Casting technology for ensuring content of manganese in steel for nuclear power

Abstract

The invention relates to the technical field of casting, and discloses a casting technology for ensuring the content of manganese in steel for nuclear power. The casting technology comprises the following steps of first, performing electric furnace smelting, namely, performing crude smelting on molten steel in an electric furnace to obtain a raw material A with contents and temperature meeting process requirements; second, inputting the raw material A into a refining furnace, and regulating chemical components and temperature to obtain a semi-finished product B; third, vacuum direct injection,directly casting the semi-finished product B into a steel ingot mould in a vacuum tank through an argon protection injection flow; and fourth, demoulding, namely, demoulding after the process requirement demoulding time is met, and feeding a finished product to a forging factory with heat. According to the casting technology applicable to ensuring the content of the manganese in the steel for thenuclear power disclosed by the invention, the problems of loss of the content of the manganese caused by secondary oxidation are reduced; the amount of metal manganese added in a smelting process isreduced; the smelting time is shortened; the power consumption of per ton steel of the refining furnace is reduced; a tundish, a refractory material and a plug rod are abandoned; the number of inclusions in the steel is reduced; and the effects of improving the quality and reducing the cost are achieved.

Description

technical field [0001] The invention relates to the field of pouring technology, in particular to a pouring technology for ensuring the manganese content of steel for nuclear power. Background technique [0002] The traditional pouring method is that after the composition and temperature of the molten steel in the refining ladle are adjusted in place, the molten steel enters the vacuum tank through the tundish and pours into the ingot mold. The lining of the casting tundish is made of refractory material, and the SA508-3 steel for nuclear power has high manganese content. During the traditional casting process of steel ingots, the manganese content of molten steel will change due to physical and chemical processes. The [Mn] that leads to refining and tapping is due to secondary oxidation or chemical reaction with the tundish refractory material, resulting in a loss of about 0.15% of the manganese content in molten steel from tapping to solidification during this process. Th...

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Problems solved by technology

[Mn] that leads to refining and tapping is due to secondary oxidation or chemical reaction with the tundish refractory material, resulting in a loss of about 0.15% of the manganese content in molten steel from tapping to solidification during this process

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