How Particle Size of Recarburizer Affects Absorption Rate

The particle size of a recarburizer directly determines its carbon absorption rate.

• Too fine (e.g., < 0.2 mm) : High surface area leads to extremely fast dissolution, but fine particles are easily oxidized before contacting molten iron, resulting in low absorption.

• Too coarse (e.g., > 8 mm) : Slow dissolution rate causes the particles to float on the melt surface or remain undissolved, leading to incomplete carbon uptake.

• Optimum size range (typically 1 – 5 mm) : Allows complete dissolution within a reasonable time while minimizing oxidation loss, achieving the highest absorption rate (up to 90% or more).

For consistent and efficient recarburization, selecting a uniform and moderate particle size based on furnace type, metal grade, and charging method is essential.