Method for controlling secondary cooling water spraying width during continuous casting of plate blank

Abstract

The invention discloses a method for controlling secondary cooling water spraying width during continuous casting of a plate blank, which comprises the following steps: firstly, setting a plurality of secondary cooling sections in front of a straightening region of the plate blank; secondly, establishing a two-dimensional solidification and heat transfer simulation model of the plate blank through a computer; thirdly, utilizing the two-dimensional solidification and heat transfer simulation model to adjust the lectotype and the arrangement of a spray nozzle at the middle part of the wide surface of the plate blank; fourthly, determining the reasonable lectotype and the arrangement of the spray nozzles at the side parts by processing through the computer; fifthly utilizing the simulation model to determine the temperature distribution of the plate blanks with various width specifications through calculation; and sixthly, utilizing the model to calculate the flow rate of cooling water of a loop of the spray nozzle loop at the side part, which is arranged in an open state, and implementing the strategic cooling according to the calculated flow rate of the cooling water so as to enable the temperature on the surface of the plate blank to be uniform and prevent the corner part from being super-cooled. In the method, the simulation model is utilized for calculating the result, the situation of enabling the temperature at the side or corner part of the plate blank in the straightening region to be kept away from a brittleness temperature range is taken as the target, and the open / close state of each spray nozzle loop at the side part can be accurately determined, thereby enabling the control of the secondary cooling water spraying width to be more accurate, preventing the corner part of the plate blank from being super-cooled and avoiding the generation of cracks.

Description

technical field [0001] The invention relates to the field of continuous casting of iron and steel materials and other metal materials used in metallurgical processes, in particular to a method for controlling the width of secondary cooling water spray. Suitable for continuous casting of slabs with bending and straightening of all types of metal materials. Background technique [0002] In the production process of continuous casting slabs, it is necessary to spray water on the surface of the slab or to spray compressed air and water to perform secondary cooling on the slab, which is the so-called "secondary cooling". Because the corners of the slab are in two-dimensional heat transfer, the cooling is faster, and the heat exchange between the cooling water and the slab is complicated, it is difficult to ensure the uniformity of the temperature in the transverse direction of the slab, and the temperature at the corners of the slab is generally low. At the temperature of the wi...

AI Technical Summary

Problems solved by technology

[0003] The main solution at present is to use an adjustment system that allows the side nozzle circuit to be "opened" or "closed" individually, but so far there is no theoretical method to guide under what circumstances the side nozzle circuit should be "open" or "closed". "off" state, and how much cooling water flow should be in the nozzle circuit in the "on" state, which can only be determined by human experience

Images