Si-C Alloy
A high-carbon silicon alloy that deoxidizes and carburizes in one addition — cheaper and more effective than traditional ferrosilicon and carbon agents.
Silicon-carbon alloy (Si-C alloy), also known as high-carbon silicon, is a new alloy material used in deoxidation and alloying during converter smelting. It improves steel quality and reduces steelmaking cost, and can replace ferrosilicon, silicon carbide, and carburizing agents.
What it is
What Si-C Alloy Is & Where It Is Used
Si-C alloy is a high-strength, wear-resistant, high-temperature and oxidation-resistant material used in metallurgy and casting. It works in induction furnaces, cupolas, LD converters, and ladles for distinct purposes.
It combines deoxidation (silicon) and carbon addition (carbon) in a single additive, replacing multiple auxiliary materials such as ferrosilicon, ferromanganese, and carbon agents — lowering procurement and smelting cost while improving steel quality.
Chemical Composition
Silicon-Carbon Alloy Chemical Composition
FerrumX supplies a full range of Si-C alloy grades. Values are minimum silicon, typical carbon, and maximum sulfur/phosphorus/aluminum:
| Grade | Si (≥, %) | C (%) | S (≤, %) | P (≤, %) | Al (≤, %) |
|---|---|---|---|---|---|
| 6505 | 65 | 5 | 0.1 | 0.1 | 3% max |
| 6510 | 65 | 10 | 0.1 | 0.1 | 3% max |
| 6005 | 60 | 5 | 0.1 | 0.1 | 3% max |
| 6010 | 60 | 10 | 0.1 | 0.1 | 3% max |
| 5505 | 50 | 5 | 0.05 | 0.05 | 3% max |
| 6005 | 60 | 5 | 0.05 | 0.05 | 3% max |
| 6505 | 65 | 5 | 0.05 | 0.05 | 3% max |
| 6010 | 60 | 10 | 0.05 | 0.05 | 3% max |
| 6510 | 65 | 10 | 0.05 | 0.05 | 3% max |
| 6515 | 65 | 15 | 0.05 | 0.05 | 3% max |
| 6815 | 68 | 15 | 0.05 | 0.05 | 3% max |
| 6818 | 68 | 18 | 0.05 | 0.05 | 3% max |
| 6820 | 68 | 20 | 0.05 | 0.05 | 3% max |
Product Features
Product Features
Si-C alloy is engineered for dual deoxidation and stable performance across the melt:
High Deoxidation Efficiency
Silicon forms low-melting SiO₂ that floats out, cutting inclusions; faster than traditional ferrosilicon.
Stable Carbon Addition
Carbon 10–30% precisely replenishes bath carbon; absorption above 85%, avoiding graphite’s unstable uptake.
Improved Steel Quality
Fewer inclusions, less porosity and cracking; refined grain raises strength and toughness.
Significant Cost Advantage
One additive replaces ferrosilicon, ferromanganese, and carbon agents — lower procurement and smelting cost.
Dual Deoxidation, Stable
Equivalent to 75% ferrosilicon at only 3 kg/ton addition.
Slag-Collecting Function
Combines oxides from steelmaking, filtering them out for denser, purer metal.
Services
Services
- Free testing samples: 1–5 kg laboratory samples, or customized particle-size trial samples with pilot production.
- Product particle size range: 10–50 mm briquettes, 0–3 mm / 1–10 mm granules, or customized to the feeding system.
- Standard packaging: 25 kg double-layer bags or ton bags.
FAQ
Si-C Alloy — FAQ
Deoxidation and alloying in converter smelting — it both deoxidizes (silicon) and carburizes (carbon) in one addition across metallurgy and casting.
It gives equivalent deoxidation at ~3 kg/ton and lowers alloy procurement cost per ton of steel by about 30% by replacing several single additives.
Typically above 85%, avoiding the unstable absorption of single carbon agents such as graphite.
A full range from 5505 to 6820 (Si 50–68%, C 5–20%), with controlled S, P, and Al limits.
10–50 mm briquettes, 0–3 / 1–10 mm granules, standard 25 kg bags or ton bags, with free trial samples.
Yes — fewer inclusions, refined grain, and better pass rate on internal NDT for special steels such as plates and structural steel.
Get Started
Specify Your Si-C Alloy Grade
Send your steel grade, furnace type, and target carbon/silicon to FerrumX. The technical team recommends a grade, particle size, and packaging.
Related: Silicon Carbide · Metallurgical Silicon Carbide · Silicon Carbide for Steelmaking · Taphole Clay · Ferrosilicon Nitride
