Nippon Kokan Kabushiki Kaisha

Yukio Haga

Shunichi Sugiyama

Kazuo Kunioka

Masahiro Tsuru

Atsushi Ohsumi

Kohichiroh Miyauchi

Gengi Kanatani

Tsutomu Izumi

Tomeo Kai

Akira Shirayama

A claw crane well suited for loading and unloading, transporting and stacking steel products such as blooms, includes a mast suspended from the crane proper to be moved vertically, a beam tiltably attached to the lower end of the mast, and a plurality of load carrying claw shifters and load unloading pusher means which are movably arranged on the beam.

Claw crane with pushers

A steel ingot having a still-liquid portion therein is charged into a soaking pit; then, said ingot is heated by injecting a fuel from a combustion unit of said soaking pit into said soaking pit with a constant and minimum fuel flow rate capable of holding a pit temperature higher by from 10 to 100.degree. C than the cold point temperature of said ingot at the completion of solidification of said still-liquid portion in said ingot, until said still-liquid portion in said ingot is completely solidified; and then, upon the completion of said solidification, the surface portions of said ingot are further heated up to above a prescribed temperature permitting rolling thereof by injecting a fuel from said combustion unit into said soaking pit with a constant fuel flow rate of at least 60% of the maximum fuel flow rate of said combustion unit, thereby reducing the fuel consumption in said soaking pit.

Method for heating ingot in soaking pit

Growing community of inventors

Fukuyama, Japan

Yukio Haga