Product Description
Calcium Silicon, often abbreviated as CaSi, is a ferroalloy composed primarily of calcium (Ca) and silicon (Si), with trace amounts of iron (Fe) and other impurities. Its chemical formula is typically expressed as CaSi₂, but the actual calcium content can range from 28% to 35%.
Alloying Power: Forms stable Fe-Cr solid solutions, boosting steel’s corrosion resistance (e.g., Cr≥12% in stainless steel creates passive film), high-temp strength, and hardness—critical for stainless/tool steels.
- Physical: Grayish-white or silver luster; brittle at room temperature; melts at around 1030-1050°C..
- Chemical: Reacts easily with oxygen, sulfur, and nitrogen in molten steel; has strong deoxidation and desulfurization capabilities.
- Mechanical: Low mechanical strength; easily crushed into small particles for adding into molten steel.
Applications
- Steelmaking Industry (>90% Share)
- Stainless steel: Critical for rust/acid resistance (e.g., 304/316 grades).
- Tool/die steel: Enhances hardness/wear resistance (HRC 55–60).
- Structural steel: Improves low-temp toughness/weldability (bridges/machinery).
- Foundry: Directly makes wear-resistant castings (e.g., crusher liners, HRC≥50, 3–5× longer life than cast iron).
- Others: Produces Cr-based alloys (Ni-Cr heating elements, Cr-Mo high-temp pipes); acts as reducing agent in non-ferrous smelting (e.g., titanium alloys).
Specifications
| Grades | Chemical Composition(%) | ||||||
| Si | Ca≥ | Fe≥ | Al< | C≤ | Ti≤ | P≤ | |
| Ca31Si60 | 50-65 | 31 | 4 | 2.5 | 1 | 0.3 | 0.07 |
| Ca28Si60 | 50-65 | 28 | 4 | 2.5 | 1 | 0.3 | 0.07 |
| Ca24Si60 | 55-65 | 24 | 4 | 2.5 | 1 | 0.3 | 0.04 |
| Ca20Si55 | 50-60 | 20 | 4 | 2.5 | 1 | 0.3 | 0.04 |
| Ca16Si55 | 50-60 | 16 | 4 | 2.5 | 1 | 0.3 | 0.04 |
