Process for refining hot metal

US4604138A · kind A · utility

Assignee

• Thyssen Stahl AG · DE

Inventors

• Erich Hoffken · Dinslaken, DE
• Wolfram Florin · Dinslaken, DE
• Rudolf HAMMER · Dinslaken, DE

Key dates

• Filing date: Sep 11, 1985
• Grant date: Aug 5, 1986
• Expiry date: Sep 11, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21C5/32
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a process for producing steel of low phosphorus content from hot metal of usual phosphorus content, in which the hot metal is simultaneously decarburized and dephosphorized in a single process step in a metallurgical vessel, in particular in a converter. The refining gas consisting predominantly or completely of technically pure oxygen is top-blown into the melt, particularly from below. The vessel is charged with hot metal containing manganese in an amount of less than 0.2% by weight. Lime is then added and refining is carried out down to a final phosphorus content of 0.005% by weight or less in the steel at the end of blowing, without a change of slag.