Clay-corundum mullite composite runner brick, and production method thereof

Abstract

The invention discloses a clay-corundum mullite composite runner brick. The clay-corundum mullite composite runner brick comprises a brick base body provided with a molten steel runner; the surface of the molten steel runner is combined with a working layer so as to improve washing resistance and erosion resistance of the clay-corundum mullite composite runner brick; the bonding surface of the brick base body with the working layer is designed to be a staggered slot structure; cheap flint clay, clay raw material, and pyrophyllite raw material are taken as the main materials of an outer layer of the brick base body; tabular corundum, electro-fused white corundum, electro-fused mullite, and sintered alpha-Al2O3 micro powder are taken as the main materials of the working layer; the thickness of the brick base layer and the thickness of the working layer can be adjusted based on the kind of alloy steel to be smelted. In production, a clay brick base body green body and a corundum mullite working layer self-flowing material are prepared respectively; a mould is delivered into the clay brick base body green body, and the gaps between the mould and the clay brick base body green body are filled with the corundum mullite working layer self-flowing material; and at last, the clay-corundum mullite composite runner brick is obtained via roasting and sintering at 1350 to 1400 DEG C. The clay-corundum mullite composite runner brick is low in cost, and high in thermal insulation performance and molten steel washing erosion resistance; and the market competitive advantages are obvious.

Description

technical field [0001] The invention relates to a refractory material for special steel smelting, in particular to a clay-corundum mullite composite flow steel brick, and also relates to a production method of the flow steel brick. Background technique [0002] Flow steel bricks are hollow refractory bricks that are built in the groove of the bottom plate for pouring ingots and connect the sub-steel bricks and ingot molds, generally with a cuboid hollow structure. In order to reduce the resistance during the flow of molten steel and prevent leakage of steel, it is required that the inner flow channel of the flow steel brick is smooth, the shape is regular, and the joints are tight. [0003] With the continuous development of alloy steel technology, especially the development of special alloy steel technology, the quality of steel is constantly improving, and the quality of flow steel bricks used in it needs to be continuously improved. The traditional clay-based and ordinar...

AI Technical Summary

Problems solved by technology

However, considering the characteristics of one-time use of flow steel bricks, the cost of this type of flow steel bricks is undoubtedly too expensive, and the performance cannot fully meet the needs of use

For example, mullite flow steel bricks have good thermal shock resistance, but poor erosion and erosion resistance; corundum flow steel bricks have strong erosion and erosion resistance, but poor thermal shock resistance

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