What is Silico Manganese?
Silico manganese is an alloy composed of manganese, silicon, iron and a small amount of carbon and other elements. It is a ferroalloy with wide application and large output. The chemical composition of silico manganese is mainly silicon and manganese, the content of silicon is generally between 10% and 35%, and the content of manganese is generally between 60% and 85%. In addition, there are some other impurities in the silicon-manganese alloy, such as calcium, magnesium, aluminum, titanium and so on.
Silico Manganese Specification
| Silico manganese code | Chemical composition(%) | ||||||
| Si | Mn | C | P | P | P | S | |
| Ι | Ⅱ | Ⅲ | |||||
| ≤ | ≤ | ≤ | ≤ | ≤ | |||
| FeMn64Si27 | 25.0-28.0 | 60.0-67.0 | 0.5 | 0.10 | 0.15 | 0.25 | 0.04 |
| FeMn67Si23 | 22.0-25.0 | 63.0-70.0 | 0.7 | 0.10 | 0.15 | 0.25 | 0.04 |
| FeMn68Si22 | 20.0-23.0 | 65.0-72.0 | 1.2 | 0.10 | 0.15 | 0.25 | 0.04 |
| FeMn64Si23 | 20.0-25.0 | 60.0-67.0 | 1.2 | 0.10 | 0.15 | 0.25 | 0.04 |
| FeMn68Si18 | 17.0-20.0 | 65.0-72.0 | 1.8 | 0.10 | 0.15 | 0.25 | 0.04 |
| FeMn64Si18 | 17.0-20.0 | 60.0-67.0 | 1.8 | 0.10 | 0.15 | 0.25 | 0.04 |
| FeMn68Si16 | 14.0-17.0 | 65.0-72.0 | 2.5 | 0.10 | 0.15 | 0.25 | 0.04 |
| FeMn64Si16 | 14.0-17.0 | 60.0-67.0 | 2.5 | 0.20 | 0.20 | 0.30 | 0.05 |
Silico Manganese Uses:
As an important metallurgical raw material, Silico manganese is mainly used as a deoxidizer and alloying agent in steelmaking to eliminate excess oxygen and sulfur in molten steel and improve the quality and performance of steel.
Silico Manganese is used as a deoxidizer.
During steelmaking, methods such as blowing oxygen are used to decarburize molten iron and remove harmful impurities such as phosphorus and sulfur. This process will increase the oxygen content in molten steel. Excessive oxygen content will reduce the mechanical properties of steel.
Silicon and manganese in Silico manganese have a strong affinity with oxygen. When Silico manganese is used in steelmaking, the deoxidation products MnSiO3 and MnSiO4 produced have melting points of 1270°C and 1327°C respectively. They have low melting point, large particles and easy to float. , Good deoxidation effect and so on.
Silico Manganese is used as an alloying agent.
Silicon can significantly improve the elasticity and magnetic permeability of steel, so silicon-based alloys must be used when smelting structural steel, tool steel, spring steel and silicon steel for transformers; general steel contains 0.15%-0.35% silicon, and structural steel contains 0.40%-1.75% silicon, 0.30%-1.80% silicon in tool steel, 0.40%-2.80% silicon in spring steel, 3.40%-4.00% silicon in stainless acid-resistant steel, 1.00% silicon in heat-resistant steel %-3.00%, silicon steel contains 2%-3% or higher.
Manganese can reduce the brittleness of steel, improve the hot workability of steel, and increase the strength, hardness and wear resistance of steel. As the saying goes, “no manganese can’t make steel”, manganese is an indispensable functional basic raw material for the production of high-quality steel, and there is no other element that can replace its role in the steel production process. The steel industry consumes more than 90% of its manganese production.
Silico manganese can not only improve the hardness and strength of steel, but also improve its corrosion resistance, adjust the melting point and solidification temperature, and at the same time improve the plasticity and toughness of steel. It will be described in detail below.
- Silico manganese can significantly increase the hardness and strength of steel. According to statistics, for every 1% increase in Silico manganese content, the tensile strength of steel can be increased by about 50MPa. This is because silicon and manganese in Silico manganese can form silicides and manganese compounds with carbon in steel, and these compounds can increase the lattice strength of steel, thereby improving its hardness and strength. Therefore, Silico manganese are indispensable additives in the manufacture of high-strength steels and alloy steels.
- Silico manganese can also improve the corrosion resistance of steel. The silicon in the Silico manganese can combine with the oxygen in the steel to form solid deoxidation, that is, form a dense silicon oxide film, thereby preventing oxygen and moisture from further corroding the steel surface, preventing oxygen from harming the steel, and improving the quality of the steel. the quality of. According to the experimental data, the corrosion rate of steel added with Silico manganese can be reduced by about 30% in the salt spray corrosion test. This means that Silico manganese can extend the life of steel and reduce repair and replacement costs.
- Silico manganese can also adjust the melting point and solidification temperature of steel. The silicon element in Silico manganese can lower the melting point and solidification temperature of steel, which is beneficial to the smelting and casting process of steel. According to actual production data, the melting point of steel can be reduced by about 30°C for every 1% increase in the content of the Silico manganese. This makes the iron and steel smelting process more efficient and energy-saving, and also improves the quality stability of the product.
- Silico manganese can also improve the plasticity and toughness of steel. The manganese element in Silico manganese can improve the plasticity and toughness of steel, making it easier to process and form. According to the experimental results, the cold bending performance of the steel after adding the Silico manganese can be improved by about 20%. This means that Silico manganese can reduce the processing difficulty of steel and improve production efficiency.
In summary, Silico manganese have broad application prospects in the steel industry. It can increase the hardness and strength of steel, improve corrosion resistance, adjust melting point and solidification temperature, and at the same time improve plasticity and toughness. These advantages make Silico manganese an important additive in the manufacture of high-strength steels and alloy steels. With the continuous development of the steel industry, the demand for Silico manganese will continue to increase. It is believed that in the future, Silico manganese will continue to play an important role and make greater contributions to the development of the steel industry.
