When a low carbon steel is undergoing heat treatment for the purposes of casehardening, what is the process that distinguishes this procedure from other hardening methods?

Correct Answer: Option A — After the steel is heated above its critical temperature, it is quenched in a carbon bath.

Casehardening, or carburizing, introduces carbon into the surface of low-carbon steel. By heating the steel above its critical temperature in a carbon-rich environment, carbon atoms diffuse into the surface layer. Subsequent quenching creates a hard, wear-resistant outer shell while maintaining a tough, ductile core for structural integrity.