The surface cracks of the Q235B steel plate are mainly caused by the original surface crack defects of the continuous casting billet and the existence of inclusions in the steel. Through the investigation of the steelmaking process, it is found that the occurrence of continuous casting slab defects and steel plate inclusion defects is mainly affected by the following two aspects.
The chemical composition of molten steel, the molten steel smelting analysis of the corresponding heat of the cracked steel plate conforms to the standard, but through the detection and analysis of the inclusions in the steel plate produced by the continuous casting billet rolled by the continuous casting machine in the past, it is found that when the S content in the molten steel is > 0.010%, the finished Q235B steel plate The probability of sulfide inclusions is greatly increased.
In the continuous casting process of Q235B steel plate, the unsteady casting slab is often affected by various factors such as the change of the pulling speed, the tundish, and the fluctuation of the liquid level of the mold. Cause covering agent and mold flux to get involved in molten steel.
The disordered flow of molten steel at high temperature is intensified, which affects the cleanliness of molten steel by scouring the tundish refractory.
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