Patent ID: 6316106
Filing Date: 2001-11-13
Classification: B22D,Y10T

Abstract:
A filler sand for a ladle tap hole valve comprising 70 to 90 wt % of chromite sand and 10 to 30 wt % of silica sand, said filler sand being blended externally with 0.05 to 5 wt % of carbon black calculated on a total amount of the chromite said and the silica sand, wherein 95% or more of the chromite sand consists of particles having particle diameters within a range of 150 to 850 .mu.m, 60% or more of the chromite sand consists of particles having particle diameters within a range of 200 to 425 .mu.m, 95% or more of the silica sand consists of particles having particle diameters within a range of 200 to 850 .mu.m, and 60% or more of the silica sand consists of particles having particle diameters within a range of 300 to 600 .mu.m.