Development of Optimum Argon Shrouding System between Ladle and Tundish
2005 Volume 91 Issue 10 Pages 763-768
Details
2005 Volume 91 Issue 10 Pages 763-768
Experimental investigation has been carried out using three kinds of pouring tubes to establish an optimal Ar gas seal technology for the continuous casting tundish. The following findings are obtained.
(1) The Ar gas seal effect in the pouring tube is dependent on the Ar gas flow rate and the distance between the Ar gas blow position and molten steel surface.
(2) The performance of the seal of the pouring tube during ladle exchange is evaluated by the pressure of nitrogen, PN2.
(3) When newly developed pouring tube of type-C is used in place of the conventional tube of Type-A, the number of inclusions in the slab, of which diameters are equal to or more than 120μm, is reduced by about 50% at the steady parts and by about 40% at the ladle exchange parts.
(4) The deposit thickness on the tube wall of Type-C decreases to 1/3 of the thickness for Type-A. Accordingly, the pouring tube of Type-C can be reused.
