PRODUCTION METHOD FOR STEEL PLATE AND EQUIPMENT THEREFOR

摘要

The invention relates to a method for manufacturing a steel plate comprising the steps of: hot-rolling a steel slab to a steel plate; quenching or accelerated cooling the steel plate; and tempering the steel plate after quenching or accelerated cooling by a solenoid induction heating unit, wherein the step of tempering is conducted by discontinuously heating the steel plate in two or more cycles to a target temperature. The method of the present invention assures on-line tempering for uniformly heating over the whole thickness direction of steel plate without degrading the productivity and overheating the surface of steel plate to above the target level.