Mitsui Toatsu Chemicals, Incorporated

Sumitomo Metal Industries, Inc.

Nkk Corporation

Burlington Northern Railroad Company

Atsushi Ito

Jun Furukawa

Kenichi Sasaki

Masahiro Ueda

Sumio Iida

Toshihiko Takaki

Kozo Fukuda

Shizuo Mori

Tsugio Matsubara

Yuzuru Kataoka

Hideyuki Yamanaka

Kenji Tsuboi

Tomoo Horita

Takao Gino

Shouichi Araseki

John A Hovland

Gordon O Besch

Tetsunari Ide

With a powdered lubricant composition by the invention, in addition to the blending of one of anhydrous, pentahydrate or decahydrate salt in sodium borate and one of sodium or calcium salt of fat acid, mixing calcium or lithium carbonate as an auxiliary lubricant can prevent sodium borate (NaBO), solidified as amorphous after a tube-making process, from moisture absorbance, drying and crystallization to thereby suppress the formation of NaBO.5HO on inside surfaces of finished-product tubes, thus enabling to circumvent occurrence of the white scales. Concurrently, they provide good diffusivity toward the working surface of workpiece, thus enabling to prolong a life of the mandrel bar and to widely be adopted as the most suitable powdered lubricant for manufacturing seamless tubes by Mandrel Mill rolling.

Powdered lubricant composition for hot working and method for manufacturing seamless tubes

A hydraulic cement composition comprising as an effective component a water-soluble amphoteric polymer obtained by Hofmann degradation reaction of an .alpha.,.beta.-unsaturated carbonamide polymer or a copolymer of .alpha.,.beta.-unsaturated carbonamide and an anionic monomer having a weight average molecular weight of 1,000-1,000,000. The primary amino group produced as a result of the Hofmann degradation reaction provides excellent cement dispersing capabilities.

Admixture for hydraulic cement

A high-strength, damage-resistant rail characterized by essentially consists of 0.60 to 0.85 wt. % of C, 0.1 to 1.0 wt. % of Si, 0.5 to 1.5 wt. % of Mn, not more than 0.035 wt. % of P, not more than 0.040 wt. % of S, and not more than 0.05 wt. % of Al, a balance being Fe and indispensable impurity. The rail comprises corner and head side portions having a Brinell hardness H.sub.B of 341 to 405 and a head top portion having a hardness which is not more than 0.9 of the Brinell hardness of the corner and head side portions.

High-strength, damage-resistant rail

Growing community of inventors

Yokohama, Japan

Atsushi Ito