Calcium Silicon (CaSi) Cored Wire technology represents a paradigm shift in secondary metallurgy, offering an unprecedentedly precise and efficient method for the treatment of molten steel. This sophisticated composite material, consisting of meticulously calibrated calcium-silicon alloy powder securely enclosed within a thin, cold-rolled steel sheath, has fundamentally transformed how steelmakers conduct ladle furnace operations. The technology facilitates the direct, controlled injection of highly reactive calcium into the heart of the molten steel bath, ensuring maximum reaction efficiency with dissolved oxygen and sulfur, while dramatically minimizing elemental loss through oxidation and vaporization.
Modern CaSi cored wire is engineered to exacting specifications to ensure consistent and reliable performance:
| Parameter | Typical Specification | Importance in Steel Refining |
| Core Composition | Calcium: 28 – 33%; Silicon: 55 – 65% | Provides the necessary chemical agents for deoxidation, desulfurization, and most critically, inclusion modification. |
| Steel Sheath Thickness | 0.25 – 0.40 mm | Offers optimal protection for the reactive core against moisture and air, while maintaining flexibility for smooth feeding through automated systems. |
| Standard Diameters | 9 mm, 13 mm, 16 mm | Caters to different treatment intensities and ladle sizes; custom diameters are available for specialized applications. |
| Powder Density | 3.8 – 4.2 g/cm³ (consistent throughout coil) | Guarantees uniform and predictable release of calcium during the wire feeding process, leading to consistent treatment results. |
The metallurgical benefits of implementing advanced CaSi wire treatment are substantial and quantifiable. Inclusion modification efficiency improves by 40-60% compared to traditional powder injection methods, transforming solid, abrasive alumina (Al₂O₃) inclusions into softer, globular calcium aluminates that do not impair machinability or product quality. Furthermore, calcium yield—the proportion of added calcium that remains in the steel to perform its function—typically reaches 18-25%, significantly higher than the 8-15% achieved with conventional addition methods. This dramatic enhancement in efficiency directly translates to reduced consumption rates; modern steel plants report CaSi wire usage of 0.8-1.2 kg per ton of steel, compared to 1.5-2.0 kg/ton required by earlier, less efficient technologies.
At Anyang Zhenxin, our fully automated production lines incorporate real-time monitoring systems that track thirteen separate quality parameters during the manufacturing process, ensuring every meter of wire meets the highest standards. Each finished coil undergoes individual mechanical and functional testing, including assessments of tensile strength (minimum 250 MPa), elongation characteristics, and powder retention capacity to prevent leakage. Our proprietary advanced coating technology provides an additional layer of corrosion resistance, effectively extending the product’s shelf life to 18 months without any degradation in performance, even in challenging storage environments.