EP 0140001 B1 19880420 - PROCESS AND DEVICE FOR THE PRODUCTION OF STEEL HAVING AN ELEVATED DEGREE OF PURITY AND A REDUCED GAS CONTENT
Title (en)
PROCESS AND DEVICE FOR THE PRODUCTION OF STEEL HAVING AN ELEVATED DEGREE OF PURITY AND A REDUCED GAS CONTENT
Publication
Application
Priority
- DE 3331710 A 19830902
- DE 3347718 A 19831231
Abstract (en)
[origin: US4544405A] A method for producing steels of high purity and low gas content in steel mills and steel foundries comprises melting the steel with the desired alloying components in a ladle, directing an inert gas and oxygen mixture to the ladle with the molten steel to decarburize the steel in at least one phase, and carrying out decarburization, deoxidation and fining in separate operational steps without disturbing the coherence of the entire process cycle. The apparatus for carrying out the method includes a converter for the decarburization of the steel in several phases permitting successively a treatment with an air inert gas oxygen mixture and pure inert gas in gas amounts greatly varying from each other. In addition, a ladle is required for fine-flushing the steel succeeding the converter. The converter mouth advantageously has a mechanism permitting temporary reduction of the converter opening area. The converter also has a gas volume control and injection holes permitting a variation of the different gases to be injected. Injection holes are advantageously provided with individual controls. A ladle for the finished melt is lined with basic or neutral refractory materials so that the ladle lining can furnish no oxygen to the melt. A tapping ladle for the finished melt is advantageously lined with dolomite.
IPC 1-7
IPC 8 full level
C21C 5/00 (2006.01); C21C 7/068 (2006.01); C21C 7/072 (2006.01)
CPC (source: EP US)
C21C 5/005 (2013.01 - EP US); C21C 7/0685 (2013.01 - EP US); C21C 7/072 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE DE FR IT SE
DOCDB simple family (publication)
EP 0140001 A1 19850508; EP 0140001 B1 19880420; CA 1231533 A 19880119; DE 3347718 A1 19850328; DE 3347718 C2 19860528; DE 3470565 D1 19880526; US 4544405 A 19851001
DOCDB simple family (application)
EP 84110166 A 19840825; CA 462229 A 19840831; DE 3347718 A 19831231; DE 3470565 T 19840825; US 64702484 A 19840904