Lub billet siv hauv kev tsim cov kav hlau yog hu ua tube billet. Feem ntau cov khoom zoo (los yog alloy) cov khoom siv puag ncig steel yog siv los ua lub raj xa dej. Raws li kev sib txawv ntau lawm, seamless raj muaj billets ua los ntawm steel ingots, nruam casting billets, forging billets, dov billets thiab centrifugally cam khwb cia hollow billets.Vim qhov zoo ntawm lub raj billet loj txiav txim siab qhov zoo ntawm seamless steel raj, kev npaj ntawm lub raj billet yog qhov tseem ceeb tshwj xeeb.

Feem ntau, lub raj dawb yog hais txog ib lub raj xaim hluav taws xob. Qhov luaj li cas ntawm round raj billet yog sawv cev los ntawm txoj kab uas hla ntawm cov khoom round steel. Tube billet npaj muaj xws li xaiv tube billet qauv thiab specification, tshuaj muaj pes tsawg leeg thiab cov qauv tshuaj xyuas, nto defect tshuaj xyuas thiab tu, txiav, centering, thiab lwm yam.
Kev tsim cov txheej txheem ntawm seamless steel tube billet yog raws li hauv qab no:

Ironmaking - Steelmaking - Qhib Hearth Steel (los yog Hluav Taws Xob Hluav Taws Xob Hlau thiab Oxygen Blowing Converter Steel) - Ingot - Billeting - Rolled Round Bar - Tube Billet

A) Kev faib tawm ntawm seamless steel tube billets

Seamless steel tube billet tuaj yeem raug cais raws li txoj kev ua, tshuaj lom neeg muaj pes tsawg leeg, txoj kev tsim, kev siv, thiab lwm yam.
Piv txwv li, raws li txoj kev kho mob, nws muaj peev xwm muab faib ua hluav taws xob rauv steel yeeb nkab billet, converter steel yeeb nkab billet thiab electroslag steel yeeb nkab billet; Raws li txoj kev tsim, nws tuaj yeem muab faib ua steel ingot, nruam casting yeeb nkab billet, forged yeeb nkab billet, dov yeeb nkab billet thiab centrifugal casting hollow raj. Raws li cov tshuaj muaj pes tsawg leeg, nws tuaj yeem muab faib ua carbon steel yeeb nkab billet, alloy steel yeeb nkab billet, stainless hlau yeeb nkab billet thiab corrosion-resistant alloy yeeb nkab billet; Drilling thiab geological drilling tube billets, chiv cog tube billets, bearing tube billets, thiab lwm yam tshwj xeeb-lub hom phiaj raj billets.

B) Xaiv cov seamless steel raj billets

Kev xaiv ntawm seamless steel tube billets suav nrog kev xaiv cov qib steel, specifications, smelting txoj kev thiab txoj kev tsim.
Xaiv cov qib steel, ua cov txheej txheem thiab tsim cov txheej txheem raws li cov qauv khoom lossis kev txiav txim siab. Kev xaiv ntawm billet loj yog nyob ntawm kev nrhiav qhov sib thooj billet loj hauv lub rooj dov raws li qhov loj ntawm cov yeeb nkab steel.

Feem ntau, seamless steel yeeb nkab mills siv refined converter steel los yog hluav taws xob rauv hlau rau nruam casting ntawm round billets.
Thaum cov qib steel lossis cov lus qhia tshwj xeeb tsis tuaj yeem nrum txuas ntxiv, cov hlau molten lossis centrifugal casting yog ua rau hauv lub hollow round billet. Thaum qhov loj ntawm lub raj tsis muaj peev xwm ua tau raws li qhov yuav tsum tau ua ntawm qhov sib piv compression, lub raj loj loj tuaj yeem raug xaiv thiab dov los yog forged los ua lub raj khoob uas ua tau raws li qhov loj me. Cov mis laij lej ntawm qhov sib piv compression yog raws li nram no: K = F, 1F qhov twg K yog compression piv; F - qhov chaw hla ntawm lub raj khoob, hli; F - qhov chaw hla ntawm cov yeeb nkab steel, mm.

Thaum muaj cov kev cai nruj ntawm qhov sib xws ntawm lub raj tsis muaj qhov muaj pes tsawg leeg, cov ntsiab lus suav nrog lossis cov ntsiab lus roj, lub raj tsis muaj smelted los ntawm electroslag lossis lub tshuab nqus tsev degassing rauv feem ntau yog siv.