Calcium Silicon Alloy (CaSi) Manufacturer & Supplier in China
Calcium Silicon Alloy, commonly called CaSi Alloy or Silicon Calcium Alloy, is a functional ferroalloy used mainly in steelmaking and foundry operations. Its combination of calcium and silicon makes it useful for deoxidation, desulfurization, inclusion modification and molten-steel treatment.
For steel mills, the value of calcium silicon is not simply its chemical composition. The actual performance of CaSi depends on calcium availability, particle size, impurity control, addition method, melting conditions and the way the alloy is introduced into molten steel. For this reason, selecting a suitable calcium silicon supplier is important when the material is used for controlled secondary metallurgy.
ZhenAn supplies calcium silicon alloy for steelmaking, casting and metallurgical applications, with standard and customized chemical compositions, particle sizes and packaging options. Customers can request a product specification based on their steel grade, furnace practice and feeding method.
What Is Calcium Silicon Alloy?
Calcium Silicon Alloy is a ferroalloy containing calcium and silicon as its principal active elements, with iron and controlled amounts of other elements forming the balance and impurity profile. Common commercial grades include combinations such as Ca30Si60 and Ca28Si60, while other compositions can be produced according to customer requirements.
Calcium has a strong affinity for oxygen and sulfur. Silicon also has important deoxidizing properties. When CaSi is added to molten steel under suitable metallurgical conditions, the calcium-containing alloy can participate in reactions that help control dissolved oxygen, sulfur and non-metallic inclusions.
This is why calcium silicon is often selected when a steel mill needs more than conventional bulk deoxidation. It can become part of a broader inclusion engineering strategy during ladle treatment.
Typical Calcium Silicon Alloy Specifications
| Grade | Ca (%) | Si (%) | C Max (%) | Al Max (%) | P Max (%) | S Max (%) |
|---|---|---|---|---|---|---|
| Ca30Si60 | ≥30 | 55–60 / 60 typical | 1.0 | 2.4 | 0.04 | 0.04–0.05 |
| Ca28Si60 | ≥28 | 55–65 | 1.0 | 2.4 | 0.04 | 0.04–0.05 |
| Customized CaSi | On request | On request | On request | On request | On request | On request |
Specifications can vary according to the production standard and application. Before placing a bulk order, buyers should confirm the required CaSi chemical composition, particle size, moisture requirement, packaging and inspection standard.
Why Is CaSi Used in Steelmaking?
1. Deoxidation
One of the primary applications of calcium silicon alloy is deoxidation during secondary steelmaking. Dissolved oxygen remaining in molten steel can contribute to oxide inclusion formation. Calcium silicon provides a combined calcium-silicon addition that can support oxygen control during ladle treatment.
2. Desulfurization
Calcium has a strong affinity for sulfur. Under appropriate steelmaking conditions, calcium-containing additions can help reduce the harmful effects associated with sulfur and contribute to cleaner molten steel.
3. Inclusion Modification
This is one of the most important reasons steelmakers use CaSi. Instead of treating inclusions only as unwanted particles, modern secondary metallurgy often aims to control their composition, shape and behavior. Calcium treatment can modify certain oxide and sulfide inclusions so that they become less harmful to steel processing and final performance.
4. Improved Castability
Proper calcium treatment may contribute to improved nozzle flow and casting stability by changing the characteristics of certain inclusions. The actual result depends strongly on steel chemistry, calcium recovery, temperature and treatment practice.
Available Particle Sizes
Calcium silicon alloy can be supplied in different particle sizes depending on how it is added to the furnace or ladle.
- 0–3 mm
- 1–3 mm
- 3–10 mm
- 10–50 mm
- 10–100 mm
- Customized particle size
For direct ladle addition, the required size may differ from the size used for alloy preparation or cored wire production. Uniform particle sizing can help improve feeding consistency and reduce excessive fines.
Calcium Silicon Alloy for Different Steel Grades
CaSi can be used in carbon steel, alloy steel, stainless steel, bearing steel, spring steel, tool steel, rail steel and other grades where controlled calcium treatment is required.
However, the correct CaSi grade should not be selected only by looking at the highest calcium percentage. A purchasing engineer should consider the complete steelmaking recipe, including aluminum content, sulfur level, oxygen activity, ladle temperature, treatment time and target inclusion characteristics.
CaSi Alloy vs Conventional Deoxidizers
Ferrosilicon and aluminum are widely used for bulk deoxidation, while calcium silicon has a different role when calcium treatment and inclusion modification are required.
Ferrosilicon is primarily valued for silicon addition and deoxidation. Aluminum is a powerful deoxidizer but may produce alumina inclusions that require subsequent control. Calcium silicon can be introduced later in the refining process to support calcium treatment and inclusion modification.
Therefore, CaSi is often better understood as a specialized secondary-metallurgy material rather than simply another deoxidizer.
Packaging and Storage
Calcium silicon should be protected from moisture and contamination during storage and transportation. Typical export packaging can include 25 kg bags, 1 MT jumbo bags, palletized packaging or customer-specified packaging.
For long-distance transportation, buyers should specify whether moisture-resistant inner packaging, pallets, labeling or other export requirements are necessary.
Quality Control for Calcium Silicon
For CaSi, chemical composition is only one part of product quality. A practical purchasing inspection may include:
- Calcium and silicon content
- Carbon content
- Aluminum content
- Phosphorus and sulfur levels
- Particle-size distribution
- Moisture condition
- Packaging integrity
- Batch consistency
For large steel mill orders, buyers can also request a Certificate of Analysis (COA) and third-party inspection according to their purchasing procedure.
Why Buy Calcium Silicon from ZhenAn?
ZhenAn provides calcium silicon and other ferroalloys for international industrial customers. Our supply approach focuses on matching the product to the customer's actual metallurgical process rather than selling one fixed specification to every buyer.
- Standard and customized CaSi grades
- Different particle sizes available
- Bulk industrial orders supported
- Export packaging options
- Technical specification confirmation before shipment
- COA and inspection support
- Global export service
Frequently Asked Questions
1. What is calcium silicon alloy used for?
Calcium silicon alloy is mainly used for deoxidation, desulfurization and inclusion modification in steelmaking. It can also be used in foundry applications as an inoculating or modifying material.
2. What is the difference between CaSi 30/60 and CaSi 28/60?
The main difference is the specified calcium content. CaSi 30/60 generally contains around 30% calcium, while CaSi 28/60 generally contains around 28% calcium. The appropriate grade depends on the customer's treatment process.
3. What particle sizes are available?
Common sizes include 0–3 mm, 1–3 mm, 3–10 mm and 10–50 mm. Customized sizes can also be discussed.
4. Can you provide customized CaSi composition?
Yes. Calcium silicon can be customized according to calcium, silicon and impurity requirements, subject to production feasibility.
5. How should calcium silicon be stored?
Store CaSi in a dry, covered area and protect it from rain, moisture and contamination. Keep packaging sealed until use whenever possible.
6. Can CaSi be supplied for cored wire production?
Yes. Suitable calcium silicon powder can be prepared for CaSi cored wire, with particle size and chemical composition matched to the wire production process.
7. Can I request a quotation before placing an order?
Yes. Send us your required grade, quantity, size, destination and packaging requirements. Our sales team can provide a quotation and technical specification for confirmation.
Request a Calcium Silicon Alloy Quote
If you are looking for a reliable calcium silicon alloy supplier for steelmaking, foundry or alloy distribution, send us your technical requirements. We can help confirm the suitable CaSi grade, size, packaging and export arrangement.
Contact ZhenAn for Calcium Silicon Alloy →
Tell us your CaSi grade, calcium content, silicon content, particle size, quantity and destination to receive a product quotation.
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