Device and method for preparing large-size homogeneous steel ingot by stirring with self-consuming stirrer

Abstract

The invention discloses a device and method for preparing a large-size homogeneous steel ingot by stirring with a self-consuming stirrer. The device comprises a steel ingot mould, a chassis, a self-consuming stirrer, a lifting cross arm, an electric control device and a heat-insulating riser, wherein the lifting cross arm is connected with an upright rod which is arranged on one side of an operating platform, the electric control device is fixed on the lifting cross arm and connected with the self-consuming stirrer, the heat-insulating riser is arranged above the steel ingot mould, the self-consuming stirrer comprises a stirring shaft and stirring blades, the self-consuming stirrer consumes continuously during the stirring process, one end of the lifting cross arm is a sliding end, and the sliding end can move up and down along the upright rod. The self-consuming stirrer as a cold source can increase the cooling and heat-transfer speed of the steel ingot and shorten the curing time of the steel ingot. The self-consuming stirrer consumes itself to be melted during the stirring process, so as to eliminate the problems of loosening and the like. By virtue of the rotation of the stirrer, the primary tree-like crystals at the solidified front are broken and enter the molten body to generate new crystal nuclei, so as to enhance the organization compactness and suppress segregation of metal element components.

Description

technical field [0001] The invention relates to the technical field of large-scale steel ingot solidification technology in the foundry industry, in particular to a device and method for preparing a large-scale homogeneous steel ingot by stirring with a 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. The solidification process of large steel ingots is very long, ranging from tens of hours to hundreds of hours depending on the tonnage of the steel ingots. , such as the influence of hot solute convection, etc., make the chemical c...

AI Technical Summary

Problems solved by technology

Although some progress has been made in the formation mechanism of segregation, such as the determination of segregation type and segregation location, the progress in segregation control measures is slow, and there is almost no effective measure to suppress macro-segregation.

For decades, in the production of large steel ingots, the factory has adopted the method of allowing it to cool naturally, and only when the ingot body is completely solidified and the riser is not completely solidified, the method of removing the insulation riser is used to increase productivity. This method can only be used A few hours in advance, compared with dozens or even hundreds of hours of solidification time of large steel ingots, the effect is limited

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