A production process for continuous casting of ultra-high manganese steel

Abstract

The invention belongs to the technical field of metallurgy continuous casting and particularly relates to an extra-high manganese steel continuous casting production technology. The extra-high manganese steel continuous casting production technology is characterized by comprising cooling a reduced casting-time first-tank steel liquid in a tundish, cooling the reduced casting-time first-tank steel liquid in a crystallizer and preventing a shell inside the crystallizer from being broken, wherein for the cooling of the reduced casting-time first-tank steel liquid in the tundish, in the tundish baking stage, coal gas, air and combustion-supporting oxygen are used for improving the coal gas combustion efficiency; for the cooling of the reduced casting-time first-tank steel liquid in the crystallizer, the flow of cooling water in the crystallizer is controlled to be within 200-260m<3> / h in the casting starting stage; and for the prevention of the shell inside the crystallizer from being broken, the thickness of the shell in the casting starting stage is increased, and the pulling rate variation amplitude in the casting starting stage is reduced. Compared with the prior art, the technology has the advantages that the smooth casting starting of the high-alloy steel grade comprising about 0.60% of the carbon content and about 20% of the manganese content is achieved.

Description

technical field [0001] The invention belongs to the field of metallurgical continuous casting technology, in particular to a production technology of ultra-high manganese steel continuous casting. Background technique [0002] With the higher requirements of the automobile industry for the production efficiency of special parts, iron and steel enterprises continue to develop steel products suitable for improving the first pass rate of automobile stamping forming. Therefore, the content of alloying elements such as manganese in steel continues to increase, reaching a certain critical value Finally, the continuous casting process could not adapt to the requirements of steel grades, and was forced to adopt die casting production, which had problems such as low production efficiency, reduced surface and internal quality, and high production costs. [0003] When the manganese content of the continuous casting machine is as high as 20% and the carbon content is 0.60%, steel breako...

AI Technical Summary

Problems solved by technology

[0002] With the higher requirements of the automobile industry for the production efficiency of special parts, iron and steel enterprises continue to develop steel products suitable for improving the first pass rate of automobile stamping forming. Therefore, the content of alloying elements such as manganese in steel continues to increase, reaching a certain critical value Finally, the continuous casting process could not adapt to the requirements of steel grades, and was forced to adopt die casting production, and die casting production had problems such as low production efficiency, reduced surface and internal quality, and high production costs.

[0003] When the manganese content of the continuous casting machine is as high as 20% and the carbon content is 0.60%, steel breakout is very likely to occur during the continuous casting and pouring process. The main reasons for the steel breakout accident are: A. During the pouring process of the liquid in the tundish and the mold, the temperature of the molten steel drops greatly, resulting in a low temperature of the billet shell formed in the mold during the pouring stage, a decrease in the strain resistance, and it is easy to break

B. The characteristics of steel types (high carbon, high manganese) reduce the plasticity at low temperature, and it is easy to break during the pouring process, and the problem of steel breakout occurs