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. 15, 1980
Filed:
Nov. 28, 1977
Hiroyuki Katayama, Munakata, JP;
Makoto Inatomi, Kitakyushu, JP;
Hiroyuki Kajioka, Kitakyushu, JP;
Yasushi Nakamura, Tokyo, JP;
Michihisa Ito, Tokyo, JP;
Kazuumi Harashima, Kawasaki, JP;
Takamasa Ohno, Hikari, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
A carbon-unsaturated molten metal or molten alloy containing elements more oxidizable than iron such as chromium and silicon is dephosphorized by addition of a flux composition comprising calcium carbide and a halide of alkali earth metal such as calcium fluoride in a non-oxidizing atmosphere, and thereafter the slag as a by-product is stabilized against formation of undesirable gases. This method when employed in refining ferrochromium or crude stainless steel makes feasible dephosphorization, and it is particularly suited for economical production of low phosphorus stainless steel.