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:
Jun. 26, 1984
Filed:
May. 27, 1983
Seiichi Masuda, Nishinomiya, JP;
Tohru Matsuo, Nishinomiya, JP;
Yoshimichi Ohkita, Nishinomiya, JP;
Takeo Aoki, Kawanishi, JP;
Hidemasa Nakajima, Iharaki, JP;
Shozo Okamura, Ibaraki, JP;
Takeyuki Hirata, Ibaraki, JP;
Shoji Anezaki, Ibaraki, JP;
Sumitomo Metal Industries, Inc., Osaka, JP;
Abstract
A process for producing an ultra-low phosphorus steel containing 0.010% or less of phosphorus is disclosed, which comprises charging a desiliconized pig iron into a top- and bottom-blowing oxygen converter, introducing a slag-forming agent in a powdered form onto the molten iron together with the top-blowing oxygen and introducing a bottom-blowing gas selected from the group consisting of an inert gas, nitrogen gas, oxygen gas, carbon monoxide gas, carbon dioxide gas and mixtures thereof during the oxygen top-blowing or during both the oxygen top-blowing and the subsequent tapping.