Product Overview

Silicon Carbide 75% for Foundry Casting is an industrial-grade silicon carbide material containing a minimum of 75% SiC. It is used as a source of silicon and carbon in selected cast iron melting processes, including gray iron and ductile iron production.

SiC 75 is supplied as black or dark-gray granular material. Its main chemical indicators include silicon carbide content, free carbon, Fe₂O₃ and moisture. These properties, together with particle size, determine whether the material meets the requirements of a particular foundry process.

Available sizes include 0–1 mm, 1–3 mm, 0–5 mm, 3–5 mm and 5–10 mm. Customized particle sizes can be discussed according to the melting equipment and addition method.

Silicon Carbide 75% Technical Specifications

When selecting SiC 75 for foundry casting, you should review the complete chemical composition rather than relying only on the SiC percentage.

The following table shows the reference specifications listed for this product.

Specification Note: These are reference values from our listed SiC 75 specification. Final chemical limits, particle-size distribution and inspection requirements should be confirmed for your order.

Understanding the Chemical Composition

In addition to the minimum 75% SiC content, several indicators are important when evaluating silicon carbide for cast iron production:

• Free Carbon: Carbon that is not chemically combined within SiC. It should be distinguished from the carbon contained in the silicon carbide compound itself.
• Fe₂O₃: An iron oxide indicator included in the listed impurity specification.
• Moisture: An important consideration for material handling and charging.
• Additional Impurities: Silica-related residue and other elements may need to be checked according to your melt specification.

If your foundry requires additional chemical limits, please provide the relevant specifications so we can review the requirements before quotation.

Main Applications of Silicon Carbide 75% in Foundry Casting

Silicon carbide can contribute silicon and carbon during cast iron melting. Its suitability depends on the base iron chemistry, addition method and required final composition.

Gray Iron Casting

In gray iron casting, Silicon Carbide 75% can be considered as a source of silicon and carbon during melting.

Under suitable conditions, SiC additions may influence graphite nucleation and the resulting cast iron microstructure. The actual effect depends on the initial iron composition, melting temperature, addition rate and subsequent inoculation treatment.

When evaluating SiC 75 for gray iron, you should confirm:

• The required silicon and carbon contribution.
• The acceptable free carbon and impurity limits.
• The particle size suitable for your charging method.
• The existing inoculation and melt treatment process.

We recommend selecting the grade and particle size according to your actual melting requirements rather than assuming that the same addition rate will work in every furnace.

Ductile Iron Casting

For ductile iron production, Silicon Carbide 75% may be used as a silicon and carbon additive when its chemical composition is compatible with the required melt specification.

The material should be evaluated together with the base iron composition and the foundry’s nodularizing and inoculation practices.

Silicon carbide does not replace magnesium treatment or other necessary steps used to produce spheroidal graphite in ductile iron.

Before purchasing SiC 75 for ductile iron, you should check whether the listed impurity limits, available particle sizes and expected element recovery meet your production requirements.

Foundry Melt Chemistry Adjustment

SiC 75 can also be considered during melt chemistry adjustment when both silicon and carbon contributions are relevant to the charge calculation.

The amount of silicon and carbon introduced into the melt depends on the material composition and process conditions. Therefore, the required addition rate should be calculated according to your target chemistry and expected recovery.

For consistent production, you should evaluate chemical composition, particle-size distribution and batch quality together.

SiC 75 vs SiC 70: What Should Foundries Consider?

Both SiC 70 and SiC 75 can be considered for selected industrial foundry applications, but their minimum silicon carbide contents differ.

SiC 75 contains at least 75% silicon carbide, while Silicon Carbide 70% contains at least 70%.

A higher minimum SiC content may be useful when your process requires a greater proportion of silicon carbide in the purchased material. However, it does not automatically guarantee better casting quality or higher element recovery.

When comparing the two grades, you should consider:

• Effective SiC Content: The amount of silicon carbide supplied by each grade.
• Impurity Limits: Free carbon, iron oxide and other relevant components.
• Melting Conditions: Addition method, furnace operation and expected recovery.
• Purchasing Cost: Price relative to usable SiC content and the total material requirement.

If your foundry requires higher minimum SiC content, you can also review our Silicon Carbide (SiC) 88% / 90% specifications.

The most suitable grade is the one that meets your chemical and production requirements at an acceptable total procurement cost.

Silicon Carbide 75% Particle Sizes

Particle size can affect how SiC 75 is handled, charged and incorporated into molten iron. The appropriate size depends on your furnace equipment and addition method.

Our listed sizes include:

• 0–1 mm
• 1–3 mm
• 0–5 mm
• 3–5 mm
• 5–10 mm
• Customized sizes upon request

When selecting the particle size, consider your furnace charging system, handling equipment, processing conditions and acceptable fines content.

If your foundry requires a specific size distribution, please provide the required range and tolerance so we can review the available material.

Packaging and Storage

Export Packaging

We offer packaging options for different foundry purchasing and handling requirements.

• 25 kg woven bags: Suitable for orders requiring smaller handling units.
• 1 MT jumbo bags: Commonly used for bulk industrial purchasing.
• Customized packaging: Can be discussed according to your shipment and receiving requirements.

Before confirming an order, please specify your preferred package weight, unloading arrangements and any additional labeling or handling requirements.

Storage Recommendations

Silicon Carbide 75% should be stored in a clean, dry and covered area to reduce unnecessary moisture exposure and contamination.

Keep the packaging protected from physical damage and confirm its condition before charging the material into the furnace.

For extended storage, the receiving facility should follow the agreed handling and storage requirements.

Quality Control and Supply Support

At ZHENAN, we supply Silicon Carbide 75% for foundry customers with different chemical composition, particle-size and packaging requirements.

Before confirming your order, we can review the agreed quality requirements, including:

• SiC Content: Minimum silicon carbide content required for your application.
• Free Carbon: Compliance with the agreed maximum limit.
• Fe₂O₃ and Other Impurities: Review of relevant chemical limits.
• Moisture: Confirmation of the specified limit where required.
• Particle Size: Agreement on the required size distribution.
• Packaging: Verification of the selected packing arrangement.

If you need a certificate of analysis (COA), batch-specific inspection documents or third-party testing, please tell us your requirements so we can confirm the available arrangements.

What Should You Confirm Before Ordering SiC 75 for Foundry Casting?

To prepare a quotation that matches your production requirements, please provide the following information:

• Casting Type: Gray iron, ductile iron or another casting application.
• Chemical Requirements: Minimum SiC content, free carbon and other impurity limits.
• Particle Size: Required size range and acceptable fines content.
• Order Quantity: Required quantity in metric tons.
• Packaging: Preferred bag type and package weight.
• Destination: Destination port or delivery location.
• Documentation: COA and any additional inspection requirements.

With these details, we can review the applicable specification, available supply and quotation conditions for your foundry purchase.

Frequently Asked Questions About SiC 75 for Foundry Casting

What is Silicon Carbide 75% for Foundry Casting used for?

Silicon Carbide 75% can be used as a source of silicon and carbon in selected cast iron melting processes, including gray iron and ductile iron production. Its suitability depends on melt chemistry, impurity limits and furnace conditions.

Why choose Silicon Carbide 75% instead of lower grades?

SiC 75 provides a higher minimum silicon carbide content than grades such as SiC 70. It may be preferred when this higher content better matches your foundry requirements. Actual performance and cost should be evaluated using the complete specification and production conditions.

What sizes are available for Silicon Carbide 75%?

Our listed sizes include 0–1 mm, 1–3 mm, 0–5 mm, 3–5 mm and 5–10 mm. Customized particle sizes can also be discussed according to your application.

Is Silicon Carbide 75% suitable for ductile iron foundry use?

SiC 75 may be suitable for ductile iron melting when its chemical composition meets your requirements. It should be evaluated together with the base iron chemistry, nodularizing treatment and inoculation practice. It does not replace magnesium treatment.

Do you support bulk supply?

Yes. We support bulk industrial inquiries and long-term purchasing arrangements. Please provide your required quantity, particle size and destination so we can confirm the available supply conditions.

What packing options are available?

Our listed options include 25 kg woven bags and 1 MT jumbo bags. Customized packaging can also be discussed according to your handling and shipment requirements.

When we receive your request, we will send you our personal catalog, price list, delivery terms, payment terms, and other necessary detailed information via email within 24 hours.

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