Secondary cooling method and device of high-speed small square billet or small round billet continuous casting machine

Abstract

The invention discloses a secondary cooling method and device of a high-speed small square billet or small round billet continuous casting machine. The method is concretely characterized in that a secondary cooling region is divided into a plurality of guide sections; a plurality of guide sections with the front ends connected with a crystallizer adopt closely arranged roller structures; the rest guide sections adopt single-roller support structures; then, the secondary cooling region is divided into a plurality of cooling sections; the plurality of cooling sections at the front end adopt water spraying nozzles for casting blank cooling, and the rest cooling sections adopt air mist spray nozzles for casting blank cooling. Through section division for corresponding arrangement, the casting blank secondary cooling technology is enabled to meet the requirement of high drawing speed; the problems of great bulging deformation, poor cooling intensity, poor cooling control precision, poor uniformity, high space region temperature returning and the like under the condition of high drawing speed are solved; particularly, the drawing speed is improved; meanwhile, the investment cost and the production operation cost of the continuous casting machine can also be obviously reduced; wide market and application prospects are realized.

Description

technical field [0001] The invention belongs to the field of metallurgical continuous casting, and in particular relates to a secondary cooling method and device for a high-speed billet or round billet continuous casting machine. Background technique [0002] In the field of metallurgy, the billet continuous casting machine is the most traditional conventional continuous casting machine, which provides raw materials for rolling wire bars, rebar and other construction steel, and its market share accounts for more than 30% of the continuous casting machines in the market. At present, the casting speed of billet continuous casting machines is generally not high. For 150mm×150mm square billet continuous casting, most of the casting speeds are between 2.0 and 3.5m / min. The number of streams per unit is large, and the production and operation cost per ton of steel high. However, increasing the casting speed of the billet continuous casting machine can reduce the flow rate of the ...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a high-speed billet or round billet continuous casting machine secondary cooling method and device, which can effectively control and solve the problem of bulging deformation and cooling intensity of the billet under high casting speed. Insufficient, poor uniformity, short length of air cooling zone, etc.

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