PURPOSE: To manufacture a non-heat treated steel plate for welding structures excellent in the toughness of a joint, at the time of working a low carbon steel having a specified compsn. into a plate material by rolling, by subjecting the steel to finish rolling at a specified surface temp. regulated in accordance with its finish plate thickness.
CONSTITUTION: A low carbon slab having a compsn. contg., by weight, 0.02 to 0.16% C, ≤0.7% Si, 0.5 to 1.6% Mn, 0.0010 to 0.0030% S, 0.010 to 0.060% Al, 0.005 to 0.012% Ti, 0.0040 to 0.0060% N and 0.0005 to 0.0015% B or furthermore contg. one or both of ≤1.00% Cu and ≤1.00% Ni as well as satisfying the inequality 1 is heated to 1000 to 1250°C. At the time of subjecting the high temp. slab to finish rolling at ≥40% draft to manufacture a steel plate, it is executed in the temp. range of 760 to A°C steel plate surface temp. [where A°C=900-(50/8) × finish plate thickness mm] in the case of ≤16mm finish plate thickness, and in the temp. range of 760 to 800°C in the case of ≥16mm plate thickness.
ISHIKAWA TADASHI
HAJI TOSHIAKI
MASUNAGA HIDEKATSU
JPS58110658A | 1983-07-01 | |||
JPS5834131A | 1983-02-28 | |||
JPS6067621A | 1985-04-18 | |||
JPS5913022A | 1984-01-23 | |||
JPS5625923A | 1981-03-12 | |||
JPS62174324A | 1987-07-31 |