| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for efficiently manufacture channel steel small in deformation such as camber in the case that the channel steel whose web thickness is thicker than the thickness of flanges are manufactured by rolling. SOLUTION: In this manufacturing method of channel steel, the temp. of flanges at the time of completing finish rolling is made to be lower than a transformation starting temp. Ar1 while water-cooling a web or the web and the flanges during rolling and finish rolling is completed at a flange temp. (for example, a point (b)) and a web temp. (for example, the point (a)) where the elongation of the flanges and the web is approximately the same. |
