MANUFACTURING METHOD FOR HIGH-STRENGTH COLD-ROLLED STEEL PLATE

PROBLEM TO BE SOLVED: To provide a method for stably manufacturing a high-strength cold- rolled steel plate with less variance in strength by continuous annealing. SOLUTION: In the method for manufacturing the high-strength cold-rolled steel plate by using a continuous annealing facility having a hardening means and a tempering means, the relationship between the rolling load P0 per unit width of the steel plate to be rolled in a skinpass mill disposed on the outlet side of the continuous annealing facility and the tensile strength TS0 of the steel plate to be rolled is determined for each thickness of the steel plate in advance, the tensile strength TS1 of the steel plate is calculated from the rolling load P1 per unit width of the steel plate measured in the skinpass mill based on the relationship between the rolling load P0 and the tensile strength TS0 , and the hardening temperature and/or the tempering temperature of the steel plate is controlled so that the calculated tensile strength TS1 becomes the desired tensile strength.