Product Overview

Silicon Carbide (SiC) 88% / 90% is a metallurgical-grade silicon carbide material primarily used as a deoxidizing additive and a source of silicon and carbon in steelmaking and cast iron production. It is typically supplied as black granules or powder for industrial furnace applications.

SiC 88 contains a minimum of 88% silicon carbide, while SiC 90 contains at least 90%. Compared with SiC 88, SiC 90 has higher SiC content and lower specified limits for free carbon and Fe₂O₃, making it an option for applications requiring tighter chemical specifications.

Available particle sizes include 0–10 mm, 1–10 mm, and 200–325 mesh powder. Customized sizes and briquette forms can also be discussed according to application requirements.

Silicon Carbide (SiC) 88% / 90% Specifications

The main differences between SiC 88 and SiC 90 are their minimum silicon carbide content and maximum specified impurity limits. Both grades can be considered for metallurgical applications, depending on your required chemical composition and operating conditions.

Other available grade: SiC 80 can also be discussed for applications requiring a different specification. Our listed SiC 80 grade contains SiC ≥ 80.0%, free carbon ≤ 5.0%, and Fe₂O₃ ≤ 4.0%.

Specification Note: The values above represent our listed grade specifications. Final chemical composition limits, particle sizes and inspection requirements should be confirmed before ordering. Additional impurity requirements, such as SiO₂ and moisture limits, can be reviewed according to your application.

SiC 88 vs SiC 90: Which Grade Should You Choose?

Both SiC 88 and SiC 90 are used in metallurgical applications where silicon carbide serves as a source of silicon and carbon. The appropriate grade depends on your production process, impurity tolerance, target chemical composition and purchasing requirements.

Silicon Carbide 88%

SiC 88 contains at least 88% silicon carbide, with free carbon limited to 4.0% and Fe₂O₃ limited to 3.0% in our listed specification.

It can be considered for steelmaking and foundry operations where these chemical limits meet the required material specification. When cost is an important purchasing factor, SiC 88 can be compared with higher-content grades based on the same particle size, quantity and delivery conditions.

Silicon Carbide 90%

SiC 90 contains at least 90% silicon carbide, with free carbon limited to 3.0% and Fe₂O₃ limited to 2.5% in our listed specification.

Compared with SiC 88, this grade provides higher minimum SiC content and lower specified impurity limits. It may be preferred when your metallurgical process requires tighter chemical control.

Which grade is suitable for your process? The choice should be based on your required chemical composition, impurity limits, addition method and production conditions. A higher SiC percentage does not automatically mean better performance in every application.

Main Applications of Silicon Carbide 88% / 90%

1. Steelmaking Deoxidizer

In steelmaking, metallurgical silicon carbide can be used as a deoxidizing additive and a source of silicon and carbon. Under suitable furnace conditions, SiC reacts within the molten metal and contributes to the metallurgical process.

SiC 88 and SiC 90 may be used to:

• Support deoxidation during selected steelmaking operations.
• Supply silicon as part of the required alloy-addition practice.
• Contribute carbon where the target steel composition allows it.
• Adjust the combination of silicon-bearing and carbon-bearing additives used in production.

In some production processes, silicon carbide may partially replace other silicon-bearing materials, including ferrosilicon.

However, SiC 88/90 is not a direct weight-for-weight replacement for FeSi75. The actual addition amount should be determined by the silicon and carbon balance, expected recovery and operating conditions.

2. Foundry and Cast Iron Production

In the foundry industry, SiC 88 and SiC 90 can be used as silicon and carbon additives during cast iron melting.

Depending on the melting conditions and chemical composition, silicon carbide additions may influence graphite nucleation and the resulting cast iron microstructure.

For gray iron and ductile iron production, the effects depend on several factors, including:

• Initial molten iron composition.
• Silicon carbide grade and particle size.
• Addition rate and melting conditions.
• Existing inoculation and treatment processes.

When evaluating silicon carbide for foundry applications, you should select the grade according to your melt chemistry and production requirements rather than assuming the same addition practice will produce identical results in every furnace.

3. Refractory Raw Material Applications

Silicon carbide is also used in selected refractory and wear-resistant products because of its hardness, thermal properties and resistance to thermal shock.

Applications may include refractory components and materials used in high-temperature industrial environments.

However, refractory manufacturing may require different purity levels, particle-size distributions and technical specifications from metallurgical deoxidizer grades.

If your application involves refractory production, please specify the required chemical composition, particle size and intended product so that the appropriate material specifications can be reviewed.

Why Choose ZHENAN Silicon Carbide 88/90?

Specified Chemical Composition

We supply SiC 88 and SiC 90 with clearly listed minimum silicon carbide content and maximum free carbon and Fe₂O₃ limits.

You can confirm the required grade, impurity limits and relevant quality documentation before placing an order.

Silicon and Carbon in One Material

Silicon carbide contains chemically combined silicon and carbon, making it a useful metallurgical additive where both elements are required.

Under suitable production conditions, SiC can contribute silicon and carbon to the molten metal. Actual recovery depends on the furnace process, material composition and addition method.

Multiple Particle Size Options

We offer granular and powder forms of silicon carbide for different industrial handling and addition requirements.

Available standard sizes include 0–10 mm, 1–10 mm and 200–325 mesh powder. Custom particle sizes and briquette forms can also be discussed according to your requirements.

Packaging and Quality Documentation Support

We can review your required grade, particle size, packaging and quality documentation before confirming the order.

If your purchasing procedure requires chemical analysis documentation or additional third-party inspection, please contact us to discuss the available arrangements.

Available Sizes and Export Packaging

Particle size affects how silicon carbide is handled and introduced into the furnace. The appropriate size range depends on your equipment, addition method and production process.

If your furnace requires a specific size distribution, please provide the target particle-size range and acceptable fines content.

Packaging can be confirmed according to your order quantity, handling requirements and destination.

What Should You Confirm Before Ordering SiC 88/90?

When purchasing silicon carbide 88% or 90%, you should confirm that the chemical specification, particle size and commercial conditions meet your actual production requirements.

To prepare an accurate quotation, please provide:

• SiC Grade: SiC 88% or SiC 90%.
• Chemical Requirements: Minimum SiC content and maximum impurity limits.
• Particle Size: Required granular or powder size.
• Application: Steelmaking, cast iron production or refractory manufacturing.
• Order Quantity: Required quantity in metric tons.
• Packaging: Jumbo bags, small bags or other requirements.
• Destination: Delivery location or destination port.
• Documentation: COA or additional inspection requirements, if applicable.

With these details, we can review the applicable SiC 88/90 specification, available supply and quotation conditions for your purchase.

Frequently Asked Questions About SiC 88 and SiC 90

What is the difference between SiC 88 and SiC 90?

SiC 88 contains at least 88% silicon carbide, while SiC 90 contains at least 90%. In our listed specifications, SiC 90 also has lower maximum limits for free carbon and Fe₂O₃. You should compare the complete chemical requirements before choosing a grade.

Can silicon carbide 88/90 replace ferrosilicon in steelmaking?

In some steelmaking processes, SiC 88/90 may partially replace other silicon-bearing additives. However, it is not a direct weight-for-weight substitute for FeSi75 because the chemical composition and silicon and carbon recovery differ. The addition plan should be determined by your furnace conditions and target steel chemistry.

What particle sizes are available for SiC 88/90?

Our listed sizes include 0–10 mm, 1–10 mm and 200–325 mesh powder. Custom particle sizes and briquette forms can be discussed according to your application.

Can I request chemical analysis or third-party testing?

You can contact us to discuss chemical analysis documentation and third-party testing requirements. Please specify the grade, impurity limits and inspection items you need so we can confirm the available arrangements.