What is Nitrided Manganese?
As an alloy additive used in the production of steel, especially special alloy steel, stainless steel and heat-resistant steel, Nitrided Manganese plays an indispensable role in its preparation process. As the manufacturer of nitrided manganese, zxferroalloy supplies nitrided manganese flakes, nitrided ferromanganese block, nitrided manganese briquettes, nitrided manganese powder, and nitrided manganese cored wire.
In general, the chemical components of Nitrided Manganese that buyers are mainly concerned about and also focus on testing are :Mn,N,C,Si,P,S.
The specifications of Nitrided Manganese of Zhenxin Metallurgy are as follows.
| Mn (min) | C | Si (max) | S (max) | P (max) | N | |
| FeMn80N | 80.0 | 0.1-0.5 | 2 | 0.03 | 0.15 | 1.5-2.5 |
| FeMn70N | 70.0 | 0.1-0.5 | 2 | 0.03 | 0.30 | 4-8 |
| FeMn70N | 70.0 | 0.5-2.0 | 2 | 0.03 | 0.35 | 4-8 |
Production technology of Nitrided Manganese
Nitrided Manganese is usually obtained by filling medium carbon ferromanganese and low carbon ferromanganese with nitrogen.
Two preparation methods are commonly used:
- Liquid nitriding method, the principle is that in a closed container to the liquid medium and low carbon ferromanganese drum nitrogen, so that the alloy is saturated by gaseous or solid nitrogen components.
- Solid nitriding method, the principle of which is to heat medium and low carbon ferromanganese powder in a solid state in a closed container, and fully contact nitriding with nitrogen. The production process is as follows:
- Using medium and low carbon ferromanganese as raw materials, it is crushed and screened to obtain 80-100 mesh ferromanganese powder. Depending on the nitriding process. Ferromanganese powder can be used directly or pressed into blocks
- Ferromanganese powder or ferromanganese block is placed in a vacuum furnace and nitrided at 900-1100°C and 0.1 mpa for 8-12 hours.
Although Nitrided Manganese produced by liquid nitriding method has the advantages of high density, high strength, and high nitrogen utilization rate when used in steelmaking, its nitrogen content is low, about 2%, so it often cannot meet the needs of steelmaking.
Nitrided Manganese produced by solid nitriding method has higher nitrogen content and can meet the needs of steelmaking, but the nitriding temperature needs to be strictly controlled in production. Because the 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.
In general, the use of solid nitriding method to produce 1t of Nitrided Manganese requires about 1t of medium and low carbon ferromanganese and 1500kwh of electricity. And because the nitrogen content of Nitrided Manganese will increase with the increase of manganese content and increase with the decrease of manganese carbide content, the nitrogen content of low carbon ferromanganese with high Mn content is slightly higher than that of medium carbon ferromanganese with low Mn content.
Properties of Nitrided Manganese
The content of Mn and N main elements of ferric manganese nitride is high, while the content of harmful impurities such as P and S is low, and the nitrogen utilization rate is high and the amount added is small after adding into the melt, which can effectively save costs.
Nitrogen can improve the strength and plasticity of steel, expand the austenitic zone, refine the grain, and improve its processing performance.
Nitrided Manganese can replace part of nickel to reduce production costs.
Methods for Identification of Nitrided Manganese
Nitrogen in Nitrided Manganese can be determined by strong base distillation separation and aminosulfonic titration.
Manganese in Nitrided Manganese can be determined by potentiometric titration, ammonium nitrate oxidation titration and perchloric acid oxidation titration.
The main and secondary relationships of the factors affecting the determination of manganese content in silicomanganese alloy are as follows: heating temperature > Smoke time > Dosage of perchloric acid > The amount of phosphoric acid.