APPARATUS AND METHOD FOR THE MANUFACTURE OF HOT-ROLLED STEEL

摘要

A continuous casting machine (1,2) for the manufacture of hot-rolled steel strip comprises reducing a slab by means of a roll stand (4) which is a two-high roll stand having a pair of rollers adapted for hot-rolling cast hot slab into strip. The two-high-roll stand is the sole means for reducing the thickness of the slab after full solidification and prior to entry of the strip into reheating means (6). The ratio of the radius of each of the rolls to the thickness of the slab before reduction by the rolls (R-H ratio) should be at least 3 and as the rolling force increases as the degree of reduction increases the square root of the ratio of thickness reduction of the thin slab and the radius of each roll should be less than 1.1 times the arc tangent of the coefficient of friction between the slab and the roll.