High-carbon silicon, also known as silicon-carbon alloy (Si-C Alloy) or furnace bottom silicon, is a composite alloy material with silicon (Si) and carbon (C) as its core components. It typically contains small amounts of impurities such as iron, silicon dioxide, phosphorus, and sulfur (which can be reduced to extremely low levels through process control). Its core component ratio is stable, with silicon content usually between 40% and 72%, carbon content between 10% and 24%, and the balance being iron. Different grades of high-carbon silicon adjust the silicon-carbon ratio according to the application. Unlike pure silicon, ferrosilicon, and silicon carbide, high-carbon silicon is produced by high-temperature smelting of raw materials such as quartz, coke, and scrap steel in an electric arc furnace. Some products can also be used as byproducts in the production of metallic silicon, achieving efficient resource utilization and further reducing production costs. It is mostly grayish-black in shape, hard in texture, with a melting point of approximately 2700℃. It exhibits stable performance at high temperatures and possesses the dual core functions of deoxidation and carburization.
Core Characteristics of High-Carbon Silicon
Dual Function, Higher Efficiency: It functions as both a deoxidizer and a carbon raiser. During steelmaking, it reacts with oxygen in molten steel, effectively removing oxygen and improving steel purity, while also stably replenishing carbon. No additional carbon raiser is needed, simplifying the smelting process and shortening the production cycle.
Significant Cost Advantage: Typically 20%–40% cheaper than ferrosilicon and silicon carbide, it can partially or completely replace both without affecting product quality. This significantly reduces alloy consumption and overall production costs, making it particularly suitable for large-scale steel smelting and casting enterprises.
Stable Performance, Strong Controllability: Moderate deoxidation speed and stable reaction avoid the problems of excessively rapid ferrosilicon reaction and uncontrollable silicon carbide reaction. It effectively reduces slag formation, improves carbon recovery, and has a uniform composition. The silicon-carbon ratio and particle size can be customized to meet the production needs of different steel grades and castings.
Energy-saving and environmentally friendly, in line with current trends: Production energy consumption is lower than ferrosilicon and silicon carbide, and energy loss is reduced during smelting, lowering emissions of waste gas and slag. Furthermore, the slag produced during deoxidation can be reused, meeting the requirements of modern green and low-carbon industrial development and helping enterprises achieve environmental compliance.
Wide adaptability and strong weather resistance: Chemically stable, resistant to acids, alkalis, and high-temperature gas corrosion, maintaining stable performance even in harsh smelting environments. It also possesses good thermal conductivity, making it suitable as an auxiliary material in high-temperature applications, and is compatible with various processes such as converters, electric arc furnaces, and cast iron inoculation.
High-carbon silicon vs. ferrosilicon vs. silicon carbide: Why is high-carbon silicon more cost-effective?
|
Material Types |
Silicon content(%) |
|
40~72 |
|
|
FeSi |
65~75 |
|
SiC |
50~70 |
If you need to purchase high-carbon silicon, or want to learn more about product details (composition parameters, test reports, cooperation cases, delivery cycle), please contact us immediately to start an efficient and cost-effective procurement journey:
✅ Inquiry method: Leave a message directly, and we will contact you within 24 hours.
✅ Free Benefits: Leave a message to receive a detailed parameter table of high-carbon silicon, a third-party testing report, and free samples.
✅ Dedicated Service: We provide one-on-one procurement solutions, recommending suitable high-carbon silicon grades and particle sizes based on your production needs to help you further reduce production costs.
