Silicon Calcium (SiCa) Alloy - Product Introduction
Silicon calcium alloy, commonly abbreviated as SiCa, is a binary ferroalloy composed primarily of silicon and calcium. It is widely employed as a deoxidizer and desulfurizer in steelmaking, particularly in the production of high-quality carbon steel, alloy steel, and stainless steel. The simultaneous presence of silicon and calcium provides a synergistic refining effect: silicon removes oxygen while calcium modifies sulfide inclusions, improving machinability and mechanical anisotropy. SiCa is also used as an inoculant in cast iron to promote graphite nodularity.
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Core Selling Points
- Dual-action deoxidation and desulfurization in a single addition.
- Calcium modification of MnS inclusions improves surface quality and reduces tool wear during machining.
- Wide application spectrum covering BOF, EAF, and ladle metallurgy routes.
- Available as cored wire, lump, or powder to match different injection systems.
- Produced in ISO-aligned facilities with batch-level chemical certification.
Technical Specifications & Grades
The following table shows typical chemical composition ranges for common grades. Exact inventory and latest batch certificates are available on request.
| Grade | Si (%) | Ca (%) | C (% max) | Al (% max) | P (% max) | S (% max) |
| SiCa 30/55 | 55–65 | 28–32 | 1.0 | 1.5 | 0.04 | 0.05 |
| SiCa 28/55 | 55–65 | 26–30 | 1.0 | 1.5 | 0.04 | 0.05 |
| SiCa 25/50 | 50–60 | 23–28 | 1.0 | 1.5 | 0.04 | 0.05 |
| SiCa 20/50 | 50–60 | 18–22 | 1.0 | 1.5 | 0.04 | 0.05 |
| SiCa 15/50 | 50–60 | 13–17 | 1.0 | 1.5 | 0.04 | 0.05 |
The table above reflects industry-typical ranges for common SiCa grades. Exact composition, sizing, and packaging should be confirmed against current mill certificates and inventory status before ordering.
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Applications & Industries
Steel Deoxidation & Desulfurization: In both basic oxygen and electric-arc furnace operations, SiCa is added to the ladle or tundish to reduce dissolved oxygen and sulfur levels. The calcium component converts elongated sulfide inclusions into globular shapes, enhancing ductility and toughness in the final steel product.
Cast Iron Inoculation: SiCa promotes the formation of spheroidal graphite in ductile iron production. This improves tensile strength, elongation, and fatigue resistance compared to gray iron with flake graphite.
Cored Wire Injection: SiCa cored wire allows precise depth injection into molten metal, minimizing fume generation and improving recovery rates compared to bulk additions. This method is favored in modern ladle metallurgy stations.
Alloy Steel & Stainless Production: In specialty steel grades, controlled calcium treatment via SiCa improves castability and reduces nozzle clogging during continuous casting.
Product Delivery, Packaging & Logistics
Forms: Standard lump (10–50mm, 10–80mm), cored wire (9–13mm outer diameter, powder-filled), and fine powder (0–3mm) for pneumatic injection.
Packaging: 1-ton jumbo bags for lump material; steel or plastic reels for cored wire; 25 kg sealed PE bags for powder. Moisture protection is critical because calcium is highly reactive with water vapor.
Shipping: FOB Chinese main ports, CIF worldwide, or DAP to designated inland warehouses. Transit insurance and export licenses are handled in-house. Lead time is typically 10–15 days after deposit confirmation.
Frequently Asked Questions
- Q: What is the difference between SiCa and ferrosilicon as a deoxidizer?
- A: Ferrosilicon provides deoxidation primarily through silicon, while SiCa offers both deoxidation (via Si) and desulfurization/inclusion modification (via Ca). For steels requiring high surface finish or deep drawing, SiCa is the preferred choice.
- Q: How should silicon calcium be stored?
- A: SiCa must be kept in a dry, ventilated warehouse away from moisture and rain. Calcium reacts with water to produce hydrogen gas, so sealed packaging and covered storage are essential for safety.
- Q: Can you supply SiCa cored wire with custom core diameters?
- A: Yes. We can manufacture cored wire with 9 mm, 13 mm, or 16 mm outer diameters and adjust the powder-to-steel ratio to match your injection parameters. Technical datasheets are available on request.
- Q: What is the typical recovery rate of calcium when using SiCa cored wire?
- A: Calcium recovery depends on bath temperature, wire feed speed, and injection depth. Under typical ladle conditions, recovery ranges from 10–25%. Our technical team can advise on optimizing your parameters.
Contact ZhenAn International Today
WhatsApp: +86 15518824805
Email: market@zanewmetal.com
ZhenAn International Co., Limited - 30 Years of Ferroalloy Experience | Website: www.metal-alloy.com
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