Nippon Kokan Kabushiki Kaisha

Yushiro Chemical Industry Co., Ltd.

Megumu Tanaka

Shinji Akita

Hitoshi Hasegawa

Noboru Kanda

Tatsuharu Oda

Tomoyuki Hirakawa

Toshitaka Wakabayashi

Yasuhiro Sotani

Fuyuhiko Kajiyama

Koji Sakura

Hiroo Hosono

Disclosed herein is a water-dispersion-type hot-rolling lubricant for the production of seamless steel pipes. This lubricant features the inclusion of a salt of a polybasic high molecular acid in addition to fine graphite powder, a water-insoluble fine particulate synthetic resin and water as principal components and fine gilsonite powder as an optional component. Even when the surface temperature of a mandrel bar is in a high temperature range of 100.degree.-400.degree. C., this lubricant can form a uniform and thick coating film on the surface of the bar so that the lubricant can exhibit extremely good hot-rolling lubrication performance.

Water-dispersion lubricant of graphite, particulate resin and high

An inlet table for a restrained mandrel mill includes a plurality of roll units arranged in the pass line direction and the roll units are mechanically swung in synchronism with the forward and backward movements of a mandrel bar, thereby supporting the mandrel bar and/or a shell to be rolled on the pass line and preventing the roll units from striking against a restrained bar for moving the mandrel bar.

Restrained mandrel mill inlet table

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Yokohama, Japan

Megumu Tanaka