GATE VALVE PLATE AND METHOD FOR MANUFACTURE THEREOF Russian patent published in 2018 - IPC B22D41/28 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy and can be used in the production of gate valves. Refractory plate of a gate valve is formed from a powder refractory material based on tabular alumina of the following composition, wt%: Al₂O₃ – not less than 75; ZrO₂ – not less than 5; C – no more than 5; SiO₂ – no more than 10; impurities, including Fe₂O₃, – no more than 5; then fired at 1,600–1,900 °C in an inert atmosphere. Thickness of the plate is determined from the relationship , where δ – plate thickness, mm; M – capacity of the steel ladle, kg; D_otv. – diameter of the outlet of the steel ladle, determined by the required rate of casting steel, m; σ= 100–150 MPa – the value of the compressive strength of the plate material in the temperature range 400–1,600 °C.

EFFECT: higher resistance of refractory plates, which reduces consumption thereof during when pouring metal.

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