Kub dov seamless steel yeeb nkab los ntawm lub raj mus rau cov khoom feem ntau yuav tsum tau ob lub cua sov, uas perforated raj ua ntej thiab tom qab cua sov thiab dov dawb paug yeeb nkab txoj kab uas hla ntawm ib tug muab pre-rhuab; zus tau tej cov txias-dov (rub) thaum cov yeeb nkab yuav tsum tau siv lub intermediate annealing kom tshem tawm cov residual kev nyuaj siab; steel rau qee qhov tshwj xeeb uas yuav tsum tau ua, txhawm rau txhim kho cov khoom siv ntawm cov yeeb nkab steel thiab txhim kho kev ua haujlwm thiab cov txheej txheem kev ua haujlwm, tab sis kuj nws cov kev kho cua sov. Common tube (pipe) cua sov tube muaj qhov tsis sib xws ntawm cua sov, oxidation, decarbonization, cua sov tawg, overheating, over-burning.

Rhaub pem hauv ntej perforated raj, thiab nws lub hom phiaj yog los txhim kho cov ductility; txo deformation kuj steel; muab zoo microstructure yog dov. Muaj lub tshuab hluav taws xob hluav taws xob hluav taws xob hluav taws xob, lub tshuab hluav taws xob rov qab, lub tshuab hluav taws xob inclined thiab lub tshuab hluav taws xob hauv qab tsheb. Muab qhov tsis txaus ntawm cov yeeb nkab txoj kab uas hla ua ntej reheating, uas yog lub hom phiaj los ua kom lub qhov kub thiab txias ntawm lub raj thiab ib qho kev tsis txaus thiab txhim kho cov ductility ntawm cov hlau, tswj nws cov microstructure, tsim cov kev mob zoo rau cov niam cov yeeb nkab sizing thiab xyuas kom meej cov khoom ntawm cov hlau. Common hom reheating rauv stepping furnace, nruam rau cov menyuam hearth reheating rauv, lub cub tawg hearth oblique, inductive reheating rauv. Txias-dov (rub) reheating hardening tsuas yog tshem tawm, txo deformation kuj. Common annealing rauv yog tsuas yog siv nyob rau hauv reheating rauv, tsheb hauv qab rauv, nruam rau cov menyuam hearth rauv. Nyob rau hauv zus tau tej cov seamless steel hlab, annular rauv thiab reheating rauv yog tam sim no feem ntau lug siv; hluav taws xob induction rauv kuj raug tsim; inclined hearth cua sov rauv vim qhov zoo tsis siab, siv zog ntau thiab zoo li yuav raug tshem tawm. Nruam rau cov menyuam hearth rauv yog tsuas yog siv rau hauv txias-dov (rub) kev kho cua sov ntawm cov hlau; tsheb hauv qab rauv haum rau cov khoom me me, lub sij hawm kho cua sov yog ntev cua sov thiab rwb thaiv tsev tuab-walled alloy steel yeeb nkab; Kev tiv thaiv roj txuas ntxiv rau cov menyuam lub tshuab hluav taws xob feem ntau yog siv rau hauv cov hlau saum npoo yuav tsum tau kho cua sov thiab txias tiav steel yam tsis muaj oxidation (rub) thaum lub sij hawm pickling txheej txheem annealing.