Home >> News

Induction Hardening Provides Excellent Hardness Distribution

Dec. 17, 2021

For heat treatment of steel, alloy and other metal parts, induction hardening offers significant advantages over conventional methods. The process is well suited for metals with carbon content above 0.3%, especially hardened steels with low alloy content. Shafts, gears, armatures, sprockets and other components can be hardened using this induction process.

The process is very demanding on the equipment and inductors used. Ideal hardening results can only be achieved by perfectly matching precisely controlled energy to the best inductor design. CHAOCHANG's experienced engineers custom design induction coils to meet unique customer specifications, and each machine is thoroughly inspected and tested to ensure the best power and heat settings.

Working Principle

The primary application for this induction method is the hardening of steel. One or more induction coils are used to generate and target an alternating magnetic field. This magnetic field creates eddy currents in the metal that heat the workpiece to the desired temperature. Immediately after heating, the component is subjected to a quenching process using water, oil or emulsion. This creates a hardened surface on the metal that is tougher than the base material.

After quenching, the steel is tempered, a low-temperature heat treatment process, to achieve the desired hardness/toughness ratio. The maximum hardness of the steel grade obtained through the hardening process gives the material a lower toughness. Treating steel by tempering reduces the hardness of the material and increases its toughness.

Induction Hardening Provides Excellent Hardness Distribution

Guide rail induction hardening machine

Direct Heating

Induction hardening is a process that generates heat directly in the workpiece. The main advantage of this heat treatment is that the material quickly reaches the required temperature to produce hardened metal parts. When using traditional heat treatments (such as flame, oven or convection), heat is applied to the part by heating the surface layer. These methods take longer and require more energy to produce the desired hardness. In contrast, induction hardening offers very short heating times. This is a very effective and attractive method when manufacturing steel shafts, components and other metal parts in a wide range of industries.

SDF Induction Hardening

Simultaneous dual-frequency hardening, also known as SDF, is particularly suitable for workpieces with complex shapes. The medium and high frequencies overlap so that both act simultaneously on a uniform depth of the material. This ensures that the part is heated at a consistent temperature over the entire part to ensure uniform surface hardness. This application is ideally suited to the process of manufacturing gears and pinions. Smooth and precise hardness layers can be achieved even if the top and bottom of the gear teeth are at different distances from the inductor.

Induction hardening provides the user with excellent control over the hardening process. This safe heating method has multiple applications, including steel shaft and axle fabrication, and can be used in a range of industries. The induction heating machine has minimal space requirements and can be easily integrated into manufacturing processes and production lines. If you need to purchase a hardening machine, please send us a message.

CHAOCHANG offers a wide range of induction hardening generators to provide customers with the highest quality performance. To ensure that the perfect solution is found for any application, our machines are specially designed and manufactured to meet our customers' requirements.

Contact Us

Baoding Chaochang Electromechanical Co., Ltd.