MANUFACTURE OF COMPLEX-TYPE SHAPE STEEL BY ROLLING PROCESS

摘要

PURPOSE:To give a preciseness and tenacity to whole of a steel shape, by manufacturing the steel shape through repeated rolling processes with a universal rolling roll. CONSTITUTION:In the first process, an ingot, heated to higher than the recrystallizing temperature region, is subjected to a blooming process through a caliber E of a universal blooming mill group 1 composed of upper and lower H-shaped horizontal rolls (a), (b) and the left and right vertical rolls (c) correspondingly to a prescribed size; hereby, a rough shaped steel material A with a prescribed cruciform cross section is prepared. In the 2nd process, this rough shaped steel material A is reheated to red-hot and is subjected to repeated rolling passes through a caliber F of a universal steel rolling mill group 2 composed of differently sized upper and lower double-H shaped horizontal rolls (a), (d), (e) and the left and right vertical rolls (c); hereby, a semifinished product B with a cross section similar to the shape of the aimed steel shape is obtained; this semifinished product B is turned by 90 deg. and is subjected to repeated rolling passes through the caliber F, and is finished into a steel shape C with a prescribed cross section. In the 3rd process, this steel shape C is subjected to repeated rolling and grinding passes by a piercing mill group for finishing whole of the web part, and a prescribed steel shape is obtained.