| 摘要 |
PURPOSE: To provide a hot-rolling method of a steel cast slab capable of preventing the development of surface flaw, in the method for rolling a bloom or a product without cooling a Al-deoxidized steel to the room temp. after continuous casting. CONSTITUTION: In the steel having a compsn. containing the specific quantities of C, Si, Mn and Al and one or more than two kinds selected from among Cr, Mo, Ni and V, the surface temp. of the cast slab after continuous casting is cooled to <=800 deg.C. Thereafter, the cast slab is heated or recuperated to 850-1050 deg.C, and then, cooled at <=600 deg.C for >=30sec. Thereafter, the cast slab is heated to 1050-1200 deg.C to execute the hor-rolling. By this method, the surface flaw of crack, etc., is eliminated because of the fining ofγgrain before blooming or rolling and the harmlessness of AlN.
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