Production method of built-in water-cooling channel cast steel component

Abstract

The production method of internal water cooling channel steel-casting is characterized by that two layers of spiral internal chill are winded round external periphery of steel pipe, in which first layer of spiral internal chill is winded round the steel pipe, and second layer of spiral internal chill is winded round first layer of spiral internal chill, at the same time, when it is poured, the low-temp. nitrogen gas is blown into the steel pipe, the nitrogen gas inlet temp. is -5- -10 deg.C, the nitrogen gas pressure is less than or equal to 0.2 MPa. After the pouring is completed, the low-temp. nitrogen gas is further blown into the steel pipe for 2-4 min. so that the steel pipe will not be melted through and can not be deformed when the molten metal whose melting point is identical to that of steel pipe is poured, therefore there is not gap or thermoresistance layer between steel pipe and base body.

Description

technical field [0001] The invention relates to a manufacturing method of a casting with a built-in water-cooling channel, which is suitable for casting water channel steel pipes of products such as blast furnace staves and throat steel bricks, and water-cooling guide rails for cooling beds of continuous casting machines, and belongs to the technical field of material engineering. Background technique [0002] Casting water channels inside the steel castings not only has good cooling performance, but also has better strength, toughness and thermal shock resistance than other products. However, the problem of casting steel pipes into high-temperature molten metal has not been solved, which has always hindered the internal casting of steel castings. Universal application of water cooling channel products. At present, domestic research institutes and manufacturers have been engaged in the development and research of built-in water-cooled channel steel castings. For example, CN9...

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Problems solved by technology

[0002] Casting water channels inside the steel castings not only has good cooling performance, but also has better strength, toughness and thermal shock resistance than other products. However, the problem of casting steel pipes into high-temperature molten metal has not been solved, which has always hindered the internal casting of steel castings. Universal application of water cooling channel products

At present, domestic research institutes and manufacturers have been engaged in the development and research of built-in water-cooled channel steel castings. For example, CN99246862.0 provides a cast steel cooling stave for blast furnaces made of cast steel substrates and cooling water pipes. There is still a gap between the base body and the water pipe. When the steel pipe is cast into molten steel at 1550-1600 °C, due to the influence of the liquid temperature, it is very easy to melt through or deform the steel pipe. Improper measures will greatly reduce the thermal conductivity of the product.

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