What Heat Treatment is Required for Agricultural Plough Discs

Core Requirements for Heat Treatment of Agricultural Plough Discs

Enhancing Wear Resistance:

As plough discs directly contact soil during farming, they must withstand friction and impact. Quenching significantly improves surface hardness.

Improving Toughness:

To prevent brittle fracture caused by excessive hardness, tempering and other processes are used to balance hardness and toughness.

Optimizing Microstructure:

Quenching forms hard structures like martensite, while tempering produces tempered martensite or bainite, enhancing overall performance.

I. Heat Treatment Process Flow

Quenching:

Heat to 800–850°C in a protective atmosphere (e.g., nitrogen) using a quenching furnace to achieve austenitization.

Tempering:

Immediately temper at 300–400°C after quenching to relieve residual stresses and adjust the hardness-toughness balance.

Target Hardness: 38–45 HRC, ensuring edge wear resistance while avoiding brittle fracture.

II. Basis for Material and Process Selection

Material Characteristics

65Mn Steel: High elasticity and excellent wear resistance, ideal for plough discs subjected to impact loads.

Process Advantages

Heating in Protective Atmosphere (e.g., Nitrogen): Prevents oxidation and decarburization, ensuring surface quality.