Ca-Fe Cored Wires
Introduction
Calcium Ferro Cored Wire is a cost-effective additive for steelmaking, manufactured by encasing Calcium Ferroalloy powder (typically CaFe) in a thin steel strip. Via wire-feeding technology, it delivers calcium precisely into molten steel, primarily for deoxidation, desulfurization, and inclusion morphology control, playing a key role in optimizing steel quality.
|
Type/Manufacturer's Marking |
Core Chemical Composition |
Impurity Content |
Other Relevant Indicators |
|
Conventional General-Purpose Type |
Ca ≥ 30%, Fe ≤ 70% |
Al ≤ 0.8% |
Common wire diameters: 13/16mm; cold-rolled steel strip is used as the outer sheath to wrap the core material |
|
Medium-Calcium Type |
Ca: 25%-30%, Balance: Fe |
Total impurities such as Si and C are usually controlled to be ≤ 1.0% |
The core powder is evenly mixed, suitable for the smelting of plain carbon steel that requires a moderate amount of calcium addition |
|
High-Calcium Type (Customized) |
Ca: 15% (combined with Si: 55%, Ba: 15%) |
No clearly publicized impurity standards; mostly requiring S, P ≤ 0.06% |
Wire diameter: 13mm; steel strip thickness: 0.4mm; core powder mass: 215g/m; uniformity: 2.5%-5% |
Production Process
The production process begins by crushing and milling the CaFe alloy into fine powder of specified size. This powder is then continuously and uniformly fed into a steel strip via precision machinery. The strip is rolled through multiple stages to form a tightly sealed wire, which is finally wound into coils, ensuring a dense and continuous product.
Applications
Steel Calcium Treatment: Primarily used in secondary refining stations like the LF furnace for deoxidation, desulfurization, and modifying harmful inclusions.
Improving Castability: Effectively prevents nozzle clogging, ensuring smooth continuous casting and increasing sequence length.
Enhancing Steel Properties: Transforms high-melting-point Al₂O₃ inclusions into low-melting-point compounds that are easy to remove, significantly improving the impact toughness and fatigue strength of steel.
Features
Cost-Effective: Offers a superior cost advantage compared to pure calcium wire while ensuring effective calcium treatment.
Proven Effectiveness: Effectively improves molten steel fluidity, purifies the melt, and enhances steel impact toughness.
High Calcium Yield: The deep-feeding method minimizes calcium oxidation loss, increasing utilization.
Stable Composition: The cored wire structure allows precise dosage control, ensuring consistent metallurgical results.
FAQ
Q: What is the main difference between CaFe Cored Wire and CaSi Cored Wire?
A: The key difference lies in the core composition. CaFe wire uses a CaFe alloy with a lower calcium content, offering cost efficiency and a milder reaction. CaSi wire provides higher calcium yield and stronger deoxidation but at a higher cost. The choice depends on steel grade requirements and budget.
Q: What is the typical calcium yield?
A: The yield is influenced by factors like molten steel temperature, slag condition, and operating practice, typically ranging from 10% to 25%, which is a significant improvement over traditional addition methods.
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