Product Overview
Calcium Silicon (SiCa) is a highly effective composite alloy widely used in the steelmaking industry as a deoxidizer, desulfurizer, and inclusion modifier. It plays a critical role in improving the cleanliness, mechanical properties, and overall quality of molten steel. Our Calcium Silicon alloy is manufactured under strict quality control to ensure consistent composition, precise sizing, and reliable performance for modern steel production.
Key Features
Strong Deoxidation Ability – Effectively removes oxygen from molten steel, reducing oxide inclusions.
Inclusion Modification – Transforms alumina inclusions into low-melting-point calcium aluminates, improving steel cleanliness and castability.
Desulfurization – Enhances sulfur removal efficiency, contributing to better steel purity.
Consistent Composition – Produced with tightly controlled chemical specifications to ensure stable performance.
Custom Sizing Available – Available in various size ranges (e.g., 10–50 mm, 0–2 mm) to suit ladle addition or cored wire applications.
Typical Chemical Composition
| Element | Specification (%) |
|---|---|
| Calcium (Ca) | 28–32 |
| Silicon (Si) | 55–65 |
| Carbon (C) | ≤ 1.0 |
| Aluminum (Al) | ≤ 1.5 |
| Phosphorus (P) | ≤ 0.05 |
| Sulfur (S) | ≤ 0.05 |
Note: Specifications can be adjusted based on customer requirements.
Applications
Ladle Metallurgy – Added during secondary steelmaking for deoxidation and inclusion modification.
Cored Wire Injection – Used in calcium treatment to improve steel castability and reduce nozzle clogging.
Special Steel Production – Essential for producing high-quality grades such as bearing steel, tire cord steel, and pipeline steel.
Case Study: Improving Castability in a Large Steel Mill
Background
A leading steel manufacturer in Southeast Asia was experiencing frequent nozzle clogging during continuous casting of aluminum-killed low-carbon steel. The clogging resulted in production interruptions, increased maintenance costs, and reduced yield. The customer sought a reliable solution to improve steel cleanliness and castability.
Challenge
The primary issue was the formation of high-melting-point alumina (Al₂O₃) inclusions, which accumulated in the tundish nozzle during casting. The existing deoxidation practice using aluminum alone was insufficient to modify these inclusions into a less harmful form.
Solution
Our technical team recommended switching to a calcium treatment process using our Calcium Silicon alloy in cored wire form. The calcium reacted with alumina inclusions to form liquid calcium aluminates (e.g., 12CaO·7Al₂O₃), which have a much lower melting point and are less likely to adhere to the nozzle.
Implementation
Calcium Silicon cored wire was injected in the ladle furnace after aluminum deoxidation.
A controlled calcium addition was applied based on the steel grade and aluminum content.
Process parameters were optimized in collaboration with the mill's metallurgical team.
Results
| Parameter | Before Treatment | After Treatment |
|---|---|---|
| Nozzle clogging frequency | 3–4 times per sequence | 0–1 time per sequence |
| Casting sequence length | 4–5 heats | 8–10 heats |
| Total oxygen (T.O) in steel | 18–25 ppm | 10–15 ppm |
| Inclusion rating (ASTM) | >2.0 | ≤1.0 |
Customer Feedback
"Since implementing the calcium treatment with your Calcium Silicon cored wire, our casting operations have become significantly more stable. Nozzle clogging has been virtually eliminated, and we have achieved a noticeable improvement in final product quality."
Why Choose Our Calcium Silicon?
Quality Assurance – Every batch is tested to ensure strict compliance with chemical and physical specifications.
Technical Support – Our metallurgical experts provide on-site or remote support to optimize your application process.
Reliable Supply Chain – Consistent production capacity ensures timely delivery for both trial and long-term contracts.
Global Experience – Trusted by steel mills across Asia, Europe, and the Americas.
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