High surface quality, continuously cast slab prodn. - by scarfing hot slab and force cooling

摘要

In the prodn. of slabs and the like by continuous casting, the surface of a cast slab is immediately cooled to 500-900 (pref. 700-800) degrees C, flame scarfed and force cooled to below 400 degrees C, pref. within 10 mins. of finishing scarfing. The appts. includes a conveyor between the casting machine and the scarfing station and conveyor between the scarfing station and the cooling station. Opt. a reducing mill stand may be provided between the casting machine and the first conveyor. Residual heat in the casting allows a reduction in fuel and oxygen consumed during scarfing and reheating furnaces are not required. Cooling of the casting for inspection purposes is not required. The forced cooling removes oxide films and avoids further hightemp. oxidation which could conceal defects remaining after scarfing.