Method of decarburizing refining molten steel containing Cr

Details Method of decarburizing refining molten steel containing Cr Method of decarburizing refining molten steel containing Cr

1996-12-12

1998-04-28

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75540, 75546, 75551, 75552, C21C 535

Patent

active

057439389

ABSTRACT:
A method of decarburizing refining molten steel containing Cr in such a manner that oxygen gas, inert gas or a mixture of inert gas and oxygen gas is blown to the surface of bath of molten steel containing Cr in a refining chamber and to a position below the surface of the steel bath. Inert gas is blown to the surface of the steel bath, and oxygen gas, the inert gas or a mixture of oxygen gas and inert gas is blown below the surface of the steel bath in a portion of or all of an overall period in which the concentration of C in the molten steel is in a range of 1 wt % and 0.05 wt %. Slag and molten steel are stirred so as to cause Cr.sub.2 O.sub.3 in the slag and C in the molten steel to positively take part in a reaction represented by expression (1) below:

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