A kind of multi-layer composite flow steel brick and its production method

Abstract

The invention discloses a multi-layer composite runner brick and a production method thereof. The multi-layer composite runner brick comprises a brick base body, wherein the brick base body is provided with a steel liquid flow passage; a combining layer and a working layer are sequentially compounded onto the surface of the steel liquid flow passage; the brick base body is prepared from main materials including flint clay, pyrophyllite, third-level alumina clinker and clay, and a small amount of added sillimanite, andalusite and potassium feldspar; the working layer is prepared from main materials including corundum, mullite and alpha-Al2O3 micropowder, and a small amount of added sillimanite, silicon micropowder, clay and andalusite; the raw materials of the working layer are compounded into slurry, the slurry is sprayed onto the surface of the steel liquid flow passage and is fired, and the working layer reacts with a base body layer to form a mullite-based combining layer, thereby forming a whole; in a steel casting process, the working layer, the combining layer and the base body layer are closely combined together, so as to avoid the separation of the working layer. The multi-layer composite runner brick has the advantages that the cost is low, the high-temperature property is good, the anti-scouring erosion capability is strong, the market competition advantage is obvious, the thickness of the working layer can be adjusted through design, and the multi-layer composite runner brick is suitable for smelting different types of special steel.

Description

technical field [0001] The invention relates to a refractory material for special steel smelting, in particular to a multi-layer composite flow steel brick for casting mold steelmaking, 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] For a long time, due to the die casting steelmaking process, the flow steel bricks used are disposable products. Therefore, from the perspective of cost, most of the existing flow steel bricks for die casting steelmaking use clay materials. With the continuous develop...

AI Technical Summary

Problems solved by technology

However, due to the poor erosion resistance of traditional clay flow steel bricks, it is easy to cause steel inclusions, which seriously affects the quality of steel.

In order to reduce inclusions, some domestic enterprises have adopted ordinary high-alumina flow steel bricks (Al 2 o 3 content ≤ 60%), but due to the poor thermal shock performance of this kind of brick, it is easy to burst during use, and the corrosion resistance performance cannot meet the production requirements

In addition, there are also studies and production of corundum mullite, corundum, high alumina (Al 2 o 3 Content ≥ 80%) equal-flow steel bricks, although this kind of flow steel bricks can better meet the production of special steel, but its cost is expensive, the firing temperature is high, and resources and energy are wasted.

Due to its high price, it is currently only used in some expensive special alloy steels, and cannot be widely used in other special steel smelting production

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