Is Nitrided Ferro Manganese the Same as Nitrided Manganese?

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The nitrided ferro manganese is an alloying agent in the production of special alloy steel and stainless steel. Nitrogen is an element that can expand austenite zone. Both the Mn and N can replace the nickel, which is used in the stainless steel.

The nitrided manganese, well known as nitrided manganese metal, is obtained by filling the manganese metal with nitrogen.

The Differences of the Nitrided Ferro Manganese and the Nitrided Manganese

Although both of the nitrided ferro manganese and nitride manganese are mainly consist of N and Mn, they still have a lot of differences between each other.

Chemical composition of nitrided ferro manganese

GradeMnNCSiPS
FeNMn80801.5-2.51.02.00.30.03
FeNMn74744-81.02.00.30.03
FeNMn70703-41.02.00.30.03
Chemical composition of nitrided ferro manganese

Chemical composition of nitrided manganese metal

GradeMnNCPS
Nitrided Mn85856-70.20.050.05
Nitrided Mn90906-70.10.050.05
Chemical composition of nitrided manganese metal
  • Application: As nitrogen and manganese alloy additives, nitrided ferromanganese and nitride manganese metal are mainly used in the production of high-strength steel, stainless steel, heat-resistant steel, and other products. Nitrogen can improve the strength and plasticity of steel, expand the austenite region, and refined grains, and improve its machinability. They can replace part of nickel to reduce cost. The characteristics of nitrided manganese metal are: high content of Mn and N, low content of harmful impurities such as phosphorus, and high utilization rate of nitrogen after adding to the molten steel.
  • Forms: The nitride Ferro manganese is mainly processed into lumps, granule, and powder forms. The nitrided manganese metal is mainly processed into flake, powder, and briquette form.

The Similarity of the Nitrided Ferro Manganese and the Nitrided Manganese

The Manufacturing Process of Nitrided Ferro Manganese and Nitrided Manganese

The nitrided ferro manganese is obtained by filling the medium and low carbon ferro manganese with nitrogen, and the N content is 2-8%.

There are two ways of smelting nitrided ferro manganese: liquid nitriding and solid nitriding.

The liquid nitriding is filling the molten medium and low carbon ferro manganese with nitrogen, while the solid nitriding is filling the solid medium and low carbon ferro manganese with nitrogen. Both the liquid nitriding and the solid nitriding are smelting in the vacuum furnace.

Using the liquid nitriding, only about 2% of the nitrogen is dissolved in the alloy, which can’t be used in the steelmaking.

 At present, most manufacturers adopt solid nitriding. The solid manganese alloy act with nitrogen and occurred a nitrided alloy.

Flow chart of ferromanganese nitride production process 

The Nitrided Ferro Manganese (or Nitrided Mn) Production Process

  • Choose the medium and low carbon ferro manganese (or manganese metal) as raw material. The size of the material is no more than 120mm.
  • The raw material is crushed into powder of 0.177-0.149mm (80-100 mesh).
  • The powder can be nitrided directly or pressed into bricks for nitriding.
  • Put the material into the vacuum furnace. Nitrogen is supplied when the temperature in the furnace rises to 700℃, and the temperature continues to rise until nitriding begins at 900-1100℃.  Keep the pressure in the furnace at 0.1mpa and power off after 8-12 hours.  After 4-6 hours of natural cooling to 400-500 ℃, stop adding nitrogen.
  • Take out the finished nitrided ferro manganese (or nitrided manganese). Crush and pack them according to the customer’s requirement.

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