| 摘要 |
<p>PURPOSE:To establish a means which can correct the ununiformity of temperature distribution in hot rolling of an H-shaped steel exactly and inexpensively and prevent the product yield caused by thermal strain from deteriorating as possible. CONSTITUTION:When the temperature distribution of the H-shaped steel directly after rolling is uniformized, the direct energizing and heating method that alternating current is applied from an electrode in contact with both ends of a stock to be heated to heat it according to the Joule' law is applied and in direct energizing and heating treatment, plural electrodes 16 arranged face to face at both ends of the H-shaped steel 11 directly after rolling on a support table 14 made of non-electric conductor are brought into contact with plural positions of web parts at both ends, at the same time with this, alternating current having a phase shifted 180 deg. to this energizing current is applied to the induction coils arranged in opposition to the flanges of the H-shaped steel and the number of energized electrodes is changed at the initial time and the final time of the energizing time to heat the web only partially and to uniformize the temperature distribution.</p> |
