(2) Lub sijhawm nrov ntawm 60-70s ntawm lub xyoo pua 20th

Tuam Tshoj tus kab yeeb nkab steel tau nrov thiab tsim kom muaj qee yam nyob rau lub sijhawm no. Ua ntej tshaj plaws, nyob rau lub Tsib Hlis 1, 1960, Shanghai tsis φ}}}}}}}}} IREEL TOLLING Mill Tsim thiab Hlau φ140MM Tsis Siv Neeg Rolling Rolling Mill.
Xyoo 1963, Beijing Shajingshan Hlau Thiab Cov Hlau Cawv (Tam Sim No Shougile Spinter Nce Txij thaum ntawd los, Shanghai Steel Yeeb Nkab Hoobkas thiab lwm yam kev siv hluav taws xob siab rau lub siab welded kom tau nce los ntawm 30m / min mus rau 80m / min. Txog xyoo 1970, Tuam Tshoj thawj phau ntawv siv roj vuam thiab hloov cov yeeb nkab welded tam sim no tau raug tshem tawm.
Tom qab, tus tsim dav dav ntawm φ76mm Seamless steel yeeb nkab rhiav thiab φ76mm Welded Yeeb Rhiav thiab nce thoob plaws lub tebchaws. Cov qauv ntawm cov khoom siv hauv kev tsim qauv yog qhov yooj yim, thiab cov cuab yeej siv hluav taws xob kev lag luam thiab cov khoom lag luam hluav taws xob, uas haum rau qhov xwm txheej tiag tiag hauv Suav teb lub sijhawm ntawd. Raws li qhov tshwm sim, Anyang, carbon, Changzhou, Tianjing, Ginjin, Guangzhou, Quangzhou, Quangzhou thiab lwm qhov chaw tau ua tiav welded kav dej thiab seamless steel kav. Cov yeeb nkab steel ntau lawm ntau lawm tau qhia los ntawm Soviet Union tau tshaj tawm hauv Suav teb. Txawm hais tias cov khoom siv no tsis yog li ntawd hauv thev naus laus zis thiab cov khoom lag luam hauv ntiaj teb no, nws tseem muaj ntau lub hauv paus kev lag luam thiab kev tsim kho ntau ntxiv txij thaum ntawd los.