A non-uniform cooling slab crystallizer

Abstract

The invention discloses a non-uniform cooling slab crystallizer, comprising a copper plate, the copper plate includes a first area, a second area and a third area, bolt holes are evenly opened on the front surface of the copper plate, two adjacent The distance between the bolt holes 5 is 80-250mm, the number of vertically arranged bolt holes is 6-12, and the front surface of the copper plate is evenly provided with thermocouple holes, and the thermocouple holes are connected with the bolt holes. The holes are on the same vertical horizontal line, the front surface of the copper plate is evenly provided with cooling water grooves, 3-8 cooling water grooves are distributed between two adjacent bolt holes, and the cooling water grooves on the side close to the bolt holes The depth of the cooling water tank is 12-18mm, the depth of the other cooling water tanks is 8-14mm, and the width of the cooling water tank is 5-12mm; according to the solidification characteristics of different steel types in the crystallizer, the water volume of the mold in different regions can be dynamically and flexibly adjusted. It not only guarantees the safe thickness of the cast slab shell, but also reduces the occurrence of slab cracks and even steel breakout accidents.

Description

technical field [0001] The invention belongs to the technical field of continuous steel casting in the metallurgical industry, and in particular relates to a non-uniform cooling slab crystallizer. Background technique [0002] With the development of continuous casting technology, slab continuous casting production lines continue to develop high-quality steel grades. At the same time, in order to increase the output of iron and steel enterprises, all major iron and steel enterprises have set the goal of increasing the casting speed of slab continuous casting machines. Due to the different solidification characteristics of different steel types, it is necessary to match different continuous casting process parameters to ensure smooth production and billet quality. When slab continuous casting produces peritectic and sub-peritectic steel and other steel types, peritectic reaction occurs in the crystallizer, and the billet shell shrinks a lot during the solidification process,...

AI Technical Summary

Problems solved by technology

When slab continuous casting produces peritectic and sub-peritectic steel and other steel types, peritectic reaction occurs in the crystallizer, and the billet shell shrinks a lot during the solidification process, resulting in uneven heat flow distribution in the mold and serious uneven thickness of the billet shell , there will be stress concentration at the junction of thickness and thickness, coupled with the low high temperature strength of the primary slab shell, it is easy to produce slab cracks, and serious steel breakout accidents will occur

The use of mold weak cooling technology is an effective way to reduce the heat flow in the mold meniscus area, but the use of weak cooling method will reduce the thickness of the shell of the mold, and the shell is too thin to easily cause steel breakout accidents. Some enterprises want to achieve weak cooling of the mold , developed a hot-top crystallizer, which has a significant effect on improving heat transfer

[0003] Mold hot top technology includes three methods: The first method is to carve longitudinal grooves on the inner surface of the mold. This method has a short mold life and is prone to steel hanging accidents

The second method is to spray an alloy with low thermal conductivity on the inner wall of the water tank in the meniscus area of ​​the crystallizer to increase the thermal resistance. This method is difficult to operate, and the coating is easy to fall off, which affects the life of the crystallizer.

The third method is to inlay low thermal conductivity materials in the meniscus area of ​​the crystallizer, but the coating is easy to fall off, reducing the life of the crystallizer

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