| 摘要 |
PURPOSE:To produce H-shaped steel having no web waves by determining the finishing temps. of flanges and a web according to an evaluating index for web waves and controlling temp. by holding the heat of the web or cooling the flanges with water cooling. CONSTITUTION:An evaluating index Wc for webs for evaluating the shape defects of the web waves of H-shaped steel is expressed by the equation. By said equation, the target finishing temps. of flanges 1 and a web 2 are determined. Thereafter, the finishing temps. of the flanges 1 and the web 2 are determined in such a way that the index Wc attains <=1, and the heat of the web 3 is held by using a plate 3 for preventing heat radiation or the flange 1 is water-cooled by using water coolers 4 for the flanges or both treatments are performed in the stage before the finish rolling in such a way that said finishing temps. are attained, whereby the H-shaped steel having no web waves is obtained. |
