Method for improving rapid continuous casting tundish change success rate

Abstract

The invention discloses a method for improving the rapid continuous casting tundish change success rate. The method comprises the following steps that firstly, the waiting time for which a steel ladlefully contains molten steel is 5-10 min, and the temperature that the steel ladle reaches a continuous casting platform is 1,590-1,600 DEG C; secondly, the work tundish molten steel pull rate is reduced by one gear at the interval of 20 s, and the pull rate of a continuous casting machine is reduced to 0.3 m / min within 8 min; thirdly, the work tundish liquid level is measured, and when work tundish pouring is stopped, a standby tundish car and a work tundish car conducting pouring are started towards the other side at the same time; fourthly, after the standby tundish car is driven to the pouring station, an infrared immersing type water gap is rapidly installed; fifthly, after preparation of the standby tundish car is finished and 10 tons of molten steel is poured, 150-200 kg of a covering agent is added into a standby tundish; sixthly, when the steel ladle pours 20 tons of molten steel into the standby tundish, the molten steel is injected into a crystallizer; and after the standbytundish starts pouring, the continuous casting pull rate starting operation is conducted. By means of the method, the rapid continuous casting tundish change time is shortened, the rapid continuous casting tundish change success rate is increased, the continuous casting machine operation rate is increased, the production cost is reduced, and the labor intensity of workers is relieved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting, in particular to a method for improving the success rate of quick replacement of continuous casting tundish. Background technique [0002] In order to reduce the cost and improve the operation rate of the continuous casting machine, when the tundish reaches the service life, it is necessary to perform a quick change operation of the tundish. When the tundish is changed quickly, the casting speed is stopped, and the casting slab is still in continuous spraying. In the cooling state, if the quick change time of the tundish is too long, it is very likely that the slab will harden due to excessive cooling and cause the slab to stagnate, interrupt production, and may even cause a frozen slab accident. At present, there are tundish quick change operations in the production process of continuous casting machines in steel plants, but there is no specific description for the con...

AI Technical Summary

Problems solved by technology

[0002] In order to reduce the cost and improve the operation rate of the continuous casting machine, when the tundish reaches the service life, it is necessary to perform a quick change operation of the tundish. When the tundish is changed quickly, the casting speed is stopped, and the casting slab is still in continuous spraying. In the cooling state, if the quick change time of the tundish is too long, it is very likely that the slab will harden due to excessive cooling and cause the slab to stagnate, interrupt production, and may even cause a frozen slab accident

At present, there are tundish quick change operations in the production process of continuous casting machines in steel plants, but there is no specific description for the control range of each operation