① Cov txheej txheem tseem ceeb (cov txheej txheem tshuaj xyuas tseem ceeb) ntawm cov kav dej kub dov seamless steel:
Kev npaj thiab tshuaj xyuas cov yeeb nkab tsis muaj → cua sov ntawm cov yeeb nkab dawb → perforation → dov ntawm cov yeeb nkab → reheating ntawm cov yeeb nkab steel → sizing (txo) → kev kho cua sov → straightening ntawm cov yeeb nkab tiav → tiav → tshuaj xyuas (tsis muaj kev puas tsuaj, lub cev thiab tshuaj lom neeg, kev soj ntsuam lub rooj zaum ) → khaws cia
② Cov txheej txheem tseem ceeb ntawm cov kav dej txias-dov (kho) seamless steel kav yog:
Kev npaj ntawm billets → Acid pickling thiab lubrication → Cold rolling (kos duab) → Thaum tshav kub kub kho → Straightening → Precision finishing → Inspection