Calcium Silicon Powder (CaSi Powder) is a high-performance composite ferroalloy powder, It is processed by crushing and screening qualified calcium silicon ingots, with silicon and calcium as the main active components, plus a small amount of iron and trace impurities such as aluminum, carbon, phosphorus and sulfur.

Compared with lump calcium silicon alloy, the powder has larger specific surface area, faster reaction speed and more uniform mixing effect. It is widely used as deoxidizer, desulfurizer, inclusion modifier and inoculant in steelmaking and casting industries. It is also the core raw material for calcium silicon cored wire, supporting customized particle sizes and component ratios for different production lines.

Calcium Silicon Powder

Chemical Composition：

Component	Typical Content Range	Function & Importance
Calcium (Ca)	28% – 35%	Drives desulfurization, reduces oxide inclusions, and promotes graphite nucleation in casting.
Silicon (Si)	55% – 65%	Enhances deoxidation efficiency, improves metal strength, and stabilizes alloy structure.
Iron (Fe)	Remainder (3% – 8%)	Acts as a base metal; low Fe content avoids excessive impurities in molten steel/iron.
Impurities (Max.)	Aluminum (Al): ≤ 2.0%	Prevents brittle AlN formation in steel; critical for low-temperature toughness.
	Carbon (C): ≤ 0.5%	Avoids carburization in low-carbon steel and precision castings.
	Phosphorus (P): ≤ 0.04%	Eliminates cold brittleness risk in finished metals (e.g., automotive structural steel).
	Sulfur (S): ≤ 0.02%	Reduces hot cracking in castings and ensures weldability of steel products.

Advantages and Disadvantages of Silicon Calcium Alloy Particles and Silicon Calcium Alloy Cored Wire

Calcium Silicon Cored Wire

Core Applications of Calcium Silicon Powder

Steelmaking & Ladle Refining

Mainly 0.5–2mm powder is used for converter and electric furnace post-treatment. It completes deoxidation, desulfurization and inclusion modification in one process, suitable for pipeline steel, wind power steel and low-alloy structural steel.

Cast Iron Production

2–5mm particles serve as high-efficiency inoculants for gray iron and ductile iron. Widely used in engine parts, brake discs, machine tool beds and other mechanical castings to improve machinability and overall mechanical properties.

Calcium Silicon Cored Wire Manufacturing

0.15–0.5mm (80–200 mesh) powder is the mainstream raw material for cored wire. Uniform size ensures stable filling of steel strips, no blockage during wire drawing and uniform feeding on production lines.

Special Chemical & Alloy Materials

Ultra-fine powder (≥200 mesh) is applied to special alloy synthesis and chemical catalyst preparation, meeting the high requirements of small-batch and high-precision production.

Multi-element Alloy Raw Materials

It can be compounded with aluminum, manganese, barium and other elements to produce Si-Ca-Al, Si-Ca-Mn, Si-Ca-Ba composite alloys for diversified metallurgical demands.

Which calcium silicon powder or calcium silicon cored wire is more suitable for you?

Core Performance & Metallurgical Mechanism

Efficient Deoxidation & Desulfurization

When added to molten steel (dosage: 0.8–1.2 kg per ton steel), CaSi powder can reduce oxygen content from 60–80 ppm to ≤20 ppm. Combined with lime, it converts sulfur into stable CaS, lowering sulfur content to ≤0.012% and effectively solving sulfur embrittlement problems. Its reaction efficiency is 25% higher than lump calcium silicon.

Inclusion Modification

It transforms harmful hard Al₂O₃ inclusions into spherical Ca-Al-Si composite oxides, reducing internal defects of steel and increasing fatigue life by more than 30%.

Graphite Refining for Castings

For cast iron (addition ratio: 0.3%–0.5% of molten iron weight), it optimizes graphite morphology. The proportion of Type A graphite increases by 45%, and the tensile strength of cast iron rises from 220 MPa to over 300 MPa, eliminating white cast defects.

Excellent Physical Properties

Uniform particle distribution, good fluidity, not easy to agglomerate; low moisture content (≤0.5%), stable chemical properties during transportation and use.

calcium silicon powder

FAQ

Q1: What size of CaSi powder is suitable for cored wire production?
A: The industry standard is 0.15–0.5mm (80–200 mesh). This size ensures uniform filling and no blockage during wire processing.
Q2: What is the advantage of calcium silicon powder over lump products?
A: Powder has larger specific surface area, faster reaction speed and higher element utilization rate. It is more suitable for automatic feeding and precision batching processes.
Q3: What are the key points for storage and use?
A: Keep dry and moisture-proof. Do not use damp powder to avoid molten metal splashing caused by chemical reaction with water.
Q4: Can you provide test samples and customized products? What is the delivery time?
A: Free 1–5kg test samples are available. Standard in-stock goods are delivered within 7–15 working days; customized products take 20–30 working days.

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