METHOD OF AND DEVICE FOR MANUFACTURING-SHAPED STEEL

摘要

PROBLEM TO BE SOLVED: To provide a manufacture method that thermal strain is small and does not need the process for rectifying the warp in manufacture of H-shaped steel wherein accelerated cooling is carried out after finish rolling. SOLUTION: A process which carries out accelerated cooling of the flange inside-and-outside surface and a process which carries out accelerated cooling only from flange external surface perform continuously one by one after finish rolling, and further time distribution of these steps in accelerated cooling processes and an inside-and-outside surface density ratio in water amount (the density in water amount of inside surface/the density in water amount of external surface in the process which carries out acceleration cooling of the inside- and-outside surface) are selected so that thermal strain (Δh of opening quantity in the foot tip/hm of permissible opening quantity in the foot tip in H-shaped steel) is within the tolerance.