 a me 439 ke kila kila i kekahi mau ʻokoʻa i ka haku melemele, nā waiwai kino a me nā kahua noi. ʻO ka hoʻomaopopo ʻana i kēia mau ʻokoʻa e kōkua iā mākou e koho maikaʻi a hoʻohana i nā mea kila kila e hoʻokō i nā pono o nā kaiapuni like ʻole a me nā noi.