Device and method for producing large homogeneous electro-slag re-melting steel ingots added with consumable stirrer

Abstract

The invention discloses a consumable stirrer added device and method for producing large homogeneous electro-slag re-melting steel ingots. The device comprises a crystallizer, consumable electrodes, a cooling water circulation system, a lifting cross arm, an electronic control unit, a consumable electrode control unit and a consumable stirrer. The consumable stirrer comprises a stirring shaft and stirring blades which are fixedly connected onto the stirring shaft, and materials of the stirrer are identical to materials of the finally produced large homogeneous electro-slag re-melting steel ingot finished products. The stirring shaft is connected with an output shaft of a speed reducer through a coupling unit, the stirring blades are in sheet structures which thicken from the tops of the blades to the roots of the blades, the stirring blades are fixedly connected onto the stirring shaft in a single-layer multi-sheet mode, and the consumable stirring is controlled by the lifting cross arm to enter and exit the crystallizer. According to the device and the method, rotary flow of molten steel of the steel ingot solidification front is driven by the rotation of the consumable stirrer, so that primary dendrites of the solidification front are fractured to enter melts to form novel crystal nucleuses, the structure compactness is enhanced, and segregation of metal elements are restrained.

Description

technical field [0001] The invention relates to the technical field of solidification technology for large electroslag remelted steel ingots in the metallurgical industry, and in particular to a device and method for preparing large homogeneous electroslag remelted steel ingots with an additional consumable stirrer. Background technique [0002] In recent years, with the rapid development of the electric power industry, nuclear industry and petrochemical industry, the demand for large castings and forgings is increasing, and the quality requirements for large castings and forgings are also getting higher and higher. Large steel ingots are the early products of large castings and forgings, and their quality is particularly important for improving the quality of large castings and forgings. In the electroslag remelting crystallizer, the solidification process of the steel ingot is a typical directional solidification process, that is, it has the heat transfer characteristics o...

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 other defects

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