Baffle device for sealing molten steel and fabrication method thereof as well as die applying the baffle device

Abstract

The invention provides a baffle device for sealing molten steel and a fabrication method thereof as well as a die applying the baffle device. The baffle device comprises a steel plate part, a fire-resistant filler and a coating, wherein, the steel plate part is a steel plate with a preset thickness, the steel plate part is provided with a first side face and a second side face which are oppositely arranged, the first side face is equipped with an annular inverted-cone dovetail groove, and the size of the groove bottom on a radial section is more than that of a notch of the inverted-cone dovetail groove; the outer diameter of the inverted-cone dovetail groove is 1.05 times more than that of a centrifugal casting pipe, and the outer diameter of the inverted-cone dovetail groove is 0.95 times less than that of the baffle device; the inner diameter of the inverted-cone dovetail groove is 0.75-0.85 times that of the centrifugal casting pipe; the fire-resistant filler is filled in the inverted-cone dovetail groove; and the coating is coated on the surface of the steel plate part and the fire-resistant filler. The baffle device has the advantages of high temperature resistance, good sealing property, strong non-deformability, molten steel erosion resistance and lowered cost, which prevents the fire-resistant filler from falling from the baffle device into the die in the case of high-speed rotation vibration.

Description

technical field [0001] The invention relates to a sealing baffle device for centrifugal casting of thick-walled pipes, in particular to a sealing baffle device and manufacturing method for sealing molten steel used in centrifugal casting of nuclear power water reactor main pipes And a mold using the baffle device. Background technique [0002] With the rapid economic development, people's living standards continue to improve. Demand for electricity is growing, but domestic coal storage is dwindling. Thermal power generation is also very polluting to the environment, so there must be a new energy source to replace it—nuclear energy. In the past, the main pipes of nuclear reactors used to be imported, but now, with the vigorous development of localization of nuclear energy equipment, the centrifugal casting technology of thick-walled pipes in China is particularly prominent. [0003] This new sealing baffle device is particularly prominent in the centrifugal casting process...

AI Technical Summary

Problems solved by technology

For cast pipes with large wall thickness (such as straight pipes for nuclear power main pipelines), due to the thick wall and long effective length of cast pipes, the cooling speed of molten steel is slow and the solidification time is long, so it is easy to burn through the refractory fiberboard with a refractoriness of about 1000°C , so that the molten steel leaks out under the action of a large centrifugal force, causing major safety accidents

And because the refractory fiberboard can only be used as a single seal, its high temperature strength is low, and the auxiliary cost is relatively large

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