6515 High Carbon Silicon For Steelmaking

6515 high carbon silicon used for steelmaking usually refers to carbon silicon alloy, in which the silicon content is about 65% and the carbon content is about 15%. It is mainly composed of silicon (Si) and carbon (C), and may contain a small amount of aluminum (Al), calcium (Ca), iron (Fe) and other elements, as well as trace amounts of manganese (Mn), phosphorus (P), sulfur (S) and other impurities. It is usually in lump or granular form, with a silver-gray metallic luster on the surface. It has good oxidation resistance and corrosion resistance, can remain stable at high temperatures, and has a low expansion coefficient and good thermal stability.

It is suitable for the smelting of various types of steel, including ordinary carbon steel, high-quality carbon steel, alloy structural steel, aluminum static steel, welding bottle steel, medium carbon alloy structural steel, weathering steel, etc.

High cost-effectiveness:

It can partially replace relatively expensive traditional deoxidizers such as ferrosilicon and calcium carbide. It can simultaneously deoxidize, increase silicon and increase carbon, reducing the use of multiple additives, thereby reducing the cost of steelmaking.

Good comprehensive performance:

It not only has strong deoxidation ability, but also improves the fluidity of molten steel and makes the molten steel purer. Its slag collection effect is significant, which can quickly aggregate oxides in the steelmaking process, facilitate filtering and treatment, and improve the quality and density of steel. Traditional deoxidizers may only focus on the deoxidation function, and the improvement of other properties of molten steel is relatively limited.

Stable recovery rate:

It has stable physical and chemical properties, high density, high purity, and can maintain a high and stable recovery rate during the steelmaking process. This makes the composition control in the steelmaking process more accurate and reduces the problem of unstable steel quality caused by fluctuations in the recovery rate of the deoxidizer. In contrast, some traditional deoxidizers such as aluminum are prone to react with oxygen in the air during the steelmaking process, resulting in unstable actual recovery rates and affecting the quality control of steel.

Environmental protection advantages:

During production and use, 6515 HC silicon produces relatively few pollutants. It does not pollute molten steel, reduces the generation and emission of harmful substances during steelmaking, and meets the environmental protection requirements of the modern steel industry. Traditional deoxidizers such as calcium carbide will produce harmful gases such as acetylene during use, causing certain pollution to the environment.

Deoxidation:

During the steelmaking process, a certain amount of oxygen is inevitably present in the molten steel. The presence of oxygen can severely affect the steel's quality, reducing its strength and toughness and causing defects such as porosity and looseness. The silicon in 6515 high-carbon silicon has a strong affinity for oxygen, rapidly reacting chemically to form silicon dioxide (SiO₂). The chemical reaction equation is: Si + O₂ = SiO₂. The resulting silicon dioxide has a low density and rises to the surface of the molten steel as slag, effectively removing it and deoxidizing the steel, significantly improving its purity and quality.

Carburization:

Carbon is a key element in determining steel's properties. Steels with different carbon contents exhibit distinct performance characteristics. The carbon in 6515 high-carbon silicon plays a crucial role in steel grades that require a higher carbon content to enhance strength, hardness, and other properties. During the steelmaking process, unoxidized carbon dissolves in the molten steel, effectively increasing the steel's carbon content to meet the carbon content requirements of specific steel grades, thereby optimizing the steel's performance, such as improving the strength and wear resistance of structural steel.

Alloying Effect:

In addition to deoxidation and carburization, 6515 high-carbon silicon can also be added to steel as an alloying element, significantly altering its microstructure and properties. Silicon dissolved in ferrite produces solid solution strengthening, increasing the steel's strength and hardness while also enhancing its elasticity. When producing high-strength alloy steels, spring steels, and other grades, the appropriate addition of 6515 high-carbon silicon precisely adjusts the steel's chemical composition, resulting in improved overall performance and meeting the stringent requirements for steel performance in various applications.

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