Ferro Calcium Cored Wire is a linear composite material made by tightly encasing refined calcium ferro alloy powder within a continuous steel strip. It is precisely injected into the molten steel in the ladle at a controlled speed and depth using a specialized wire feeder. This design solves the problems of volatile, low-density, and difficult-to-add calcium metal, making it a key material for achieving efficient "calcium treatment" in ladle refining and crucial for producing high-purity, high-performance steel.

Main target steel grades and application effects

Target Steel Grades	Main Functions	Expected Results
Pipeline Steel (X70 and above)	Sulfide morphology control, improving resistance to hydrogen-induced cracking (HIC)	Inclusion spheroidization ensures safety and toughness in harsh environments.
Bearing Steel, Gear Steel	Purifying molten steel, modifying oxide inclusions, and improving cleanliness	Significantly improves contact fatigue life and reduces early failure.
Welding Wire Steel, Cold Heading Steel	Improving inclusion morphology, preventing tensile fracture	Improves wire drawing performance and yield.
Aluminum Deoxidized Killed Steel	Preventing nozzle blockage, improving castability	Ensures smooth continuous casting and increases production efficiency.

Product Specifications and Usage Guide

Project	Instructions and Recommendations
Wire Diameter	Common Specifications: 9mm, 10mm, 13mm. Selection should be based on the wire feeder model and ladle capacity to ensure the feeding depth reaches the optimal reaction zone of the molten steel.
Core Composition	Calcium Content (Ca): Typically 28%-32%, with the remainder mainly consisting of iron (Fe) and small amounts of aluminum (Al) and silicon (Si). High calcium content ensures better treatment results and reduces the amount of wire required.
Filling Ratio	This refers to the percentage of powder weight to the total weight of the wire, typically 30%-40%. Stable filling rate is crucial for ensuring uniform calcium content per meter of wire.
Covering Layer	Usually low-carbon steel strip with uniform thickness and strong welds to ensure no cracking or powder leakage during feeding.
Spool Packaging	Standard spools (e.g., 500-1500 meters/spool), securely packaged to prevent wire tangling.

Products Usage and packaging

1: Purifying Molten Steel and Deep Deoxidation and Desulfurization

Deep Deoxidation:

Calcium (Ca) has a strong affinity for oxygen (O), further reducing dissolved oxygen in steel on the basis of aluminum deoxidation, generating low-melting-point calcium aluminate complex inclusions.

High-Efficiency Desulfurization:

Calcium reacts with sulfur (S) in steel to form spherical or dot-like calcium sulfide (CaS), significantly reducing sulfur content and the harmful effects of manganese sulfide (MnS), preventing "sulfide streaks" during steel rolling, and improving isotropy.

2: Non-Metallic Inclusion Morphology Control (Core Value)

This is the core purpose of calcium treatment. Untreated Al₂O₃ (alumina) inclusions are chain-like or clustered, with high hardness and melting point, severely impairing the fatigue life, toughness, and processing performance of steel (e.g., causing tensile fracture).

"Modification" effect:

Calcium can modify high-melting-point solid Al₂O₃ inclusions into low-melting-point (~1600℃) liquid calcium aluminates (such as 12CaO·7Al₂O₃).

Benefits:

Liquid inclusions are more likely to collide, aggregate, and float to the slag layer for removal during molten steel casting. Even the small amount of remaining inclusions are distributed in small spherical shapes, significantly reducing their harmfulness to steel properties. This is called "inclusion spheroidization treatment."

3: Improving steel castability and preventing nozzle blockage

In continuous casting, untreated Al₂O₃ inclusions easily deposit on the inner wall of the nozzle, leading to nozzle narrowing or even blockage, causing production interruptions.

Calcium treatment keeps inclusions in a liquid state, making them less likely to adhere to the nozzle wall, thus ensuring smooth continuous casting, increasing the number of consecutive casting heats, and reducing the production accident rate.

4: Microalloying and Performance Enhancement

Calcium is a powerful grain refiner, helping to improve the low-temperature toughness and weldability of steel.

In high-quality specialty steels, such as bearing steel, gear steel, spring steel, and heavy-duty wheel steel, calcium treatment is a standard process to ensure high fatigue strength and long service life.

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