Carbon steel pipe is formed by hot rolling, cold rolling, or cold drawing of steel ingot or solid pipe blank after perforation. The raw material of the carbon steel pipe is the round billet.
seamless steel pipe
ASTM, AISI, JIS, GB, DIN, EN
Q195, Q235, q355, ASTM A53 gr.a, gr.b, stkm11, st37, ST52, 16Mn, etc
annealing and quenching