Hauv lub neej niaj hnub, tib neeg ib txwm hais txog hlau thiab hlau ua ke ua "steel". Nws tuaj yeem pom tias cov hlau thiab hlau yuav tsum yog ib yam khoom; Nyob rau hauv qhov tseeb, los ntawm ib tug scientific taw tes ntawm view, hlau thiab hlau muaj ib tug me ntsis txawv, lawv lub ntsiab Cheebtsam yog tag nrho cov hlau, tab sis tus nqi ntawm cov pa roj carbon monoxide yog txawv. Peb feem ntau hu ua "npua hlau" nrog cov ntsiab lus carbon siab tshaj 2%, thiab "steel" nrog cov ntsiab lus carbon hauv qab no. Yog li ntawd, nyob rau hauv tus txheej txheem ntawm smelting hlau thiab hlau, hlau-muaj ore yog thawj smelted mus rau hauv molten npua hlau nyob rau hauv lub moj tej tawg rauv (blast furnace), thiab ces lub molten npua hlau yog muab tso rau hauv lub steelmaking rauv kom refined rau hauv hlau. Tom qab ntawd, steel (steel billet lossis strip) yog siv los ua cov kav hlau, piv txwv li, carbon steel billets tuaj yeem ua rau hauv cov kav hlau nrog hollow seem los ntawm cov txheej txheem kub dov thiab txias dov (carbon steel seamless hlab)

Kev tsim cov txheej txheem ntawm seamless steel raj yog muab faib ua ob theem loj:

1. Kub dov (extruded seamless steel tube): round tube billet → cua sov → tho → peb-yob cross dov, nruam dov los yog extrusion → stripping → sizing (los yog txo) → txias → straightening → hydraulic test (los yog flaw detection) → kos npe → warehouse

2. Cold drawn (rolled) seamless steel tube: round tube blank → heating → tho → heading → annealing → pickling → oiling (tooj liab plating) → multi-pass txias drawing (txias dov) → blank raj → heat treatment → straightening → hydrostatic kuaj (kev kuaj pom qhov tsis haum) → kos npe → cia.
Cov khoom siv raw uas xav tau rau kev tsim cov hlau thiab hlau tau muab faib ua plaub pawg thiab sib tham sib cais: thawj qeb tham txog ntau yam hlau uas muaj ore raw cov ntaub ntawv; qeb thib ob tham txog cov thee thiab coke; Lub flux (los yog flux) ntawm slag, xws li limestone, thiab lwm yam.; qeb kawg yog ntau yam khoom siv raw khoom, xws li cov hlau seem, oxygen, thiab lwm yam.