Slide gate nozzle brick utilized in metallurgic cast and prepn. thereof

Abstract

A sliding sprue brick for metallurgical casing features that at least its surficial working layer is prepared from high-Al2O3 refractory aggragate (75-98 wt.%) and metallic microparticles (2-25 wt% whose smelting point is less than 1000 deg.C through mixing and calcining at 400-1300 deg.C in neutral or reductive atmosphere. Its advantages are high resistance to oxidization, corrosion, heat shock and high-temp water, and high strength.

Description

technical field

[0001] The invention relates to the improvement of the composition and preparation method of sliding nozzle bricks for metallurgical casting (molten steel casting). Background technique

[0002] At present, sliding nozzle bricks (upper and lower nozzles, upper and lower sliding plate bricks) for metallurgical casting are commonly used in four major types of materials, such as aluminum carbon, aluminum zirconium carbon, magnesia, and corundum. With the development of steelmaking technology, the requirements for sliding nozzle bricks are increasing. , especially higher requirements for thermal shock resistance, corrosion resistance, high temperature structural strength and high temperature wear resistance. However, although aluminum-carbon and aluminum-zirconium carbon sliding nozzle bricks have the characteristics of good thermal shock resistance and high strength, they have the disadvantage of being easily oxidized. When sliding bricks are used in multiple fu...

Examples

Embodiment

[0014] According to the example table (Table 1), take the processed raw materials and binder respectively, fully mix them evenly in the kneader, press the nozzle and the slide plate respectively with a brick press, and dry the adobe at room temperature -300°C, then reduce the Or in a neutral atmosphere, heat treatment at 1000°C / 16h and 500°C / 16h respectively to obtain a solid solution sliding nozzle brick with metal (aluminum)-oxygen-nitrogen, and then impregnated with asphalt, and the sliding brick is finally smoothed, hooped and assembled , Coated surface.

[0015] It is also possible to replace metal particles with metal fibers ranging from 0.2-0.5mm in diameter and 3-10mm in length at 0.5-3% respectively;

[0016] The raw materials of the above examples can also be used as the working surface layer material of the sliding nozzle brick, the thickness of the working surface layer is 15%, 30% and 50% of the thickness of the sliding nozzle brick, and the bottom layer is respec...

technical field

[0001] The invention relates to the improvement of the composition and preparation method of sliding nozzle bricks for metallurgical casting (molten steel casting). Background technique

[0002] At present, sliding nozzle bricks (upper and lower nozzles, upper and lower sliding plate bricks) for metallurgical casting are commonly used in four major types of materials, such as aluminum carbon, aluminum zirconium carbon, magnesia, and corundum. With the development of steelmaking technology, the requirements for sliding nozzle bricks are increasing. , especially higher requirements for thermal shock resistance, corrosion resistance, high temperature structural strength and high temperature wear resistance. However, although aluminum-carbon and aluminum-zirconium carbon sliding nozzle bricks have the characteristics of good thermal shock resistance and high strength, they have the disadvantage of being easily oxidized. When sliding bricks are used in multiple fu...

Examples

Embodiment

[0014] According to the example table (Table 1), take the processed raw materials and binder respectively, fully mix them evenly in the kneader, press the nozzle and the slide plate respectively with a brick press, and dry the adobe at room temperature -300°C, then reduce the Or in a neutral atmosphere, heat treatment at 1000°C / 16h and 500°C / 16h respectively to obtain a solid solution sliding nozzle brick with metal (aluminum)-oxygen-nitrogen, and then impregnated with asphalt, and the sliding brick is finally smoothed, hooped and assembled , Coated surface.

[0015] It is also possible to replace metal particles with metal fibers ranging from 0.2-0.5mm in diameter and 3-10mm in length at 0.5-3% respectively;

[0016] The raw materials of the above examples can also be used as the working surface layer material of the sliding nozzle brick, the thickness of the working surface layer is 15%, 30% and 50% of the thickness of the sliding nozzle brick, and the bottom layer is respec...

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