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Inconsistent temperature and pulling speed – the higher the superheat of the molten steel, the thinner the copper mould tube shell thickness. The shell expands due to the static pressure exerted by the molten steel in the mold. When the strength of the billet shell is not enough, breakout is easy to occur. Inconsistent and uneven temperatures have a great impact on the generation of breakout. When the pulling speed increases, breakout is more likely to occur because the copper mould tube is not lubricated enough. From the meniscus to the mould assembly shell/copper mould tube wall, the copper mould tube flux has poor fluidity, and increasing the pulling speed will lead to the total heat release. reduce. Breakout is often caused by pulling rates that are too high, when the billet shell does not have enough time to solidify to the required thickness, or the metal is too hot, which means that final solidification occurs just below the straightening rolls, due to the stress applied during straightening, the billet Shell torn. When the carbon content in the steel is constant, the temperature is high and the pulling speed is fast, and the steel breakout is easy to occur. Any change in the vibration setting will cause breakout to occur, as reducing vibration marks by increasing the vibration frequency increases the mold assembly velocity and thus the friction at the interface.