Combined elongated upper nozzle and manufacturing method for same

Abstract

The invention provides a combined elongated upper nozzle and a manufacturing method for the same. The combined prolonged upper nozzle comprises an aluminum-carbon main body. The outer shape of the aluminum-carbon main body is an annular closed body consisting of a curved surface. A zirconium-carbon heat-resisting core body is arranged in an inner cavity of the aluminum-carbon main body. A through hole is reserved on the middle part of the zirconium-carbon heat-resisting core body. The upper part of the zirconium-carbon heat-resisting core body is thicker than the middle lower part of the zirconium-carbon heat-resisting core body. The inner wall of the inner cavity of the aluminum-carbon main body closely contacts with the outer wall of the zirconium-carbon heat-resisting core body. The upper part of the zirconium-carbon heat-resisting core body partially covers the upper end face of the aluminum-carbon main body. The part, which is away from the centerline of the through hole, of the upper end of the zirconium-carbon heat-resisting core body is an annular planar body. The part, which is downwards extended to the upper end of a cylinder on the middle lower part of the zirconium-carbon heat-resisting core body, of the inner end of the annular planar body is a cone. The part, which is connected with the inner cavity wall of the aluminum-carbon main body, of the outer wall of the upper part of the zirconium-carbon heat-resisting core body is stepped. The shortcomings of the prior art are overcome.

Description

technical field [0001] The invention relates to an extended upper nozzle of a tundish, which is a composite extended upper nozzle and a manufacturing method thereof. Background technique [0002] The structure of the existing composite upper nozzle is generally composed of three parts, namely: the matrix, the zirconium core and the zirconium bowl, and the parts are bonded and fixed by an adhesive layer. The shortcoming of the composite upper nozzle of this structure is: because the upper nozzle is in direct contact with the molten steel during use, the binder is easily dissolved at the high temperature of the molten steel, so that the connection parts of each component are prone to steel leakage. Therefore, this The general service life of the seed nozzle is about 12 hours, which brings great waste to the enterprise and keeps the production cost high; at the same time, because the structure of the upper nozzle needs to be composed of three parts, the manufacturing process is...

AI Technical Summary

Problems solved by technology

The shortcoming of the composite upper nozzle of this structure is: because the upper nozzle is in direct contact with the molten steel during use, the binder is easily dissolved at the high temperature of the molten steel, so that the connection parts of each component are prone to steel leakage. Therefore, this The general service life of the seed nozzle is about 12 hours, which brings a lot of waste to the enterprise and keeps the production cost high; at the same time, because the structure of the upper nozzle needs to be composed of three parts, the manufacturing process is complicated and the manufacturing cost is high. , the production qualification rate of the product is low

Images