Surface Quenching

What is Surface Quenching?

Surface quenching is a hardening process that metal parts are heated quickly  to the quenching point, and then are cooled quickly, then obtain the target hardness on quenched surface. That means that make the quenched surface into martensitic structure, but the core keep still, then achieve the surface with better hardness and better wear resistance, and the core with enough plasticity and toughness. Surface quenching usually is applied to machine parts made of medium carbon quenched and tempered steel or nodular cast iron.

Normally, surface quenching includes induction heating surface quenching, flame quenching, laser heating and electron beam heating surface hardening.

Induction Heating Surface Quenching

Induction heating surface quenching is a hardening treatment of metal that make the workpiece surface generate current, and rapidly heat it, and then rapidly quench.

Induction heating surface quenching is widely applied because of its many advantages, such as small brittleness, small deformation good surface quality and that quenched surface is not easy to be oxidized.

Flame Quenching

Flame quenching is a quenching method that utilize flame of acetylene-oxygen, gas-oxygen or other flame to heat the surface, then immediately cool it by spraying water, to achieve the target hardness. Temperature of flame heating is very high (more than 3000 ℃), and the workpiece can be quickly heated to quenching temperature point. Besides we could get quenched hard layer with different thickness by adjusting the position and moving speed of burner.