Ferro Silicon Nitride (FeSiN) | TN≥30% Si₃N₄ for Steelmaking & Blast Furnace Refractory
Factory direct ferro silicon nitride — one product, two forms: powder for blast furnace taphole clay and granules for HRB400 rebar nitriding. YB/T4239-2010 certified.
| Total Nitrogen (TN) | ≥30% |
| Silicon (Si) | 47-52% |
| Iron (Fe) | 12-17% |
| Aluminum + Calcium | ≤2.5% |
| Bulk Density | ≥3.6 g/cm³ |
| Standard | YB/T 4239-2010 |
| Particle Sizes | -200 mesh powder / 1-3mm / 10-50mm granules |
What Is Ferro Silicon Nitride?
Ferro Silicon Nitride (FeSiN) is a dual-purpose ferroalloy whose main crystalline phase is β-Si₃N₄ grown around an Fe₃Si metallic core. It behaves like pure silicon nitride (Si₃N₄) at roughly half the cost. The Fe₃Si iron phase actively promotes sintering and acts as a plastic phase during hot processing — a performance mechanical Si₃N₄ mix cannot replicate.
Our single-grade specification (TN≥30%) is processed into two physical forms for distinct industrial applications:
Refractory Grade Powder
-200 mesh, 90% pass rate
Gray-white or tea-brown powder for blast furnace taphole clay, iron trough castables, and Al₂O₃-SiC-C refractory mixes. Fe₃Si sintering core densifies the matrix, improves thermal shock resistance, and prevents over-hardening — keeping the taphole easy to open.
Result: Taphole service life extended, iron trough throughput increased, and taphole clay consumption reduced from 1.2kg to 0.5kg per ton of iron.
Steelmaking Grade Granules
1-3mm / 10-50mm
Gray-white granular material for controlled nitrogen alloying in HRB400E rebar and grain-oriented silicon steel. Acts as an efficient microalloying agent, refining grain structure and boosting tensile strength.
Result: In HRB400E production, combining ferro silicon nitride with vanadium-nitrogen alloy replaces high-nitrogen vanadium-iron, reducing alloying cost by ~¥128 per ton of steel.
