Variable water ratio control method of secondary cooling of billet caster

Abstract

The invention discloses a variable water ratio control method of the secondary cooling of a billet caster which can reduce the inner crack rate of casting blanks. The control method can realize that the water flow rate delta and the total amount of water Q increase by stages with the increasing of the casting speed V of casting blanks, namely when the casting speed V of casting blanks is 0-2m / min,the water flow rate delta is 1.35-1.39L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 13.8-14.3V; when the casting speed V of casting blanks is 2-2.4m / min, the water flow rate delta is 1.58-1.64L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 16.2-16.8V; when the casting speed V of casting blanks is 2.4-2.8m / min, the water flow rate delta is 1.67-1.71L / kg, the functional relationship between the secondary cooling totalamount of water Q and the casting speed V of casting blanks is Q = 17.1-17.5V; when the casting speed V of casting blanks is 2.8-3.0m / min, the water flow rate delta is 1.73-1.76L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 17.7-18.1V; and when the casting speed V of casting blanks is 3.0-3.6m / min, the waterflow rate delta is 1.8-1.86L / kg, the functional relationship between the secondary cooling total amount of water Q and the casting speed V of casting blanks is Q = 18.5-19.1V.

Description

technical field [0001] The invention relates to a control method for continuous casting cooling of billets, in particular to a method for controlling variable ratio water volume for secondary cooling of billet continuous casting machines. Background technique [0002] In the continuous casting process, most of the internal quality problems of the continuous casting slab are closely related to the secondary cooling. The secondary cooling technology is the key technology of continuous casting. Good secondary cooling control is the key to avoid or reduce the internal defects of the continuous casting slab links. [0003] The cooling intensity of the secondary cooling is generally expressed by the specific water volume, which is the ratio of the cooling water consumed per unit time to the weight of the slab passing through the secondary cooling zone. [0004] At present, the control method of secondary cooling water is generally automatic water distribution control, and the adj...

AI Technical Summary

Problems solved by technology

In the test process of continuing to reduce the specific water volume, when casting at high casting speed (greater than 3m / min), steel leakage often occurs in the post-secondary cooling section (before the air-cooling section and the tension leveler) or at the tension leveler, causing damage to production and equipment. had a great impact

Therefore, the high-speed casting of the continuous casting machine is greatly restricted

[0006] It can be seen from this that the disadvantage of constant specific water volume control is that increasing the specific water volume of the secondary cooling can meet the requirements of high casting speed, but the internal cracking rate of the slab is high; reducing the specific water volume can reduce the internal cracking rate of the slab. However, high-speed casting is limited

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