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

Abstract

A device and method for preparing electroslag remelted steel ingots with a tubular electrode and a consumable stirrer. The device includes the crystallizer body of the electroslag remelting system, a conductive cross arm, a lifting cross arm, a consumable stirrer electronic control device, Electrode control device, bottom water tank, tubular electrode and consumable stirrer; the tubular electrode is a consumable electrode made of large-diameter thick-walled pipe, and a tubular dummy electrode with the same structure as the tubular electrode is welded to the top of the tubular electrode. The consumable stirrer is located in the tubular electrode, and the material of the stirrer is the same as the material of the final electroslag remelted steel ingot. The use of a tubular structure allows the current to be evenly distributed on the consumable electrode tip, thereby generating heat when the current is introduced into the slag with a large resistance value. The heat source in the slag pool is more evenly distributed, while the droplets generated by the tubular electrode are small and Uniform distribution facilitates the refining process. The agitator's own consumption is equivalent to increasing its melting speed. By stirring the liquid metal molten pool, it accelerates the cooling of the steel ingot and suppresses the segregation of the steel ingot.

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.

Images