Deoxidizer Series

Calcium Silicide Blocks (CaSi Blocks) – Long‑Acting Stable Calcium Treatment and Deep Desulfurization Block Alloy Additive

Calcium Silicide Blocks are dense block‑type metallurgical materials produced by pressing and sintering high‑purity calcium silicide, with calcium content stabilized at 28%–32% and silicon content at 55%–60%. They serve as a key block‑form functional alloy for long‑duration calcium treatment, deep desulfurization, and inclusion modification in LF furnaces, RH vacuum refining, and ladle metallurgy. The product offers core advantages such as gentle and sustained calcium release, high sulfur capacity, and low lining erosion, along with characteristics including high block density, uniform dimensions, and strong thermal shock resistance. It enables gradual dissolution of calcium and deep sulfur binding during high‑temperature refining processes, significantly improving steel cleanliness, reducing sulfur content, and optimizing manganese sulfide inclusion morphology.

Produced through isostatic pressing and sintering under a protective atmosphere, combined with controlled micro‑porosity and optimized crystal structure, the product exhibits low volatile content, high thermal stability, and no tendency to crumble or pulverize. It effectively prevents splashing and fume generation, extends refining furnace lifespan, and enhances the reliability and cost‑efficiency of calcium treatment. It is particularly suitable for specialty metallurgical fields with extremely stringent requirements for sulfur control and inclusion morphology, such as ultra‑low sulfur steels, high‑purity bearing steels, pipeline steels, gear steels, and high‑strength shipbuilding steels.

We provide high‑end specialty steel and clean steel producers with multiple size specifications (10–100 kg/block), customizable calcium‑to‑silicon ratios, and full‑process thermodynamic simulation of calcium treatment for Calcium Silicide Blocks, along with integrated process support services. We are committed to being your strategic technical partner in achieving ultra‑low sulfur control and improving steel fatigue life and service safety.

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