I ke ola o kēlā me kēia lā, ʻōlelo mau ka poʻe i ke kila a me ka hao e like me "steel".Hiki ke ʻike ʻia he ʻano mea waiwai ke kila a me ka hao;ʻoiaʻiʻo, mai ka ʻike ʻepekema, he ʻokoʻa iki ke kila a me ka hao, ʻo kā lākou mau mea nui he hao a pau, akā ʻokoʻa ka nui o ke kalapona i loko.Kāhea mākou i ka "puaʻa hao" me kahi kalapona ma luna o 2%, a me "steel" me kahi kalapona ma lalo o kēia waiwai.No laila, i ka hoʻoheheʻe ʻana i ka hao a me ke kila, hoʻoheheʻe mua ʻia ka hao i loko o ka hao puaʻa i hoʻoheheʻe ʻia i loko o ka umu (blast furnace), a laila hoʻokomo ʻia ka hao puaʻa i hoʻoheheʻe ʻia i loko o ka umu hana kila e hoʻomaʻemaʻe ʻia i ke kila.A laila, hoʻohana ʻia ke kila (ke kila a i ʻole ka ʻili) no ka hana ʻana i nā paipu kila, no ka laʻana, hiki ke hana ʻia nā pila kila kalapona i mau paipu kila me nā ʻāpana ʻāwaha ma o nā kaʻina ʻōwili wela a me nā kaʻina ʻōwili anu (nā paipu kila kila.

Hoʻokaʻawale ʻia ke kaʻina hana o nā paipu kila seamless i ʻelua mau ʻanuʻu nui:

1. 'Owili wela (extruded seamless paipu kila): poepoe paipu billet → wela → hou aku → ekolu-roll kea olokaa, hoomau olokaa a extrusion → wehe 'ana → nui (ai 'ole ho'ēmi) → hooluolu → hoʻopololei → hydraulic ho'āʻo (aiʻole flaw detection) → hōʻailona → hale kūʻai

2. He paipu kila maʻemaʻe i huki ʻia (ʻōwili) ʻia: pahu pōʻai pōʻai → hoʻomehana → hoʻopiʻi → poʻomanaʻo → annealing → pickling → ʻaila (kau keleawe) → kaha kiʻi anuanu (cold rolling) → paipu blank → mālama wela → straightening → hydrostatic hoʻāʻo (ʻike hewa) → māka → waiho.
ʻO nā mea maka e pono ai no ka hanaʻana i ka hao a me ke kila, ua māheleʻia iʻehā mauʻano a ua kūkākūkāʻia ma kahi kaʻawale:ʻo ka māhele mua e kūkākūkā ana i nāʻano mea hao i loko o ka hao;ʻO ka lua o ka māhele e kūkākūkā ana i ka lanahu a me ka coke;ʻO ke kahe (a i ʻole ke kahe) o ka slag, e like me ka limestone, etc.;ʻO ka māhele hope loa he mau mea kōkua kōkua like ʻole, e like me ke kila scrap, oxygen, etc.