The Difference Between Ferromanganese Nitride and Ferromanganese

Ferromanganese nitride is an alloy additive mainly composed of nitrogen, manganese and iron. Compared with traditional ferromanganese alloy, the addition of nitrogen gives it unique properties.

First, ferromanganese nitride has a high melting point, good thermal stability and strong antioxidant ability, and can remain stable in high temperature environments, effectively avoiding the loss of traditional alloys during the steelmaking process.

Second, the addition of ferromanganese nitride can significantly improve the mechanical properties of steel, such as hardness, strength and toughness, thereby improving the quality and service life of the final product

Third, ferromanganese nitride has good compatibility with molten steel and is easy to be evenly distributed in the steel.

Therefore, ferromanganese nitride is often used in steel production, especially special alloy steel, stainless steel and heat-resistant steel.

Differences in Chemical Composition Between Ferromanganese Nitride and Ferromanganese

Ferromanganese, mainly is composed of two elements: manganese and iron, with a manganese content of about 65-85%. It is a commonly used alloy additive in steel production. Its working principle is to adjust the manganese content in molten steel to enhance the strength and toughness of steel. According to the different carbon content, ferromanganese is further divided into high carbon ferromanganese, medium carbon ferromanganese and low carbon ferromanganese. The specifications are as follows:

TypeGradeMnC ≤Si ≤P ≤S ≤
LC FeMnFeMn88C0.285.0-92.00.22.00.30.02
FeMn84C0.480.0-87.00.42.00.30.02
FeMn84C0.780.0-87.00.72.00.30.02
MC FeMnFeMn82C1.078.0-85.01.02.50.350.03
FeMn82C1.578.0-85.01.52.50.350.03
FeMn78C2.075.0-82.02.02.50.400.03
HC FeMnFeMn78C8.070.0-82.08.02.50.330.03
FeMn74C7.570.0-77.07.53.00.380.03
FeMn68C7.065.0-72.07.04.50.400.03

Ferromanganese nitride is a more complex chemical combination with nitrogen added to ferromanganese. The introduction of nitrogen not only improves the melting point and thermal stability of the alloy, but also gives ferromanganese nitride unique metallurgical properties, making it show extraordinary value in the specific steel manufacturing process. The specifications of ferromanganese nitride of Zhenxin Metallurgical Company are shown below.

 Mn (min)CSi (max)S (max)P (max)N
FeMn80N80.00.1-0.520.030.151.5-2.5
FeMn70N70.00.1-0.520.030.304-8
FeMn70N70.00.5-2.020.030.354-8

Differences in Metallurgical Properties Between Ferromanganese Nitride and Ferromanganese.

Impact on steel properties

Ferromanganese: It mainly acts to improve the strength and toughness of steel, and improves the tensile strength and corrosion resistance of steel by forming a stable manganese-based alloy phase. Specifically, ferromanganese has the following three effects on steel:

Deoxidation and desulfurization. Ferromanganese is mainly used as a deoxidizer in the steelmaking process. It can react with oxygen in the molten steel to form manganese oxide (MnO). This oxide is lighter and will float to the surface of the molten steel to form a slag layer, thereby reducing the oxygen content in the steel. At the same time, ferromanganese can also react with sulfur to form manganese sulfide (MnS) with a higher melting point, which also floats to the surface for removal, reducing the adverse effects of sulfur on the brittleness of steel.

Improvement of strength and hardness. Manganese can significantly improve the strength and hardness of steel. It improves the hardness of steel by solid solution strengthening and the formation of fine carbides, etc., and can also improve the hardenability of steel, so that the steel can obtain a better hardness distribution after quenching.

Enhance plasticity and toughness. Although manganese increases hardness, it also enhances the plasticity and toughness of steel, especially in low carbon steel. This is because manganese can inhibit pearlite transformation and promote the uniform distribution of ferrite and pearlite, thereby improving the overall performance of steel.

nitrided ferro manganese

Ferromanganese nitride: In addition to enhancing strength, it can also significantly improve the welding and processing properties of steel. The formation of nitrides makes it less likely for steel to crack during welding and improves the fracture toughness of welded joints. Compared with ferromanganese, ferromanganese nitride has the following effects on steel:

Grain refinement and strength enhancement. The addition of ferromanganese nitride can promote the refinement of steel grains. This is because ferromanganese nitride forms stable nitrides in steel. These nitrides act as non-spontaneous nucleation cores, which promote the refinement of grains during solidification, thereby improving the strength and plasticity of steel.

Improve welding performance. The nitrogen in ferromanganese nitride can combine with carbon in steel to reduce the formation of pores and cracks in the weld and improve the quality of the welded joint. The presence of nitrides can also increase the hardness and strength of the weld metal and improve the performance of the welded area.

Stabilize austenite. In some types of steel, ferromanganese nitride can stabilize the austenite phase, which means that the steel can maintain the structure of austenite even at lower temperatures, which is very important for manufacturing steels that require good ductility and impact toughness.

Improve corrosion resistance. The addition of ferromanganese nitride can sometimes improve the corrosion resistance of steel. This is because the formation of nitrides can prevent the invasion of corrosive media, and manganese itself also has a certain corrosion resistance.

Optimization of production process

Ferromanganese: In the steelmaking process, ferromanganese is mainly used for deoxidation and alloying, which helps to simplify the production process, but has limited improvement in energy consumption and production efficiency.

Ferromanganese nitride: Due to its high thermal stability and oxidation resistance, it can remain stable in a wider temperature range, thereby simplifying the steelmaking process and reducing energy consumption. According to industry reports, the steelmaking process using ferromanganese nitride can reduce power consumption by an average of 10%-15%, significantly improving production efficiency.

In conclusion, although both ferromanganese and ferromanganese nitride are closely related to steel production, they have obvious differences in composition and performance. Understanding these differences will help us make more accurate and reasonable decisions in steel production and material selection.

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