Method of manufacturing extra-thick, high strength steel sheets

Details Method of manufacturing extra-thick, high strength steel sheets Method of manufacturing extra-thick, high strength steel sheets

C - Chemistry, Metallurgy

21

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C21D 8/02 (2006.01) C21D 1/25 (2006.01) C21D 1/78 (2006.01) C22C 38/38 (2006.01)

Patent

CA 1291400

Abstract of the Disclosure A method of manufacturing extra-thick, high strength steel sheets comprises hot rolling a steel slab having the given chemical composition at a draft of not less than 30% within a predetermined temperature range, directly quenching by cooling at an average cooling rate of 1.0°C/sec or cooling and reheating to 800-950°C and quenching, and then subjecting to Cu precipitation hardening by heating to 500-650°C. The thus obtained steel sheets have excellent weldability and low-temperature toughness and a tensile strength of not less than 80 kgf/mm2.

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