High Carbon Ferro Silicon

High-Efficiency Silicon Source for Global Steelmaking, Casting & Alloy Production

High Carbon Ferro Silicon (also known as Silicon-Carbon Alloy) is a high-performance, cost-effective silicon-iron alloy widely utilized in converter steelmaking, EAF (Electric Arc Furnace) refining, and foundry industries.

Actively serving as a dual-functional deoxidizer and carburizer, HC FeSi is the preferred choice for global procurement teams seeking to optimize alloying costs, stabilize silicon recovery, and maintain precise control over molten steel cleanliness.

Compared with traditional ferrosilicon grades (such as FeSi 75 or FeSi 72), HC FeSi introduces a controlled carbon content (0.5% - 2.0%, or customizable higher ranges). This unique chemical matrix accelerates the exothermic reaction in the ladle, reduces energy consumption, and ensures predictable batch-to-batch metallurgical performance.

Technical Specifications & Global Standard Compliance

To meet the stringent quality requirements of international steel mills (including compliance with ASME, ASTM, and ISO 9001:2015 frameworks), our High Carbon Ferro Silicon is produced under strict thermochemical control.

Chemical Composition (Typical Guarantees)

Element	Reference Range (Standard Grade)	Premium Low-Al Grade	Verification Method
Silicon (Si)	70.0% – 75.0%	72.0% – 76.0%	XRF / ICP-OES Spectroscopy
Carbon (C)	0.5% – 2.0% (customizable up to 3.0%)	1.0% – 2.0%	Infrared Carbon-Sulfur Analyzer
Aluminum (Al)	≤ 1.5%	≤ 1.0% or ≤ 0.8%	Chemical Titration / ICP
Phosphorus (P)	≤ 0.04%	≤ 0.035%	Spectrometric Analysis
Sulfur (S)	≤ 0.02%	≤ 0.015%	Infrared Combustion
Iron (Fe)	Balance	Balance	By Difference

Precision Particle Size Distribution

Different furnace charging systems and automation setups require strict size control to minimize material loss through flue gas entrainment.
We supply:

0–3 mm / 1–3 mm	Ideal for ladle injection systems and tundish additions
3–10 mm	Optimized for foundry cupola furnaces and automatic alloy feeding systems
10–50 mm / 10–60 mm	Standard grade for EAF (Electric Arc Furnace) and BOF (Basic Oxygen Furnace) batch charging
Custom Screening	Tailored mesh sizes available upon request, with fines (< bottom size) controlled under 5%

Solutions for Core Metallurgical & Procurement Challenges

Industrial manufacturers and global procurement teams consistently operate under tight cost constraints and strict steel cleanliness requirements. Our HC FeSi is engineered to address three critical operational challenges:

Eliminating Fluctuation in Silicon Yield (Stable Recovery Rate)

The Problem:
Inconsistent silicon recovery forces metallurgists to over-alloy, increasing costs and causing unstable mechanical properties (such as variations in tensile strength in spring steels and wear-resistant grades).
Our Solution:
The co-presence of carbon and silicon in the alloy helps shield silicon from premature oxidation in the slag phase. This synergistic reaction enables a stable silicon recovery rate of 80% – 88% in the ladle, improving heat-to-heat consistency.

Aggressive Cost Reduction Under Tight Steel Margins

The Problem:
Relying solely on standard FeSi 75 combined with expensive low-nitrogen carburizers increases total alloy cost per ton of molten steel.
Our Solution:
Replacing a calculated portion of conventional ferrosilicon with HC FeSi enables simultaneous silicon and carbon addition. This dual-function efficiency reduces total alloying costs by up to 15% – 25% per ton of treated steel, without compromising metallurgical cleanliness.

Mitigating Impurity-Induced Casting Defects

The Problem:
Excess aluminum content (Al > 2.0%) can form alumina clusters, leading to nozzle clogging in continuous casting and pinhole defects in gray and ductile iron castings.
Our Solution:
Through strict raw material selection (quartz and low-ash coke) and advanced Submerged Arc Furnace (SAF) control, aluminum is consistently maintained at ≤ 1.0% or ≤ 1.5%, significantly reducing downstream scrap rates and rework losses.

Applications Across Metallurgical Sectors

Primary & Secondary Steelmaking (BOF & EAF)

Acts as a fast-acting deoxidizer in the tapping ladle. It effectively reduces dissolved oxygen in molten steel, producing a calmer heat, minimizing gas inclusions, and improving grain structure in carbon structural steels and HSLA steels.

Calcium Silicon Granules (size customized)

Precision Foundry Industry (Ductile & Gray Iron)

During iron melting, HC FeSi functions as a long-acting graphitizer. It promotes stable graphite nodule formation, improves casting fluidity, and reduces shrinkage and chilling defects in complex automotive and industrial castings.

High-Performance Special Steels

Provides controlled silicon addition required for micro-alloyed steel systems, including:
Electrical Steel (Silicon Steel): Improves magnetic permeability and reduces core loss
Spring & Wear-Resistant Steel: Enhances elasticity and yield strength

Production Workflow

Raw Material Sorting & Blending
Strict chemical screening of quartz, iron sources, and carbon materials to control P, S, and Al input at the earliest stage.

Submerged Arc Furnace (SAF) Smelting
High-temperature reduction above 1800°C, ensuring complete alloy formation and stable phase distribution.

Controlled Ladle Refining & Tapping
Real-time thermochemical adjustments maintain optimal carbon-to-silicon balance prior to solidification.

Casting, Crushing & Mechanical Screening
Controlled cooling prevents internal segregation, followed by multi-stage crushing and precision screening.

Laboratory Verification & Sampling
Each batch undergoes standardized sampling and final verification via optical emission spectrometry (OES) and infrared combustion analysis.

Global Traceability & Third-Party Inspection

To reduce procurement risks, each shipment is supported by full verification documentation:

Certified COA (Certificate of Analysis) per production lot.

Third-party inspection available (SGS, Bureau Veritas (BV), TÜV) covering chemistry, sizing, and loading supervision.

Complete export documentation including MSDS, commercial invoice, packing list, and Certificates of Origin (Form A / Form E / CO) for smooth customs clearance across Europe, North America, and the Middle East.

Certificate

Global Supply Capacity & Export Logistics

Understanding that supply stability is as critical as pricing, our system is designed for continuous industrial-scale delivery.

Continuous production capacity for bulk and contract supply.

Export packaging in 1.0 MT or 1.25 MT waterproof, UV-resistant jumbo PP bags (FIBC).

Customized palletized packaging with ISPM-15 compliance available.

Full Incoterms support: FOB, CFR, CIF via major deep-water ports.

FAQ

Q: How does HC Ferro Silicon compare to standard FeSi 75 in oxidation behavior?

A: Due to its carbon content, HC FeSi forms a localized reducing environment in the ladle, protecting silicon from oxidation and ensuring more stable recovery compared to standard FeSi 75, which is more sensitive to slag conditions.

Q: How do you minimize fines generation during long-distance shipping?

A: We control cooling rates to reduce internal stress, use hardened crushing systems, and pack materials in reinforced jumbo bags with heavy-duty lifting structures to maintain particle integrity during ocean transport.

Q: Can silicon and carbon ratios be customized?

A: Yes. For long-term partners, furnace charging parameters can be adjusted to produce customized grades, including high-silicon low-carbon or mid-carbon variants based on specific metallurgical requirements.

Q: Do you provide inspection documents?

A: Yes, COA is provided for every shipment, and third-party inspection can be arranged if required.

Q: Can specifications be customized?

A: Yes, particle size and chemical ranges can be adjusted depending on furnace requirements and application needs.

Request a Technical Consultation & Quotation

To receive an accurate quotation and technical recommendation within one working day, please provide:

Required chemical specification (Si, C, max Al / P / S)

Particle size requirement (e.g., 10–50 mm or 3–10 mm)

Estimated order volume (trial or annual contract)

Preferred Incoterms and destination port (e.g., CIF Rotterdam, FOB Tianjin)

We're well-known as one of the leading high carbon ferro silicon manufacturers and suppliers in China. If you're going to buy cheap high carbon ferro silicon in stock, welcome to get quotation and free sample from our factory. For price consultation, contact us.