Device and method for preparing electroslag remelted steel ingot with tubular electrode attached to consumable stirrer

Abstract

The invention discloses a device and a method for preparing an electroslag remelting ingot employing a tubular electrode additional consumable blender. The device comprises a crystallizer body of an electroslag remelting system, a conductive cross arm, a lifting cross arm, a consumable blender electric control gear, an electrode control device, a bottom water tank, the tubular electrode and a consumable blender, wherein the tubular electrode is a consumable electrode and adopts a large-caliber and thick-wall tubular product; a tubular false electrode with the same structure as the tubular electrode is welded on the top of the tubular electrode; the consumable blender is arranged inside the tubular electrode; the material of the blender is the same as that of the finally prepared electroslag remelting ingot product. Current can be evenly distributed on the tip of the consumable electrode by adopting a tubular structure, so that heat is generated when the current is led to slag with the maximal resistance value; a heat source in a slag bath is more evenly distributed while liquid drops generated by the tubular electrode are small and evenly distributed, so that the refining process is facilitated. The consumption of the blender is equivalent to the increased melting rate; cooling of the steel ingot is accelerated by stirring a liquid metal liquid bath; segregation of the steel ingot is restrained.

Description

technical field [0001] The invention relates to the technical field of solidification technology for large-scale electroslag remelting steel ingots in the metallurgical industry, in particular to a device and method for preparing electroslag remelting steel ingots with a tubular electrode attached to a consumable stirrer. Background technique [0002] In recent years, with the rapid development of electric power industry, nuclear industry and petrochemical industry, the demand for large homogeneous steel ingots with high added value is increasing day by day. In the electroslag remelting process, the solidification process of the steel ingot is a typical directional solidification process, that is, it has the heat transfer characteristics of one side heating and one side cooling. This directional solidification structure can basically eliminate the segregation and shrinkage of the electroslag remelting steel ingot. Loose and other defects. However, the solidification process...

AI Technical Summary

Problems solved by technology

Although domestic and foreign metallurgical fields have recently made some progress in the formation mechanism of segregation, such as the determination of segregation types and segregation locations, the progress in segregation control measures has been slow, and there are almost no effective measures to suppress or eliminate macro segregation inside large steel ingots. shrinkage and porosity; the large-diameter electrodes used in traditional large-scale electroslag remelting are rod-shaped, with protruding electrode ends and large droplets, resulting in unclean removal of impurities and harmful substances contained in the droplets when they pass through the slag pool , reducing the refining effect and directly affecting the quality of large steel ingots

At the same time, due to the uneven heat generated by this rod-shaped large-diameter electrode, the local temperature is too high to form a high degree of superheat, which affects the melting efficiency of the electrode.

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