Kev tsim cov kav dej seamless steel muaj keeb kwm ze li ntawm 100 xyoo. Cov kwv tij German Mannismann thawj zaug tau tsim lub tshuab ob-rolling cross-rolling piercing tshuab nyob rau hauv 1885, thiab invented lub periodic tube rolling tshuab nyob rau hauv 1891. Nyob rau hauv 1903, lub Swiss R Stiefel (RCStiefel) invented lub automatic raj dov tshuab (tseem hu ua lub taub hau. Rolling tshuab). Cov yeeb nkab mills), thiab ntau lub tshuab txuas ntxiv xws li cov yeeb nkab txuas txuas ntxiv thiab cov yeeb nkab jacking tshuab tau tshwm sim yav tom ntej, thiab kev lag luam niaj hnub seamless steel yeeb nkab kev lag luam pib tsim. Nyob rau xyoo 1930, vim yog kev txais yuav ntawm peb-yob yeeb nkab dov zeb, extruder, thiab lub caij txias dov yeeb nkab zeb, ntau yam thiab zoo ntawm cov kav hlau steel tau txhim kho. Nyob rau xyoo 1960, vim yog kev txhim kho ntawm qhov nruam dov zeb, qhov tshwm sim ntawm peb-yob piercing tshuab, tshwj xeeb tshaj yog kev vam meej ntawm daim ntawv thov ntawm qhov nro reducer thiab nruam casting billet, txhim kho kev tsim khoom thiab txhim kho lub peev xwm ntawm seamless kav. sib tw nrog welded kav. Nyob rau xyoo 1970, cov kav dej seamless thiab welded kav tau sib koom tes, thiab lub ntiaj teb' cov yeeb nkab steel ntau lawm tau nce ntawm tus nqi ntau dua 5% hauv ib xyoos. Tom qab xyoo 1953, Tuam Tshoj txuas ntxiv qhov tseem ceeb rau txoj kev loj hlob ntawm seamless steel yeeb nkab kev lag luam, thiab tau pib tsim cov txheej txheem ntau lawm rau dov ntau yam loj, nruab nrab thiab me kav. Cov kav dej tooj liab feem ntau kuj tau txais ingot slanting piercing, raj dov, thiab coil drawing txheej txheem. Tsis siv neeg dov yeeb nkab ntau lawm yog ib txoj hauv kev los tsim seamless steel kav. Cov khoom siv ntau lawm muaj lub tshuab tho, lub tshuab tsis siv neeg cov yeeb nkab dov, ib qho sib npaug, lub tshuab sizing thiab lub tshuab txo.
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