FeSi75N Ferrosilicon Nitride | Blast Furnace Refractory Additive
FeSi75N Ferrosilicon Nitride is a nitrogen-modified ferroalloy based on FeSi75, produced through controlled nitridation to form stable Fe-Si-N phases with enhanced high-temperature reactivity. This specialized refractory additive is engineered to improve thermal shock and erosion resistance in demanding blast furnace environments.
Applications in Blast Furnace Refractory Systems
FeSi75N is specifically applied in taphole clay, runner linings, and high-wear refractory zones to enhance resistance against thermal shock, slag attack, and mechanical erosion caused by molten iron flow. ZhenAn supplies FeSi75N engineered for superior thermal stability and erosion-resistant performance in ironmaking systems.
Critical Need for Thermal Shock and Erosion Resistance
Blast furnace refractory systems operate under extreme and repetitive stress conditions:
- Continuous contact with molten iron and slag
- Rapid heating and cooling cycles during tapping
- High-velocity metal flow in runners and taphole zones
- Mechanical abrasion from solid and liquid phases
Without sufficient resistance, refractories experience surface spalling, deep erosion channels, structural weakening, and premature failure of taphole systems. FeSi75N reinforces both surface durability and internal structural stability.
Erosion Resistance Enhancement Mechanisms
Formation of Hard Nitrided Phases
During high-temperature exposure, FeSi75N promotes the formation of Si₃N₄-based phases that act as hard, erosion-resistant barriers.
Surface Hardening Effect
The refractory surface becomes more compact and less susceptible to mechanical wear from molten iron flow.
Reduced Slag Penetration Velocity
Nitride-containing phases reduce the ability of slag to penetrate deep into the refractory structure.
Improved Particle Cohesion
Stronger bonding between refractory particles reduces material loss under high-flow conditions.
Primary Applications in Ironmaking
FeSi75N serves as a functional additive in refractory formulations, not as a structural refractory itself. Typical applications include:
- Blast furnace taphole clay
- Runner and trough castables
- High-temperature repair materials
- Iron tap channel linings
Thermal Shock Resistance in Taphole Environments
Taphole areas undergo extreme thermal cycling with rapid heating during tapping and sudden cooling after closure, generating internal stress that leads to cracking. FeSi75N improves thermal shock resistance by stabilizing internal ceramic structure, reducing thermal expansion mismatch, improving stress distribution, and limiting crack propagation paths.
Wear Reduction in High-Flow Zones
FeSi75N significantly reduces wear in high-flow zones such as runners and tapholes by strengthening bonding between refractory particles, increasing resistance to mechanical scouring, creating a more compact microstructure, and enhancing surface hardness after sintering.
Slag Flow Resistance Improvement
FeSi75N enhances slag flow resistance by reducing slag wettability on refractory surfaces, forming protective nitrided reaction layers, increasing surface chemical stability, and minimizing slag infiltration into pores. This ensures slag flows over rather than into the refractory lining.
Technical Specifications
| Parameter |
Specification |
| Product Name |
FeSi75N Ferrosilicon Nitride |
| Base Alloy |
FeSi75 |
| Nitrogen Content |
20-30% |
| Silicon Content |
~75% |
| Particle Size |
0-3 mm / customized |
| Appearance |
Grey granular solid |
| Application |
Blast furnace refractories / taphole systems |
Performance Comparison: FeSi75N vs Conventional Additives
| Parameter |
FeSi75N |
Conventional Additives |
| Thermal Shock Resistance |
High |
Medium |
| Erosion Resistance |
Strong |
Limited |
| Slag Resistance |
Improved |
Standard |
| Surface Durability |
High |
Moderate |
| Service Life Impact |
Extended |
Shorter |
| Industrial Suitability |
Blast furnace systems |
General refractories |
Packaging and Delivery
ZhenAn supplies FeSi75N in controlled granular form designed for refractory blending and steel plant applications. Standard packaging options include 25kg moisture-resistant bags, 1MT jumbo bags, and reinforced palletized export packaging.
Each shipment includes comprehensive documentation: COA (Chemical Composition Report), nitrogen content certification, particle size distribution report, and quality consistency documentation. Export logistics are optimized for continuous supply to ironmaking and refractory industries.
Frequently Asked Questions
What is FeSi75N and how is it used in ironmaking refractories?
It is a nitrided ferrosilicon additive used to improve refractory performance in blast furnace applications.
How does FeSiN improve erosion resistance?
By forming hard nitrided phases and strengthening surface structure against mechanical wear.
Why is thermal shock resistance important in taphole environments?
Because rapid temperature changes cause cracking and structural failure in refractory systems.
Can FeSi75N reduce refractory wear?
Yes, it significantly improves resistance in high-flow and high-abrasion zones.
How does FeSiN improve slag flow resistance?
By reducing wettability and forming protective surface layers that minimize slag infiltration.
Why Choose ZhenAn FeSi75N
ZhenAn provides FeSi75N Ferrosilicon Nitride engineered for high erosion resistance, thermal shock stability, and long service life in blast furnace refractory systems. Our controlled production ensures consistent nitrogen performance and industrial reliability for demanding ironmaking applications.
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