Ferrosilicon nitride is a novel composite alloy material, primarily composed of silicon nitride (Si₃N₄) and ferrosilicon (Fe₃Si, Fe₂Si) phases, with small amounts of free silicon and silicon carbide. It combines the strong deoxidizing ability of silicon with the solid solution strengthening and grain refining effects of nitrogen, making it an ideal choice for efficient deoxidizers and microalloying additives in modern steelmaking processes.

AON METALS' FeSi3N4 is manufactured in strict accordance with national standards or even higher internal control standards, and is categorized according to its application:

Powdered ferrosilicon nitride for refractory materials: Used in blast furnace taphole clay and trough feedstock to improve the material's corrosion resistance and high-temperature strength.

Granular ferrosilicon nitride for steelmaking: Used in HRB400/500 grade reinforcing bars, oriented silicon steel, wear-resistant steel, and other steel grades, significantly improving steel performance through nitride strengthening.

ferro silicon nitride for steelmaking

chemical composition

Product Forms	Chemical Composition					Size	Application Scenarios and Key Functions
	N	Si	Fe	O ≤	H₂O ≤
Granular for steelmaking	28-32%	47-51%	12-17%	2.5%	0.5%	1-10mm / 3-8mm	Microalloying: Used in HRB400 steel bars, grain-oriented silicon steel, and wear-resistant steel. Function: Provides active nitrogen atoms to form nitride reinforcing phases and refines grain size.
Powder for refractory applications	28-32%	47-51%	14-17%	2.5%	0.5%	0-5mm / 100-200mesh	Blast furnace taphole clay and trough feedstock. Function: Improves the slag erosion resistance, high-temperature strength, and oxidation resistance of unshaped refractories.
Custom sizes	The composition range can be adjusted according to customer requirements, and specifications such as 0-3mm, 10-50mm, -100 mesh, and -200 mesh can be provided.						Meets special process requirements.

The advantages of ferrosilicon nitride in the steelmaking process are mainly as follows

Good deoxidation effect:

The silicon element in ferrosilicon nitride has a strong ability to bind oxygen, and can react with oxygen in molten steel to generate stable substances such as nitrogen, effectively removing oxygen from molten steel, thereby improving the quality of steel. Moreover, compared with traditional deoxidizers, it has better deoxidation effect and faster degassing speed, which helps save production time and cost.

Strong ability to absorb impurities:

During steelmaking, ferrosilicon nitride can absorb and combine impurities in molten steel, such as sulfur, oxygen, carbon, etc. These impurities will reduce the purity and strength of steel. Using ferrosilicon nitride as an impurity absorber can effectively improve the quality and purity of steel, reduce the formation of inclusions, and make the organizational structure of steel more uniform and the performance more stable.

Significant alloy strengthening effect:

During the steelmaking process, the iron atoms in the steel will combine with the nitrogen atoms in ferrosilicon nitride to form a new alloy phase. This alloy phase has excellent mechanical properties, such as high strength, high hardness and good wear resistance, which can effectively improve the strength, hardness and wear resistance of steel and meet the requirements of steel performance in different engineering fields.

Stable chemical properties:

Ferrosilicon nitride has stable chemical properties at high temperatures and will not deteriorate or melt in the high temperature environment of steelmaking. It helps to stabilize the chemical reactions in the steelmaking process, further improve the quality and performance of steel, and ensure the smooth progress of steelmaking production.

Grain refinement:

Ferrosilicon nitride can adjust the organizational structure of molten iron to form fine and uniform grains, thereby improving the mechanical properties of molten iron and improving the toughness and ductility of steel.

Cost reduction:

When producing high-strength microalloyed steel, a microalloying scheme of ferrosilicon nitride combined with other alloying elements is adopted, such as the FeV50+FeSi₃N₄ microalloying scheme when producing HRB400 steel bars. Compared with the single use of traditional alloying elements, it can significantly reduce the alloying cost, achieve cost reduction and efficiency improvement, and has good economic benefits.

ferro silicon nitride for steelmaking

FAQ

Q1: What are the advantages of ferrosilicon nitride compared to ordinary ferrosilicon and manganese nitride?

A1:

vs Ferrosilicon: Ferrosilicon nitride provides both silicon and nitrogen, achieving the dual functions of deoxidation and microalloying. Ordinary ferrosilicon can only deoxidize and cannot provide an effective nitrogen source.

vs Manganese nitride: The silicon element in ferrosilicon nitride itself also has deoxidation and strengthening effects, forming a synergistic effect with nitrogen. Furthermore, in certain steel grades (such as HRB400), nitrogen works in conjunction with silicon and manganese, resulting in even better strengthening effects.

Q2: Can using ferrosilicon nitride to replace part of the ferrovanadium really reduce costs?

A2: Yes, this is precisely the core economic value of ferrosilicon nitride. Ferrovanadium is expensive, while the nitrogen element in ferrosilicon nitride can promote VN precipitation, significantly improving the strengthening efficiency of vanadium. By adding nitrogen to the steel, the amount of ferrovanadium added can be reduced while maintaining strength. Depending on market price differences and specific processes, the alloy cost per ton of steel can be reduced by 15-30% or even more. We can provide you with a detailed cost calculation model.

Q3: Is the nitrogen yield of silicon nitride ferronitride stable? What factors affect it?

A3: The nitrogen yield is typically between 60-80%, but it is affected by the following factors:

Oxygen/sulfur content of the molten steel: The higher the oxygen and sulfur content, the lower the nitrogen yield. Therefore, the molten steel should be well deoxidized before addition.

Addition method and stirring: Adding with the steel stream and stirring with bottom-blown argon can significantly improve the yield.

Steel composition: The presence of nitride-forming elements such as Cr, V, and Nb in the steel increases the solubility of nitrogen, thereby increasing the yield.

Our technical team can assist you in optimizing the process to obtain a stable and high nitrogen yield.

Q4: What are your minimum order quantity (MOQ) and sample policy?

A4: As the source factory, we support customers in conducting small-batch verification. The MOQ for regular products is typically 25 tons (one container). At the same time, we are happy to provide 5-10 kg of free samples (you only need to pay for the shipping) for you to test the composition, size and metallurgical effect in the laboratory or on a small furnace.

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