Silicon manganese nitride is mainly composed of Si3N4 and Mn5N2 with a mixture of non-nitride ferrosilicon, non-nitride silicon manganese, and a small number of other ingredients. The granular product of silicon manganese nitride is off-white. The main use of Silicon manganese nitride is increasing nitrogen for silicon-oriented steel, high-strength steel, stainless steel, and cast steel.
Product information
Size: 10-100MM; 10-50MM; 1-10MM
Shape: lump, briquette, powder
Or as customer’s requirement.
Chemical composition of Silicon manganese nitride
| Items | Mn | Si | N | C | S | P | Fe |
| Ⅰ | 40~45 | 20~26 | 16~21 | ≤2.0 | ≤0.04 | ≤0.04 | rest |
| Ⅱ | ≤10 | 42~48 | 24~27 | ≤1.5 | ≤0.02 | ≤0.1 | rest |
| Ⅲ | ≤15 | 38~45 | 25~30 | ≤0.8 | ≤0.02 | ≤0.1 | rest |
Application of Silicon manganese nitride
Some micro-alloyed steels with increased nitrogen can give full play to the role of microalloying elements, saving the number of microalloying elements, and effectively reducing production costs. Therefore, nitride is a good additive in metallurgical production. In recent years, the special effects produced by the interaction of nitrogen and alloying elements have gradually attracted attention, and a series of high-nitrogen ferroalloy varieties have been developed: vanadium nitride, manganese nitride, nitrided ferro chrome, ferrosilicon nitride, etc.
However, these nitride alloys generally have some disadvantages: for vanadium nitride, due to the limited resources of vanadium, its production cost remains high; the use of Ferro niobium nitride requires an increase in the rolling temperature, which is difficult for much domestic steel rolling equipment to achieve this requirement: For manganese nitride and ferrochromium nitride, the mass fraction of nitrogen in the alloy is less than or equal to 6%, which is of little application value; the nature of titanium in ferrotitanium nitride is very active and difficult to control, and the yield in molten steel is low. It was not until the development of Silicon manganese nitride ( MnSiN ) alloy that the nitride effectively achieved the effect of smelting additives.
Silicon manganese nitride is a new type of steel additive. Compared with conventional nitride alloys, it has excellent performance and application advantages. Manganese plays a role in deoxidation, desulfurization, and alloying in steelmaking. Manganese can eliminate or weaken the hot brittleness caused by sulfur, thereby improving the hot workability of the steel. It can also refine the pearlite grains and increase the strength of the pearlite steel, and improve the hardenability of the steel. Silicon nitride has high-temperature thermal stability, thermal shock resistance, chemical stability, and good electrical insulation and rigidity. Silicon-manganese nitride alloy is compatible with the special properties of silicon nitride and manganese nitride. Its performance is even better after silicon, manganese, and nitrogen are combined at the same time.
Silicon-manganese nitride has good rapid heat resistance, thermal conductivity, chemical stability, and small thermal expansion. Its strong microalloying effect and nitrogen increasing effect are used in the fields of silicon oriented steel, HRB400, or higher rebar and have great market demand.
The currently commonly used microalloying scheme to produce HRB400 rebar is to add FeV50 or VN12 or FeNb. If FeV50+ FEMnSiN, or FeV50 + FeSi3N4 is used, the strengthening cost is lowest.
Features of Silicomanganese nitride
Manganese nitrides are easily decomposed into molten steel for absorption, the recovery rate of nitrogen is high, the fluctuation range of [N] in molten steel is small, and the strengthening cost is low.
- High density
- Easy to decompose and improve the recovery rate of nitrogen
- Reinforce the solid solution strengthening the performance of steel
- Reduce production costs
Preparation of Silicomanganese nitride
There are currently five preparation methods for silicon manganese nitride alloys: vacuum sintering, secondary nitriding, microwave synthesis, high-temperature self-propagating synthesis, and atmospheric one-step synthesis. There is space for optimization and improvement in the existing preparation processes. In the future, it will continue to explore and improve in terms of simplifying the operation process, shortening the reaction time, and reducing the production cost.