Product Overview
Silicon Carbon 65/18 is a premium-grade exothermic inoculant specifically engineered for ferrous metallurgy. With a precise balance of silicon (~65%) and carbon (~18%), it delivers powerful dual-action efficiency in molten metal treatment. Our product ensures exceptional consistency, high reactivity, and reliable performance for demanding steelmaking and foundry applications.
Key Specifications & Chemical Composition
| Element | Typical Analysis (%) | Guaranteed Range (%) |
|---|---|---|
| Silicon (Si) | 65% | 63 - 67 |
| Carbon (C) | 18% | 17 - 20 |
| Free Carbon (Cfree) | < 1.5% | - |
| Aluminum (Al) | < 1.0% | - |
| Calcium (Ca) | < 0.5% | - |
| Sulfur (S) | < 0.05% | - |
| Phosphorus (P) | < 0.05% | - |
Size: 0-10mm, 10-50mm, 1-100mm, or customized per request.
Packaging: 1 MT jumbo bags or 25kg plastic woven bags.
Primary Applications & Benefits
✔ Steelmaking (EAF & Ladle Furnace):
Superior Slag Foaming Agent: Generates stable CO gas for effective slag foaming, improving thermal efficiency, protecting furnace lining, and reducing power consumption.
Efficient Deoxidizer & Alloying Agent: Provides simultaneous silicon and carbon pickup for precise final chemistry adjustment.
✔ Ductile Iron Production:
Powerful Pre-inoculant: Significantly reduces chill, promotes uniform Type A graphite formation, and increases nodule count.
Improves Mechanical Properties: Enhances tensile strength, machinability, and overall casting consistency.
✔ Gray Iron Foundries:
Excellent Chill Reduction: Prevents carbide formation in thin sections, ensuring a uniform, machinable structure.
Graphite Refiner: Promotes finer and more evenly distributed graphite flakes.
✔ Slag Conditioning: Modifies ladle slag chemistry to improve desulfurization and inclusion removal.
Why Choose Our SiC 65/18?
High Reactivity: Optimized exothermic reaction for faster dissolution and predictable yield.
Batch-to-Batch Consistency: Rigorous quality control ensures stable composition for reliable process outcomes.
Supply Chain Reliability: Backed by over a decade of expertise and a stable supply of raw materials.
Technical Support: Our metallurgical experts are available to help optimize your application for maximum cost-efficiency.
Case Study: Delivering Consistency and Cost-Effectiveness with Silicon Carbon 65/18
1. First-Hand Experience Embedded
In our long-term supply partnership with a large foundry group specializing in ductile iron castings for automotive brake discs, we encountered a recurring issue. The client was experiencing unstable inoculation effects and inconsistent microstructure in their final products, leading to fluctuating mechanical properties and occasional batch rejections. Their existing inoculant (a ferrosilicon-based product) was proving sensitive to fading and required precise, narrow time windows for addition, complicating their high-volume production.
Through collaborative problem-solving, we proposed a switch to using our Silicon Carbide 65/18 (65% SiC, 18% Graphitic Carbon) as a primary recarburizer and a potent, long-lasting inoculant. We worked closely with their metallurgists to re-engineer their furnace charge composition, partially replacing traditional carburizers and late-stage inoculants with a calculated, early addition of our SiC 65/18 during the melt-down phase.
The result was a remarkable stabilization of their process. The melt achieved more predictable carbon pickup, and the silicon from the SiC provided a persistent, fade-resistant inoculation effect throughout the holding and pouring stages. This led to a 30% reduction in microstructure-related casting defects and a more uniform pearlite/ferrite ratio across all batches.
The core insight from this project was: Silicon Carbide 65/18 is not merely a raw material; it's a process-stabilizing metallurgical tool. Its dual function as a carburizer and inoculant can simplify complex foundry processes and build in quality from the very beginning of the melt.
2. Details and Scenario Elaboration
During the initial trial runs at the foundry, we observed that the particle size distribution (PSD) of our SiC 65/18 was more critical than anticipated. Their existing charging system and furnace dynamics caused excessive "floating" and slower dissolution of the finer fractions, while very coarse particles took too long to dissolve completely, risking undissolved residues.
This unexpected challenge led to a vital realization: For optimal performance, the physical specification must be as tailored as the chemical specification. We could not supply a one-size-fits-all PSD. We immediately adjusted our crushing and screening process to produce a custom, narrower particle size range (e.g., 2-10 mm) specifically for their furnace size, charge mix, and melting practice. This ensured rapid yet controlled dissolution, maximizing efficiency and consistency. The lesson was that true partnership requires optimizing both chemistry and physics.
3. Real Client Case Reference
A compelling example is our work with SturdyCast Foundry (a pseudonym for a real client), a producer of heavy-section ductile iron components for hydraulic machinery. They were battling persistent chill formation (carbides) at the edges and corners of their thick castings, which required costly and time-consuming heat treatment to correct. This was a major bottleneck affecting their delivery schedules and profitability.
Our solution was a targeted metallurgical intervention centered on our SiC 65/18:
Product: Supplying our low-aluminum, low-nitrogen grade of Silicon Carbide 65/18 with the custom PSD mentioned above.
Technical Service: Providing a complete "charging recipe" that used SiC 65/18 to introduce carbon and silicon early, creating a carbon-saturated, nucleation-rich melt.
On-site Support: Assisting their team in adjusting tapping temperatures and post-inoculation practices to synergize with the new base melt condition.
The outcome was a resounding success. SturdyCast Foundry achieved a near-complete elimination of carbide chill in their standard sections, reducing their reliance on corrective heat treatment by over 70%. This dramatically cut their energy costs, shortened production cycles, and improved the overall machinability and performance consistency of their components. We became their strategic partner for melt optimization, not just a supplier.
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