What Are The Advantages Of Ferroniobium In Steelmaking?

The addition of ferroniobium alloy in the steelmaking process is mainly based on the following important reasons:

1.Enhance the strength and toughness of steel

Ferro-niobium alloy can significantly improve the strength and toughness of steel. Niobium element forms stable compounds with carbon, nitrogen and other elements in steel, such as niobium carbide (NbC) and niobium nitride (NbN). These compounds play a role in dispersion strengthening in steel, effectively improving the tensile strength and strength of steel. Yield strength. At the same time, the addition of niobium can also increase the toughness of steel, making it less likely to break when impacted.

2.Refining the grains of steel

Niobium element plays a role in heterogeneous nucleation in steel and promotes the refinement of grains in steel. During the solidification process of steel, niobium carbides and nitrides serve as the core of heterogeneous nucleation, promoting the nucleation of ferrite and thus refining the grains. Fine grains can increase the strength and toughness of steel because grain boundaries are an important source of strength and toughness in steel. The finer the grains and the more grain boundaries, the higher the strength and toughness of the steel.

3.Improve the corrosion resistance of steel

Niobium element can react with other elements in steel to form a dense oxide film. This oxide film can prevent corrosive media such as oxygen and moisture from direct contact with the steel, thus extending the service life of the steel. Especially in nitric acid and high-temperature water vapor environments, the addition of niobium can significantly improve the corrosion resistance of stainless steel.

4.Improve the heat treatment properties of steel

Niobium carbides and nitrides can re-precipitate during the heat treatment of steel to form fine precipitation phases. These precipitated phases can hinder the movement of dislocations, thereby increasing the strength of the steel. In addition, niobium can also inhibit the excessive growth of austenite grains at high temperatures, maintain the fine-grained structure of steel, and help improve the high-temperature strength and heat resistance of steel.

5.Improve the welding performance of steel

Niobium can reduce the softening of the welding heat affected zone and improve the performance of the welded joint. During the welding process, niobium carbides and nitrides can re-precipitate, providing additional strengthening effects. At the same time, niobium can also reduce the loss of carbon during the welding process and prevent the embrittlement of welded joints.

In summary, adding ferroniobium alloy during the steelmaking process can significantly improve key indicators such as strength, toughness, corrosion resistance and heat treatment performance of steel, thereby optimizing the quality of steel and meeting the needs of various high-performance, long-life steel products.

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