Patent ID: 6125916
Filing Date: 2000-10-03
Classification: B22D

Abstract:
An apparatus for continuously casting steel slabs, comprising:a mould having two longitudinal sides comprising copper for holding liquid steel, the mould being adapted to hold a predetermined amount of liquid steel to form a top surface at a predetermined position in the mould;a plurality of cooling pipes each having an end disposed proximate to the mould, the ends of the cooling pipes collectively defining an ideal envelope surface;a feeding nozzle having an outlet end adapted to be submerged in the liquid steel in the mould;wherein the geometry of the nozzle and the mould as measured along a cross section taken along the top surface at the predetermined position satisfies the equation:0.9.ltoreq.((A1/S1)/(A2/S2)).ltoreq.1.1wherein:A1 is the area between the outlet end and the longitudinal sides bounded by two lines extending generally perpendicularly between the longitudinal sides of the mould and each intersecting one of two lateral ends of the outlet end;S1 is twice the length of one longitudinal side of the mould as measured between the two lines;A2 is the area enclosed by the mold not including A1 and not including the area of the outlet end;S2 is the entire perimeter of the mould less S1; andwherein a normal distance measured between the ideal envelope surface and a corresponding mould wall is generally constant.