| 摘要 |
PURPOSE:To produce a titled hot rolled steel pipe having excellent workability after making of pipes easily and economically, by hot-rolling the low carbon aluminum kelled steel which is limited in the chemical compsn. of C, Si, Mn, Al, B, N, etc. under specific conditions. CONSTITUTION:The aluminum killed steel contg. 0.025-0.06% or 0.001-0.009% C, <=0.03% Si, 0.10-0.25% Mn, 0.005-0.08% SolAl, 0.0010-0.0040% B, <= 0.0030% N, and if necessary, consisting further of 0.005-0.030% 1 or 2 kinds Ti or V and the balance Fe and unavoidable impurities is hot rolled at Ar3+ 40 deg.C finishing temp. of hot strips and further >=650 deg.C coiling temp. down to a prescribed thickness, whereby the hot steel plate which yields intended products easily and economically without requiring any special heat treatments after pipe making for the rupture or shape defects during working to pipes is obtained. |
