The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 1991
Filed:
Aug. 30, 1989
Megumu Tanaka, Yokohama, JP;
Koji Sakura, Yokohama, JP;
Tatsuharu Oda, Chigasaki, JP;
Tomoyuki Hirakawa, Yokohama, JP;
Yasuhiro Sotani, Tokyo, JP;
Fuyuhiko Kajiyama, Yokohama, JP;
Noboru Kanda, Hiratsuka, JP;
Hiroo Hosono, Samukawa, JP;
Toshitaka Wakabayashi, Chigasaki, JP;
Hitoshi Hasegawa, Samukawa, JP;
Nippon Kokan Kabushiki Kaisha, both of, JP;
Yushiro Chemical Industry Co., Ltd., both of, JP;
Abstract
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.