| 摘要 |
PURPOSE:To improve the toughness, and to prevent a rupture accident by specifying the quality of a material hot rolling conditions, and also lowering a temperature of a base metal at the time of welding. CONSTITUTION:A billet containing 0.60-1.00% C, and one kind or more of <=0.020% Ti and 0.010-0.040% Nb in accordance with necessity is brought to hot rolling at a finish temperature of 700-800 deg.C. Subsequently, a high-carbon steel strip wound at a winding temperature of <=600 deg.C is joined and the continuous processing is performed. In this case, a temperature of the steel strip of the time of joining is set to 120 deg.C. In this way, a rupture accident of a joint of the steel strip is prevented. |
