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1. Analysis of the causes of steel leakage from the ladle slide

1. Slide leakage caused by mechanism reasons
⑴ The deformation of the bracket or the overuse of the spring leads to uneven pressure on the slide brick surface, with one side under greater force and the other side under less force. When the pressure of the molten steel exceeds the pressure on any side, the molten steel will enter between the two slides, causing steel clamping or steel leakage.
⑵ The slide bar falls off or the lower rotary sleeve loosens, resulting in insufficient pressure on the plate surface, which easily causes the gap between the clamped steel and the slide plate to increase during flow control, and eventually causes steel leakage. The slide bar problem also causes the trolley to run unevenly, and the loose lower rotary sleeve causes the lower slide plate to sink, which will cause gaps between the plate surfaces.
2. Slide plate leakage caused by slide plate material
⑴ When pouring calcium treated steel or high manganese steel, the upper water inlet and slide plate bricks have poor corrosion resistance, the water inlet and slide plate expand quickly, and the effective stroke of the slide plate becomes smaller, which is easy to cause cast flow control or plate surface clamping.
⑵ The upper and lower slide plate bricks have low strength at high temperature and poor resistance to “thermal shock”. Before pouring, the high temperature molten steel on the plate surface produces a strong “thermal shock”, resulting in tensile stress exceeding the strength of the slide plate, forming radial cracks centered on the pouring hole.
⑶ The working surfaces of the upper and lower slide plates have poor high temperature wear resistance, and the sliding surface is easy to “roughen”. After the molten steel is infiltrated, the “roughening” phenomenon is aggravated when pushing and pulling, and the friction resistance of the slide plate increases. In severe cases, steel leakage will occur between the sliding surfaces.