Nippon Kokan Kabushiki Kaisha

Yushiro Chemical Industry Co., Ltd.

Noboru Kanda

Tatsuharu Oda

Shinji Akita

Masayuki Hatanaka

Hitoshi Hasegawa

Megumu Tanaka

Toshitaka Wakabayashi

Koji Sakura

Fuyuhiko Kajiyama

Yasuhiro Sotani

Kenzou Yokoyama

Ken-ichi Aoki

Tomoyuki Hirakawa

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

A lubricant for the production of seamless tubes comprising water-insoluble fine synthetic resin particles, fine gilsonite and graphite, in which about 30 parts by weight of water-insoluble fine synthetic resin particles, from about 15 to about 30 parts by weight of fine gilsonite particles and from about 40 to about 55 parts by weight of fine graphite powder are contained.

Lubricant for the production of seamless tubes

Growing community of inventors

Hiratsuka, Japan

Noboru Kanda