Heat treatment heating surface quenching

Heat treatment, heating and surface quenching are divided into two types:

Surface quenching by flame heating

Operation method: use the flame burning with oxygen acetylene mixed gas, spray it on the surface of steel parts, heat it quickly, and spray water to cool it when it reaches the quenching temperature.

Intention: improve the surface hardness, wear resistance and fatigue strength of steel parts, and the core still adheres to the condition of resistance.

The key points of application: (1) it is mainly used for medium carbon steel parts, usually the depth of the harden layer is 2-6mm; (2) it is suitable for single or small batch production of large workpieces and workpieces requiring partial quenching.

Induction hardening

Operation method: put the steel into the inductor, make the induced current on the surface of the steel, heat it to the quenching temperature in a very short time, and then spray water for cooling.

Intention: to improve the surface hardness, wear resistance and fatigue strength of steel parts, and to adhere to the condition of resistance in the core.

The key points of application: (1) it is mainly used for medium carbon steel and hall alloy layout steel; (2) due to skin effect, the harden layer of high frequency induction hardening is usually 1-2mm, medium frequency quenching is usually 3-5mm, and high frequency quenching is usually more than 10 mm.