Method for reducing nitrogen content of welding steel wire rod

Abstract

The invention discloses a method for reducing the nitrogen content of a welding steel wire rod. The method comprises the following steps of: treating the combination of molten iron and waste steel in a primary refining electric furnace, wherein the molten iron accounts for more than 70 percent; tapping at the temperature of between 1,620 and 1,650 DEG C; adding 10 to 20 kg / ton of metallic manganese and 4 to 10 kg / ton of ferromolybdenum into the molten steel after tapping, and delivering the mixture to a refining furnace; after the mixture is delivered to the low frequency (LF) refining furnace, sequentially adding a first batch of slag and a second batch of slag; after the slag becomes white, performing fine adjustment of alloy in the LF refining furnace to prevent nitrogen absorption caused by the naked molten steel in the ladle hoisting process, and finally adding 1 to 2 kg / ton of powdery carbon-free covering agent; and preventing the molten steel from absorbing nitrogen by using a fiber sealing ring during continuous casting. The method is simple in process route, strong in operability and easy to control.

Description

technical field

[0001] The invention relates to a smelting production process for producing high-purity welding wire steel by an electric furnace in the metallurgical industry, in particular to a method for reducing nitrogen content in a welding steel wire rod. Background technique

[0002] With the development of metallurgical technology, the content of other impurity elements such as oxygen, sulfur, hydrogen, etc. can be removed to a very low level. However, denitrification is not an easy task. The ionic radius of nitrogen is larger than that of hydrogen, and the diffusion coefficient in steel is two orders of magnitude smaller than that of hydrogen. The effect of vacuum dehydrogenation is very good, but vacuum is not good for denitrification. So easy, nitrogen is not as active as oxygen, and can form inclusions with strong deoxidizers such as aluminum, barium, silicon, etc., and be removed by floating; while nitrogen is much less active, and nitrides formed with most allo...

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