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Detailed explanation of ferro manganese nitride

Release Time: 2024-01-02
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Ferro manganese nitride is an indispensable alloying agent for the production of special alloy steel, stainless steel and heat-resistant steel, which is usually obtained by filling nitrogen with medium and low carbon ferro manganese. Ferric manganese nitride is mainly used as a nitrogen additive in steelmaking production, which can improve the mechanical properties such as steel strength, fine grains, and stabilize austenite.

 

Peculiarity

The main element content of ferro manganese nitride is high, the harmful impurity content of phosphorus is low, the nitrogen utilization rate is high and the addition amount is small after adding into the melt. Nitrogen can improve the strength and plasticity of steel, expand the austenitic zone, refine the grain and improve the processability. Manganese metal nitride can replace some nickel and thus reduce costs.

 

 

 

Preparation method of ferro manganese nitride

Ferro manganese nitride is an indispensable alloying agent for the production of special alloy steel, stainless steel and heat-resistant steel, which is usually obtained by filling nitrogen with medium and low carbon ferro manganese. Ferric manganese nitride is mainly used as a nitrogen additive in steelmaking production, which can improve the mechanical properties of steel such as strength, fine grains and stabilize austenite.

The main element content of ferro manganese nitride is high, the harmful impurity content of phosphorus is low, the nitrogen utilization rate is high and the addition amount is small after adding into the melt. Nitrogen can improve the strength and plasticity of steel, expand the austenitic zone, refine the grain and improve the processability. Manganese metal nitride can replace some nickel and thus reduce costs.

Ferro manganese nitride can be prepared in two ways

(1) Liquid nitriding method: It is to drum nitrogen into the liquid medium and low carbon ferro mangane in a closed container, so that the alloy is saturated by gaseous or solid nitrogen components. The resulting ferric manganese nitride has the advantages of high density, high strength and high nitrogen utilization rate in steelmaking, but it often cannot meet the requirements of steelmaking because of its low nitrogen content.

 

(2) Solid nitriding method: It is heated in a closed container in a solid medium and low carbon ferro mangane powder, and fully contact with nitrogen nitriding. Solid powder of medium and low carbon ferro manganese and nitrogen or ammonia decomposition of nitrogen, the interaction will produce a series of nitrogen compounds, and the stability of these nitride decreases with the increase of temperature until decomposition, so the method should control the appropriate nitride temperature, under the case of 60 mesh of medium and low carbon ferro manganese powder in a closed container, In nitrogen and 650℃-1120℃ at the temperature of nitriding 4h-8h, can obtain 4-6% nitrogen content of ferric manganese nitride.

 

The nitrogen content increases with the increase of manganese content and increases with the decrease of manganese carbide content, so the nitrogen content of low carbon ferro manganese with high Mn content is slightly higher than that of medium carbon ferro manganese with low Mn content, and the resulting iron nitride product has a small density. If the melting density increases, the nitrogen content of the product will be significantly reduced.

 

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