Atmosphere protective cover for electric slag furnace and electric slag furnace smelting system

Abstract

The invention relates to an atmosphere protective cover for an electric slag furnace. The atmosphere protective cover comprises a shell, wherein the shell is provided with at least one electrode installation through hole; a cover plate of the shell is provided with at least one electrode blowing ring, the inner side of the electrode blowing ring is provided with a plurality of upwardly-oblique upper blowing holes which are uniformly distributed, a shell bottom plate is provided with a lower blowing ring, and the lower blowing ring is provided with a plurality of downwardly-oblique lower blowing holes; by adopting double layers of air routes, the upper blowing holes spray air to an electrode to form a conical air curtain, thereby playing a good sealing effect. The invention also relates toan electric slag furnace smelting system adopting the atmosphere protective cover. The electric slag furnace smelting system comprises a first rotating arm, a second rotating arm, a crystallizing device, a first electrode roasting apparatus and a second electrode roasting apparatus, and the atmosphere protective cover is arranged on the crystallizing device; the first rotating arm and the second rotating arm are separately used for clamping the electrode, and the first rotating arm and the second rotating arm work alternatively; and the smelting efficiency is high, and the quality of a steel ingot is good.

Description

technical field [0001] The invention relates to an atmosphere protection cover, in particular to an atmosphere protection cover for an electroslag furnace and an electroslag furnace smelting system, belonging to the technical field of electroslag remelting. Background technique [0002] The crystallizer of the double-arm electroslag furnace is open. During smelting in summer or rainy season, due to the high air humidity, the steel ingot will have porosity defects and the hydrogen content will increase. If the hydrogen content in the steel is higher than 3PPM, whitening may occur. point, leading to scrapping, or hydrogen embrittlement, which reduces the mechanical properties of the steel, and can only be treated by weight reduction or even scrapped in the later stage, resulting in huge losses. Therefore, gas protection measures should be taken during electroslag remelting. [0003] The atmosphere protection cover in the prior art is generally the atmosphere protection cover ...

AI Technical Summary

Problems solved by technology

[0003] The atmosphere protection cover in the prior art is generally the atmosphere protection cover used in small single-electrode electroslag furnaces. Although there are two layers of gas blowing rings, the upper layer of gas blowing rings is generally the upper gas blowing nozzle set horizontally, and the drying nozzle blown out horizontally. The air diffuses to the surroundings, and it is easy to form a vortex, bringing the external moist air into the crystallizer

[0004] In addition, small-scale single-phase atmosphere-protected electroslag furnaces can only smelt about 20 tons of steel ingots, while the existing three-phase electroslag furnaces can smelt more than 50 tons of steel ingots per furnace, but large-scale electroslag furnaces are generally open, Lack of a suitable atmosphere shield; especially in the double-arm three-phase electroslag furnace, the two arms work alternately, but since each arm grabs multiple electrodes, the electrode holes of the two arms are difficult to align

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