Patent ID: 6223806
Filing Date: 2001-05-01
Classification: B22C

Abstract:
An apparatus for bottom casting of a molten steel, comprising a pouring pipe, a stool, at least one mold, and at least one runner, each runner being disposed in the stool and connecting between the pouring pipe and each mold, wherein the runner satisfies the following equations (1) and (2), and a gap formed between a side wall of a groove for a runner provided in the stool and a runner brick is filled with heat resisting granules,A-D.ltoreq.D(Z/100)+2.5 (mm) (1)A-D>B-E>0 (2)where A is an upper portion width (mm) of the groove, B is a bottom portion width (mm) of the groove, D is an upper portion width (mm) of the runner brick, E is a lower portion width (mm) of the runner brick, and Z is a mean coefficient (%) of linear expansion of the runner brick in the temperature range of a room temperature to 1000.degree. C.