The relationship between carbon content and hardness in high-chromium balls

Release time：2025-09-12

The relationship between carbon content and hardness in high-chromium balls

The national standard for casting steel balls, GB/T17445-2002, stipulates that the carbon content in high-chromium cast balls should generally be controlled within 2.1% - 3.6%. In theory, assuming that the steel ball forming process and other chemical components remain unchanged or are determined, as the carbon content increases in the steel ball, the initial hardness of the cast state of the steel ball also increases. So, if the initial hardness of the steel ball in the cast state is high, will its hardness be high after heat treatment? The answer is definitely not. In the heat treatment of steel balls, the heating, holding, cooling and tempering equipment and processes, including the quenching medium and cooling rate, have a significant impact on the mechanical properties such as the quenching and tempering hardness of high-chromium cast balls.