A New Method for Controlling the Billet Pulling Speed ​​of Continuous Casting Round Billet Machine

Abstract

The invention belongs to the technical field of alloy steel continuous casting, and specifically relates to a new method for controlling the casting speed of continuous casting round billets, which divides the method for controlling the casting speed of continuous casting billets into two stages. In the first stage, before the continuous casting slab is detached from the dummy head (about 10-30 minutes), the casting speed control of the slab is determined according to the actual superheat of the molten steel in the tundish. In the second stage, after the slab is detached from the dummy head, the actual casting speed of the slab should be determined according to the actual temperature of the slab surface in the straightening section, that is, adjusted according to the actual surface data of the slab at the straightening section The actual casting speed data of the slab makes the slab leave the dangerous temperature range of the theoretical brittle temperature range of 723°C-912°C as soon as possible, which greatly reduces the probability of cracks on the surface of the slab due to its own structural phase transformation. Tundish molten steel temperature. It is convenient to effectively improve or basically solve the phenomenon that the surface cracks of the billet surface of the arc-shaped large round billet continuous casting machine are prone to occur. On the premise of ensuring the quality of the billet, it can greatly improve the overall production efficiency of the continuous casting machine and further improve the yield of the billet. Better Improve the surface quality of large round continuous casting slabs.

Description

technical field [0001] The invention belongs to the technical field of alloy steel continuous casting, and in particular relates to a new method for controlling the casting speed of continuous casting round billets. Background technique [0002] At present, the continuous casting round billet machines of various sizes are running in various domestic iron and steel enterprises, and the basic production process technology guiding ideology principles adopted in the actual production process of continuous casting are: [0003] In the actual production process, generally the technical process planner subjectively determines or adjusts the continuous casting process in the entire continuous casting machine production process based on the degree of superheat of the molten steel in the tundish of the continuous casting machine and the technical experience accumulated in the previous production process. The only basis for the casting speed of the slab. Secondly, according to the cast...

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to solve the defects that the surface of the continuous casting slab, especially the large round billet of medium and high alloy steel is easy to crack, and the surface of the finished steel product after rolling is easy to produce various cracks of different shapes and lengths, and provides a A relatively new method of controlling the casting speed of the continuous casting round slab is more reasonable, which is convenient to effectively improve or basically solve the phenomenon of cracks on the surface of the arc continuous casting machine slab, and greatly improve the continuous casting process under the premise of ensuring the quality of the casting slab. Improve the overall production efficiency of the casting machine, further improve the slab yield, and better improve the surface quality of the continuous casting slab