Calcium silicon powder cored wire(casi cored wire) is a key functional material in the ladle refining field of steel metallurgy. It involves densely encapsulating precisely proportioned calcium silicon powder within a low-carbon steel strip, then injecting it into the molten steel at a controlled speed and depth using a wire feeder. This achieves deep purification of the molten steel, control over inclusion morphology, and micro-alloying of properties. This revolutionary process solves the global challenge of incorporating and efficiently utilizing calcium metal due to its low density and boiling point, providing a core technological guarantee for the production of high-purity, high-performance special steels.

Unlike traditional alloy block addition or blowing processes, the core value of calcium silicon cored wire lies in its precision, efficiency, and repeatability. It increases the calcium treatment yield from less than 10% to a stable and controllable 15%-35%, making it a strategic choice for modern steel enterprises to upgrade product quality and overcome quality bottlenecks.

Calcium Silicon Powder Cored Wire

chemical composition

Parameter Categories	AON Metals Specifications and Standards	Metallurgical Significance and Selection Guide
Core Powder Components	Calcium (Ca): 28%-32% (customizable) Silicon (Si): 55%-60% Key Impurity Control: Al ≤2.4%, C ≤1.0%, P ≤0.04%, S ≤0.06%	High calcium content determines treatment intensity, suitable for pipeline steel and bearing steel; silicon assists in deoxidation and stabilizes the reaction. Strict low phosphorus and sulfur content ensures no secondary pollution of molten steel.
Wire Physical Specifications	Outer Diameter: 9mm, 10mm, 13mm (mainstream) Filling Rate: 30%-40% (±1.5% deviation control) Unit Calcium Content: ~120g Ca/m (based on 30% Ca) Packaging: Rust-proof I-beams, 500/1500 meters/coil, with clear markings	Wire diameter must match the wire feeder model and ladle capacity. Uniform filling rate is key to consistent treatment results; our precise control ensures consistent efficiency per meter of wire.
Quality Control and Traceability	Each batch comes with an independent third-party testing report (SGS/BV, etc. optional), recording the production batch number, furnace number, and measured composition values.	This is the core of trustworthiness and authority. Ensuring data transparency supports our clients' quality traceability systems.

Calcium silicon powder cored wire is widely used in the following industries

Steel industry

Ordinary steel production:

When producing ordinary carbon steel and low alloy steel, adding CaSi powder cored wire can effectively deoxidize and desulfurize, reduce harmful impurities in steel, improve the purity of steel, improve the toughness, strength and other mechanical properties of steel, and improve the quality of steel.

Special steel production:

In the production of special steels such as stainless steel and heat-resistant steel, calcium silicon powder cored wire can accurately adjust the composition of molten steel, change the morphology of inclusions, and improve the corrosion resistance, high temperature resistance and other special properties of special steel.

Foundry industry

Cast iron field:

In the production of gray cast iron and ductile iron, CaSi powder cored wire is used as an inoculant to promote graphitization, increase the number of graphite balls, refine the size of graphite balls, and improve the strength, toughness and wear resistance of cast iron. It is widely used in the manufacture of various mechanical parts such as automobile engine cylinders, crankshafts, and machine tool beds.

Steel casting field:

It can purify molten steel, reduce casting defects, improve the quality and performance of steel castings, and is used to produce various large steel castings, such as hubs and gearboxes in wind power equipment.

Nonferrous metal industry

Aluminum and aluminum alloy processing:

In the smelting process of aluminum and aluminum alloys, silicon calcium alloy cored wire can be used as a refining agent to remove hydrogen and inclusions in aluminum liquid, improve the purity and performance of aluminum alloys, improve the casting performance and processing performance of aluminum alloys, and is widely used in the production of aluminum alloy products in the fields of automotive parts, aerospace, etc.

Copper and copper alloy production:

It can deoxidize, desulfurize and purify copper liquid, improve the conductivity, thermal conductivity and mechanical properties of copper and copper alloys, and is used to produce copper products such as wires and cables, electronic components, etc.

Other industries

Powder metallurgy industry:

As an additive added to metal powder, it plays a role in deoxidation and alloying during the sintering process, improves the performance of powder metallurgy products, and improves the density, hardness and strength of products.

Refractory industry:

used to produce some high-performance refractory materials. The silicon and calcium elements in the calcium silicon CW can react with other components in the refractory material to improve the high temperature performance and corrosion resistance of the refractory material.

Calcium Silicon Powder Cored Wire

FAQ

Q: How to steadily improve calcium recovery in wire feeding processes?

A: Recovery rate is a comprehensive reflection of process level. Based on our project experience, we recommend focusing on three points: 1) Timing: Ensure it is carried out after sufficient deoxidation and desulfurization;

2) Depth: The wire feeding depth should reach 1/2 to 2/3 of the hydrostatic head of the molten steel to avoid shallow boiling losses;

3) Stirring: Use appropriate bottom-blowing argon stirring to promote uniform dispersion without excessive exposure. We can provide on-site process audit services to help clients optimize their systems.

Q: How to select the calcium content of the cored wire according to the steel grade?

A: This reflects the professionalism of precise matching. For ultra-low carbon steel and electrical steel, we recommend using high-calcium (>30%) wire to introduce calcium efficiently in small amounts; for high-sulfur content or thick cross-section steel grades, high-calcium wire should also be selected to ensure penetration. For conventional aluminum-killed steel, standard wire with a calcium content of 28%-30% is sufficient, offering better cost-effectiveness. Our technical team can provide you with targeted recommendations.

Q: For producing pipeline steel (e.g., X70, X80) requiring strict HIC resistance, what specific treatment goals should we target with CaSi wire?
A: For HIC-resistant pipeline steels, the primary goal of calcium treatment is inclusion modification, not just desulfurization. You need to ensure that any remaining alumina (Al₂O₃) inclusions are fully transformed into liquid calcium aluminates. This requires sufficient calcium addition to achieve a specific calcium-to-aluminum ratio (often targeted as Ca/Al > 0.1) and ensuring the inclusions are modified before casting. Our high-calcium wire (e.g., Ca >30%) and precise feeding rate recommendations are designed to help you consistently hit this critical target.

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