Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB14089/59A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arbed SAfiledCriticalArbed SA
Publication of GB874379ApublicationCriticalpatent/GB874379A/en
C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
C21C5/28—Manufacture of steel in the converter
C21C5/30—Regulating or controlling the blowing
C21C5/32—Blowing from above
Abstract
Steel is refined by surface blowing oxygen from a lance, the melt being stirred when oxygen blowing is stopped for intermediate or final deslagging by blowing a gas containing less than 35% oxygen into the melt. The oxygen may be loaded with dephosphorizing agents, as may the gas, which can be nitrogen, argon, carbon monoxide, air or air enriched with oxygen with or without steam and/or carbon dioxide. Blowing the gas may take 1-4 minutes, the lance used for blowing oxygen being suitable therefor. The process is applicable to rotary furnaces and to conventional bottom blown converters. The feed of dephosphorizing material in the oxygen may be increased during the 2-3 minutes immediately before the cessation of oxygen blowing.
GB14089/59A1958-04-281959-04-24Improvements relating to the manufacture of steel
ExpiredGB874379A
(en)