What are the common types of continuous casting breakoutThe more serious problem in continuous casting is the breakout. When the slab shell ruptures, the stati
What are the common types of continuous casting breakout
The more serious problem in continuous casting is the breakout. When the slab shell ruptures, the static molten steel in the billet overflows and blocks the machine. This requires a lot of manpower. Generally, it is divided according to the appearance of the breakout shell. In different situations, different measures will be taken accordingly.
Type of continuous casting breakout:
1. Suspension or bonding causes breakout-the molten steel is bonded to the copper tube of the mold, so it is called bonding or suspension. This may be caused by the lubrication discomfort or improper adjustment between the crystal parts and the billet shell, and the lubrication discomfort may be caused by poor quality mold powder, slag inclusions in the billet shell, molten steel overflow, corner seams, and billet continuous casters. Caused by poor profit, inequality and other reasons.
2. Types of continuous casting breakout: breakout caused by cracks—longitudinal cracks at the corners of the slab shell and longitudinal cracks on the wide surface will cause breakout. If longitudinal cracks cause steel breakout, the mold slag will flow unevenly, and the uneven heat transfer will result in uneven thickness of the blank shell. Improper selection of mold slag and uneven cooling will cause the blank shell to crack during cooling.
3. Breakout with slag inclusions-the slab shell entrains protective slag or large-grain inclusions to reduce heat transfer, forming a thin slab shell and breakout. During billet continuous casting, secondary oxidation products, improper deoxidation products in high-viscosity slag during low-carbon steel smelting, and improper spraying of medium aluminum wire cause high Al2O3.
In order to prevent steel leakage, we need to understand the fluidity of molten steel, the temperature state of molten steel, the state of baking of the tundish and the nozzle, and the quality of the protective slag. The size of the injection flow and the residence time of molten steel in the crystal parts should be determined according to the section of the cast slab. The starting speed is generally maintained at 0.5m/min, and the increase speed should be slow (0.15 m/min) to prevent excessive fluctuations in the crystal liquid level.
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