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50 kilos which are superior in strength and low temperature tenacity (490MPa) or 60 kilos (588MPa) production mannered null mass of the double weight high tension steel sheet
50 kilos which are superior in strength and low temperature tenacity (490MPa) or 60 kilos (588MPa) production mannered null mass of the double weight high tension steel sheet
PROBLEM TO BE SOLVED: To provide a high tensile strength steel plate small in the variation of the material in the plate thickness direction and also excellent in strength, low temp. toughness and weldability. ;SOLUTION: A slab having a compsn. contg., by weight, 0.005 to 0.12% C, 0.02 to 0.5% Si, 0.3 to 2.2% Mn, ≤0.02% P, ≤0.01% S, 0.01 to 1% Mo, ≤0.05% Al, 0.005 to 0.03% Ti, 0.0005 to 0.003% B and ≤0.01% N, consisting of the balance iron with inevitable impurities and satisfying 0%≤Ti-3.4N≤0.02% is heated at 1000 to 1250°C, is rolled in such a manner that the draft at ≤950°C is controlled to ≥30%, and the finishing temp. is controlled to 700 to 850°C, and, after that, cooling is executed at a cooling rate of 0.05 to 100°C/sec to produce the steel plate. Preferably, it contains one or ≥ two kinds among Nb, Ni, Cr, Cu, V, Ca, Mg and rare earth metals.;COPYRIGHT: (C)2000,JPO
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