Method for adding oxidizable alloy in molten steel

Abstract

The invention discloses a method for adding oxidizable alloy in molten steel. The method comprises the following steps: (1) an alloy tank with a high-temperature mop on the upper end is taken, oxidizable alloy is added in the tank according to the component requirement of the alloy elements of molten steel, a high deoxidation alloy layer is covered on the oxidizable alloy, wherein the height of the high deoxidation alloy layer is 30-50 mm; (2) when the normal alloying of molten steel is completed, the bottom blowing technology of molten steel begins, the high-temperature mop is clamped to send the alloy tank into molten steel from the bottom blowing molten steel rolling site and ensure that the high deoxidation alloy layer is soaked in molten steel; and (3) the bottom blowing operation ofmolten steel is maintained, and when the alloy tank and the material in the alloy tank are fully molten in 5-10 seconds, bottom blowing is continuously performed for 3 minutes. By adopting the method, the alloy yield can be greatly increased, for example, the boron yield can be increased from 30% to more than 90%, the microalloy content is very stable, the fluctuation of microalloy elements can be lowered, the smelting cost can be reduced and the mechanical properties of steel can be ensured.

Description

1. Technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a method for adding an easily oxidizable alloy to molten steel. 2. Background technology [0002] At present, the alloying of molten steel in converters is carried out in the ladle. The principle of adding alloys should be added according to the steel type. For more expensive alloys that are easy to oxidize, they are added at the end, such as ferrovanadium, ferroniobium and boron. This kind of alloying method adopts alloy chute to add, which belongs to dynamic adding method. During the adding process, since the alloying of molten steel does not end, the oxidizing property is strong, which makes the oxidizable alloy with low density and low addition amount easily oxidized. , resulting in a low yield and unstable microalloy content, which not only increases the smelting cost, but also cannot guarantee the mechanical properties of the obtained steel. 3. Content of...

AI Technical Summary

Problems solved by technology

This kind of alloying method is added by alloy chute, which belongs to the dynamic adding method. During the adding process, the alloying of molten steel is not completed, and the oxidizing property is strong, so that the easy-to-oxidize alloy with low density and small amount of addition is easily oxidized. , resulting in low yield and unstable microalloy content, which not only increases the cost of smelting, but also cannot guarantee the mechanical properties of the obtained steel

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