Bonded breakout during continuous castingIn the continuous casting process, bonding will cause the reconnection of the billet, leaving messy stick marks and re
Bonded breakout during continuous casting
In the continuous casting process, bonding will cause the reconnection of the billet, leaving messy stick marks and reducing the quality of the surface. If there is a cohesive breakout, it will seriously affect the safety of production, but fortunately, many manufacturers are currently studying methods to deal with it.
The billet crystallizer manufacturer introduced that the bonded breakout is the main form of breakout in the continuous casting production process. According to statistics, the bonded breakout accounts for more than 50% of the many breakouts. The so-called adhesion is caused by the fluctuation of the liquid level, there is no liquid slag between the solidified shell of the meniscus and the copper plate, and adhesion occurs in severe cases. When the billet is drawn, the frictional resistance increases, the bond is broken, and expands downward and on both sides, forming a V-shaped rupture line, and breakout occurs when it reaches the exit.
Bonding breakout occurs in the following situations:
1. The incidence of breakout in the wide surface of the inner arc is higher than that of the wide surface of the outer arc (approximately 3:1), and the adhesion breakout is more likely to occur near the middle of the wide surface (about 300mm around the nozzle).
2. Large-section slabs are prone to breakout in the middle of the wide face, while small sections occur in the area close to the narrow face.
3. Aluminum-killed steel has a higher rate of breakout than aluminum-silicon killed steel. The mold slag consumption is below 0.25kg/t steel, and the probability of breakout increases.
In the casting process, the countermeasures to prevent the bond breakout are: monitor the use of the mold powder to ensure that the mold powder has good performance. For example, the thickness of the liquid slag layer of the measuring mold is always kept at 8-15mm, the consumption of mold slag is not less than 0.4kg/t steel, and the agglomeration in the slag is removed in time. To ensure proper pulling speed, the pulling speed change range should be small, and the lifting speed range should be 0.15m/min to improve the operation level and control the fluctuation of the liquid level.
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