Global Patent Index - EP 0347351 A1

EP 0347351 A1 19891220 - Process for treating molten steels by the injection of gas through the bottom of the ladle.

Title (en)

Process for treating molten steels by the injection of gas through the bottom of the ladle.

Title (de)

Verfahren zur Behandlung von flüssigen Stählen durch Einblasen von Gas durch den Pfannenboden.

Title (fr)

Procédé de traitement des aciers liquides par injection de gaz à travers le fond de poche.

Publication

EP 0347351 A1 19891220 (FR)

Application

EP 89420220 A 19890615

Priority

FR 8808479 A 19880617

Abstract (en)

The process relates to the treatment of liquid steels in a ladle by the injection of gas through the bottom of the ladle. <??>It consists in injecting at least one inert gas from locations distributed in the bottom of the ladle (3) so as to form on the surface of the liquid steel and annular swelling (14) whose outer edge (18) is close to the inner edge (16) of the ladle (1) wall lining. <??>An oxidising gas may be mixed with the inert gas for decarbonising. The process is applied in particular to the treatment of carbon steels. <IMAGE>

IPC 1-7

B22D 1/00; C21C 7/072; C22B 9/05

IPC 8 full level

B22D 1/00 (2006.01); C21C 7/00 (2006.01); C21C 7/072 (2006.01); C22B 9/05 (2006.01)

CPC (source: EP US)

B22D 1/00 (2013.01 - EP US); C21C 7/072 (2013.01 - EP US); C22B 9/05 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT BE DE ES GB IT LU NL SE

DOCDB simple family (publication)

EP 0347351 A1 19891220; EP 0347351 B1 19920729; AT E78876 T1 19920815; DE 68902283 D1 19920903; DE 68902283 T2 19930311; ES 2034727 T3 19930401; FR 2632971 A1 19891222; FR 2632971 B1 19930903; JP H0285315 A 19900326; JP H0420965 B2 19920407; US 4957542 A 19900918

DOCDB simple family (application)

EP 89420220 A 19890615; AT 89420220 T 19890615; DE 68902283 T 19890615; ES 89420220 T 19890615; FR 8808479 A 19880617; JP 15354489 A 19890615; US 36650189 A 19890615