Muaj peb txheej txheem yooj yim rau cov raj kub dov: ① Lub ingot lossis billet yog threaded rau hauv lub hollow tuab-walled capillary raj ntawm lub tshuab tho; ② Lub raj capillary yog dov nyias ntawm lub tshuab ncab thiab ncab rau hauv lub raj khib nyiab ze ntawm phab ntsa tuab ntawm cov khoom tiav; ③ Rolled rau ntawm lub tshuab tiav Lub raj yuav tsum tau ua tiav. Lub raj rolling mill series yog sawv cev los ntawm qhov siab tshaj plaws sab nraud ntawm cov hlau ua lub raj (saib dov zeb). Saib Table 1 rau kev tsim cov kav dej seamless steel. Cov lej hauv kab lus yog xyoo tsim.
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