Novel method for controlling casting blank pull rate of round continuous casting machine

Abstract

The invention belongs to the technical field of alloy steel continuous casting and particularly relates to a novel method for controlling casting blank pull rate of a round continuous casting machine. The method for controlling the casting blank pull rate includes two stages. Stage one, before a continuous casting blank is released from a dummy bar head (about 10-30 minutes), the pull rate of the casting blank is set according to a traditional method that the pull rate is set according to actual degree of superheat of middle bag molten steel. Stage two, after the casting blank is released from the dummy bar head, the actual pull rate of the casting blank is determined according to the actual temperature of the casting blank surface of the casting blank in a straightening section, namely actual pull rate data of the casting blank is adjusted according to surface actual data of the casting blank at the straightening section position, the casting blank is released from a dangerous temperature range of 723-912 DEG C of a theoretical brittleness temperature range as soon as possible, possibility of cracks on the casting blank surface due to casting blank self texture phase change is greatly reduced, and the middle bag molten steel temperature is also considered. By means of the method, the phenomenon that cracks are prone to occur on a billet surface of an arc large round continuous casting machine is effectively reduced or basically avoided, under the premise that the casting blank quality is guaranteed, the whole production efficiency of the continuous casting machine is greatly improved, casting blank yield is further improved, and large round continuous casting blank surface quality is well improved.

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