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:
Apr. 05, 2011
Filed:
May. 18, 2007
Kenichi Sasaki, Wakayama, JP;
Sumio Iida, Takarazuka, JP;
Shizuo Mori, Yokohama, JP;
Atsushi Ito, Yokohama, JP;
Kenichi Sasaki, Wakayama, JP;
Sumio Iida, Takarazuka, JP;
Shizuo Mori, Yokohama, JP;
Atsushi Ito, Yokohama, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
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.