High Carbon Silicon Alloy | Si 60-68% C 15-20%

 

High Carbon Silicon Alloy, also called silicon carbon alloy or high carbon silicon, is a Si-C metallurgical material used in steelmaking where silicon and carbon need to be introduced together.

The current product range includes three reference compositions: Si 68% min / C 18% min, Si 65% min / C 15% min, and Si 60% min / C 20% min. All three grades currently list P 0.05% max, S 0.01% max and Al 3.0% max.

Available reference particle sizes are 0–10 mm, 10–50 mm and 10–100 mm. If your furnace requires another size range or a specific fines / oversize tolerance, include that requirement in the inquiry before quotation.

High Carbon Silicon Alloy

 

High carbon silicon combines silicon and carbon in one metallurgical material. It can be used where your process requires both a silicon-bearing addition and carbon input during steelmaking.

Silicon Addition

Silicon participates in deoxidation reactions in molten steel and can also contribute to the target silicon content of the final steel chemistry.

Carbon Addition

The carbon content allows the same material to contribute carbon during the metallurgical process. The required addition rate should be calculated from your starting melt chemistry and target composition.

Combined Si-C Addition

Where your process would otherwise use separate silicon-bearing and carbon-bearing materials, high carbon silicon can provide both elements in one charge material.

The correct grade should therefore be selected according to your required Si/C balance rather than simply choosing the grade with the highest silicon or carbon percentage.

 

Grade	Si Min.	C Min.	P Max.	S Max.	Al Max.
HC Si 68/18	68%	18%	0.05%	0.01%	3.0%
HC Si 65/15	65%	15%	0.05%	0.01%	3.0%
HC Si 60/20	60%	20%	0.05%	0.01%	3.0%

If your internal specification uses a different Si/C ratio or tighter P, S or Al limits, send the required chemistry before quotation.

 

Si 68% / C 18%

This grade provides the highest minimum silicon level among the current three reference specifications while maintaining C 18% min.

Si 65% / C 15%

This grade uses a lower minimum carbon level than the other two current options. It can be considered where your process requires Si 65% min while limiting the amount of carbon introduced per unit of material.

Si 60% / C 20%

This grade provides the highest minimum carbon level in the current table and the lowest minimum silicon level among the three options.

The appropriate specification depends on how much Si and C your melt actually needs. Compare the required addition of both elements before selecting a grade.

 

Specification	Si Min.	C Min.	Main Selection Point
68 / 18	68%	18%	Higher Si requirement within the current product range
65 / 15	65%	15%	Lower carbon input within the current three reference grades
60 / 20	60%	20%	Higher carbon input with lower minimum Si

 

Silicon-carbon alloy can be used as a composite deoxidizing material in steelmaking. Silicon reacts with dissolved oxygen during the metallurgical process, while the material also introduces carbon.

Why Chemistry Control Matters

The deoxidation function does not mean every silicon-carbon alloy can be used interchangeably. Si/C ratio, P, S and Al should still match your steelmaking specification.

Calculate the Addition from Your Melt

The amount of high carbon silicon required depends on your initial steel chemistry, target Si and C levels, furnace practice and other alloy additions.

For this reason, dosage should be determined from your own metallurgical calculation rather than from one fixed universal addition rate.

 

The main purchasing difference is that high carbon silicon supplies both Si and C in the same material.

Option	What It Adds	What You Need to Control
High Carbon Silicon	Silicon + carbon in one material	Si/C ratio plus P, S and Al
Separate Silicon Addition	Primarily silicon according to the selected material	Silicon requirement and associated impurities
Separate Carbon Addition	Primarily carbon according to the selected material	Carbon addition and impurity limits

Which route is more suitable depends on your target steel chemistry and furnace practice. High carbon silicon should not be selected only because it combines two elements; the combined Si/C ratio must also fit the process.

 

The current product information lists three reference particle-size ranges:

Size	Selection Consideration
0–10 mm	Smaller particle range where your feeding system requires finer material
10–50 mm	Medium lump range for applicable metallurgical charging systems
10–100 mm	Broader lump-size range where larger material is acceptable

Define Fines and Oversize if Important

If your process limits undersize or oversize particles, include the required tolerance in the RFQ. A nominal size range alone does not define the complete receiving standard.

 

Steelmaking Deoxidation

High carbon silicon can be used as a silicon-bearing deoxidizing material where its Si/C balance matches your process.

Silicon and Carbon Adjustment

The material can also be used where both silicon and carbon need to be adjusted during steel production.

Metallurgical Charge Material

Different lump sizes allow the material to be selected according to your charging and handling requirements.

For each application, the actual grade and dosage should be based on the required steel chemistry rather than on the generic product name alone.

 

The material should be stored under suitable dry conditions and kept clearly identified by grade and batch so the correct Si/C specification can be traced during use.

 

Check Silicon and Carbon Together

Because this product supplies both elements, Si and C should be checked together when the batch is accepted.

Check P, S and Al

The current reference specification lists P 0.05% max, S 0.01% max and Al 3.0% max for all three grades.

Check Particle Size

Confirm that the delivered particle-size range matches the purchase specification and any agreed fines / oversize tolerance.

Batch COA

If your quality procedure requires a batch COA, include that requirement before order confirmation so the delivered chemistry can be compared with the agreed specification.

 

 

For high carbon silicon orders, we confirm the required Si/C grade, particle size, quantity and quality requirements before supply.

Stable Supply

The current supply reference is approximately 3,000 MT per month. Actual availability should be confirmed according to grade, size and order schedule.

Inspection Support

Chemical specification and particle-size requirements should be confirmed before shipment. If you require specific inspection documents or third-party verification, include them in the RFQ.

Samples

Samples can be discussed for chemical analysis or material evaluation before a bulk order. Send the required grade and particle size so the correct sample can be prepared.

 

The current source information does not provide a complete fixed packing specification or MOQ for every high carbon silicon order. These items should be confirmed according to your grade, particle size and quantity.

Delivery Time

The current page gives 7–15 days as a reference delivery period after payment. Final shipment timing still depends on current stock, grade, size, quantity, packing and logistics arrangement.

Destination and Trade Term

Provide the destination port and required Incoterm so freight and quotation terms can be calculated on the correct basis.

 

Comparison Item	What to Check
Si	60%, 65% or 68% minimum
C	15%, 18% or 20% minimum depending on grade
Impurities	P, S and Al limits
Particle Size	0–10 / 10–50 / 10–100 mm or agreed custom range
Packing	Net weight and export packing basis
Quality Documents	COA or agreed inspection requirement
Commercial Basis	Quantity, destination and Incoterm

 

• Grade: Si 68 / C 18, Si 65 / C 15, Si 60 / C 20 or another required chemistry.
• Impurities: required P, S and Al limits.
• Particle Size: 0–10 mm, 10–50 mm, 10–100 mm or another range.
• Size Tolerance: fines and oversize limits if controlled.
• Quantity: required metric tons.
• Application: deoxidation, Si/C adjustment or another metallurgical use.
• Packing: required packing format and net weight.
• Destination: destination port.
• Incoterm: FOB / CFR / CIF or another agreed term.
• Documents: COA or other required inspection documents.

 

 

Send us your required Si and C content, P / S / Al limits, particle size, quantity and destination port.

If your furnace requires a specific fines or oversize tolerance, batch COA or other inspection condition, include those requirements in the inquiry.

We will confirm the applicable high carbon silicon grade, size and current supply conditions before preparing the quotation.

Request High Carbon Silicon Quote