A preparation method of consumable electrode for electroslag remelting

Abstract

The invention discloses a preparation method of a consumable electrode for electroslag remelting, and belongs to the technical field of alloy processing. The preparation method comprises the steps that a steel ingot is loaded into a resistance furnace after being demoulded, firstly, isothermal preheating is carried out, slow heating is carried out, then, rapid cooling is carried out, and slow cooling is carried out. According to the preparation method, the consumable electrode for an electro-slag furnace does not crack during the preparation process, the phenomenon that the electrode chips andcracks during the electroslag remelting process is effectively avoided, production efficiency is improved, and production cost is reduced.

Description

technical field [0001] The invention relates to a consumable electrode, in particular to a method for preparing a consumable electrode for electroslag remelting, and belongs to the technical field of alloy processing. Background technique [0002] Electroslag remelting is the main method to prepare high-quality large alloy ingots, and the diameter of the consumable electrode required for large alloy ingots is also larger. [0003] High-speed steel is a high-carbon, high-alloy special steel, which is used in cold rolling rolls because of its high hardness, high wear resistance and high heat resistance. Before the end of the 1980s, forged high-speed steel rolls had been used to manufacture work rolls and intermediate rolls of multi-roll mills, and the roll specifications were smaller. In the process of preparing large-scale high-speed steel by electroslag remelting, due to the high alloy content, the tendency of alloy segregation and cracks will increase significantly with th...

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Problems solved by technology

In the process of preparing large-scale high-speed steel by electroslag remelting, due to the high alloy content, the tendency of alloy segregation and cracks will increase significantly with the increase of product specifications; High-speed steel is prone to cracking during the production process due to thermal stress, structural transformation stress during heating or cooling, and uneven carbides. These quality problems seriously restrict the development of high-speed steel production.

[0004] Patent document CN203316707U proposes a new type of electroslag remelting consumable electrode, using two or more hollow tubular structure consumable electrodes welded and fixed below the fixed electrodes, but the preparation process of hollow tubular structure consumable electrodes Complicated, difficult, and costly, and segregation still cannot be eliminated in the preparation process

[0005] Patent document CN104372177B mentions a large-scale alloy ingot electroslag remelting tube-type consumable electrode, which adopts several columnar consumable electrodes with the same size and solid structure to be fixedly connected to the bottom surface of the electrode group collector. The fixed electrodes are fixedly connected. Although the large-scale consumable electrodes are replaced by multiple small-scale consumable electrodes, the combined effect of the small-scale consumable electrodes is not exactly the same as that of the large-scale consumable electrodes. There are still problems such as segregation and cracks in the preparation process, and the problems of cracking and falling of consumable electrodes during the preparation process cannot be well solved.

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