METHOD FOR PRODUCING LOW CARBON-EQUIVALENT ROLLED STEEL SHAPES BY CONTROLLED ROLLING.

摘要

A method for producing a steel section by a rolling process including a rough rolling step, an intermediate rolling step and a finishing rolling step. The intermediate rolling step comprises water-cooling the flange portion of the rough-rolled steel section between rolling passes in the intermediate rolling step to cool the surface layer of the flange to a temperature not higher than 750 DEG C, and rolling the flange portion during recuperation of the surface layer of the flange at least one time between the rolling passes with a total draft not less than 20% and at an average rolling temperature not higher than 950 DEG C and, after the finishing rolling step the outer surface of the flange is cooled at a cooling rate ranging from 0.5 to 10 DEG C/sec depending on the thickness of the flange. Also the carbon equivalent of the steel is controlled. The advantage is that steel sections of various contours and dimensions can be produced from minimized varieties of steel compositions.