The present invention relates to a steel sheet having a small amount of welding deformation and good bending workability by linear heating, a method for manufacturing the steel sheet, a welding material and a welding method thereof (STEEL PLATE HAVING LOW WELDING STRAIN AND GOOD BENDING WORKABILITY BY LINEAR HEATING AND METHOD FOR PRODUCING THE SAME AND WELDING MATERIAL AND METHOD FOR PRODUCING THE SAME)

摘要

The present invention relates to a steel material which comprises a steel material in an amount of 0.02 to 0.25% by weight, 0.01 to 2.0% of Si, 0.30 to 1.5% of Mn, 0.003 to 0.10% of Al, 0.005 to 0.10% of Nb, 0.05 to 1.00% of Mo, (In particular, the upper limit of Nb and Mo is set to 0.025% in the case of a plate thickness of 3 to 25 mm) is specified for the component consisting of Fe and inevitable impurities, As the stress, the yield stress at the temperature T of the steel sheet over the room temperature of-600C_yTAnd yield stress at room temperature_yIs within the range of the following formula.;1.00 to 1.083 10^-3T (_yT/ _y) 1.16 to 5.101 x 10^-4T;In addition, by specifying the components of the welding material,₃The transformation temperature is set to less than 620 DEG C and the yield stress of the deposited metal ranges from room temperature to-600 DEG C. and the temperature T_oThe yield stress _yoToAnd yield stress at room temperature_yoIs within the range of the following formula.;1.00 to 1.083 10^-3T_oyoTo/ _yo1.16 to 5.101 10^-4T_o;The steel sheet is welded by the welding material to provide a welded steel sheet with little weld deformation.