Water filling opening for continuous casting

Abstract

The invention discloses a water filling opening for continuous casting. The water filling opening for the continuous casting is formed by an inner layer and an outer layer; the raw materials of the inner layer comprise, by weight, 76 to 80 parts of minus 200-mesh aluminum titanate, 12 to 14 parts of minus 200-mesh silicon nitride, 6 to 8 parts of minus 200-mesh aluminum nitride and 4 to 6 parts of phenolic resin; raw materials of the outer layer comprise, by weight, 30 to 34 parts of 20-to-200-mesh poriferous mullite ceramic particles, 42 to 46 parts of minus 200-mesh mullite fine powder, 6 to 8 parts of minus 200-mesh zirconium mullite fine powder, 3 to 5 parts of minus 200-mesh chromium sesquioxide fine powder, 4 to 6 parts of minus 200-mesh clay fine powder, 1 to 3 parts of minus 200-mesh active alpha aluminum oxide micro powder and 3 to 5 parts of silica solution; the water filling opening is baked through the above inner and outer layer raw materials under an oxygen-free condition with the temperature to be at 1460 to 1500 DEG C after the raw materials are performed mixing granulation and mechanical pressing.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy refractory materials, in particular to an upper nozzle for continuous casting. Background technique [0002] With the development of modern high-speed, high-efficiency continuous casting technology and clean steel smelting technology, further improving the performance of existing continuous casting functional refractory materials and developing new materials to meet the requirements of contemporary continuous casting technology are urgent problems to be solved at present. . The upper nozzle is a disposable refractory component used for continuous casting. It is installed at the bottom of the ladle or tundish, and the lower part is connected with the submerged nozzle. The upper nozzle is in direct contact with molten steel during use, so the use of the upper nozzle of the tundish is improved. The service life requires that its material should be able to withstand the components s...

AI Technical Summary

Problems solved by technology

Although fused silica can be used directly without baking, the quartz nozzle has poor corrosion resistance, which is not conducive to continuous pouring of multiple furnaces, and it is easy to make molten steel penetrate into non-metallic inclusions, which affects the quality of molten steel; aluminum carbon or aluminum carbon zirconium nozzles It is easy to block during use, which affects normal production; mullite upper nozzle has poor corrosion resistance; corundum and high alumina have poor thermal shock resistance and are easy to peel off during use

[0006] In recent years, the advanced casting technology of multi-furnace continuous casting and high-speed casting has been used to prevent air inhalation at the upper nozzle of the tundish, prevent aluminum oxide clogging, resist thermal shock peeling, corrosion resistance, wear resistance, high-strength mechanical properties, etc. Higher requirements have been put forward. None of the existing technical products can fully meet the comprehensive performance requirements of the upper nozzle use conditions for materials at the same time. The service life in the continuous casting process is limited, and it is difficult to meet the new casting process requirements. In addition, the molding process is more complicated. , higher manufacturing cost