Induction hardening
INDUCTION HARDENING
High-frequency induction hardening is one of the most effective methods of surface hardening of metals. Thanks to intensive induction heating, the surface hardness of a part is 2–4 HRC higher than with conventional through hardening. At the same time, a tough core is retained, which is critical for reducing brittleness under impact loads.
Process parameters and equipment
The process is carried out on advanced induction equipment. A modern induction hardening system consists of a high-frequency generator, a transformer and an inductor (coil).
Process specifications:
- Hardened case depth: 1 to 5 mm.
- Equipment: modern induction hardening system.
- Tooling: copper-tube inductors designed individually for the part geometry (from simple coils to complex multi-turn systems).
This configuration ensures precise, localized energy input and allows the heating intensity to be adapted to any design features of the part.
OUR INDUCTION HARDENING CAPABILITIES
- Shafts, axles, piston rods: up to 3000 mm long.
- Rings, gears, gear wheels: up to 1200 mm in diameter.
- Maximum part weight: up to 500 kg.
This wide size range allows us to process both small precision parts and heavy industrial components.
Workpiece dimensions:
— rings, gear wheels, etc.: up to 1200 mm in diameter;
— shafts, etc.: up to 3000 mm long;
Workpiece weight: up to 500 kg
HOW INDUCTION HARDENING WORKS
The technology is based on heating the surface by eddy currents generated in a powerful electromagnetic field between the inductor and the workpiece.
Features of induction hardening
- high processing speed and no distortion (warping);
- precise control of heating parameters;
- clean surface (minimal scale formation);
- excellent antifriction properties of the metal.
Despite the high capital cost of the technology, the excellent repeatability of results and the long service life of hardened parts make induction hardening the most cost-effective option for high-precision serial production.
The main drawback is the high cost of the equipment.
Industrial induction hardening equipment: precision and automation
A modern high-frequency induction system is an advanced unit for localized heat treatment of metal, in which heating parameters are controlled with high accuracy. Current frequency, power, heating rate and holding time are selected according to the part geometry, steel grade and required case depth.
Unlike furnace heating, induction heating concentrates energy only in the required zone. This makes it possible to selectively harden specific areas of a part — gear teeth, shaft journals, bearing raceways, mating surfaces and other loaded features — without significantly affecting the rest of the component.
This approach ensures high repeatability, minimal distortion and consistent properties in serial production. To maintain consistent quality, our induction equipment is regularly serviced and its operating parameters are monitored.
Process flexibility: from hardening to induction welding
In addition to surface hardening, induction heating is widely used in manufacturing operations that require fast, localized heating without prolonged heating of the entire part. High energy density, precise temperature control and minimal heat input into adjacent areas make induction technologies effective both in serial production and in repair and assembly work.
Induction technologies are effective for:
- brazing carbide inserts onto cutting tools;
- localized heating of parts before assembly or disassembly;
- shrink fitting of precision parts into machine assemblies;
- tempering and normalizing of metal after machining;
- localized heating for high-frequency induction welding.
The versatility of induction methods allows us to solve a wide range of tasks — from precision assembly of units to final correction of alloy microstructure.
An expert approach to induction hardening at KARBAZ LLC
Surface hardening with high-frequency currents is a precision process of localized heat treatment that combines a hard, wear-resistant case with a tough core. This gives parts high resistance to impact and cyclic loads.
Key advantages of the technology:
- Structural consistency: precisely selected heating and quenching parameters deliver consistent properties of the hardened case and minimize the risk of overheating or distortion.
- Longer service life: induction hardening increases wear resistance and fatigue strength, which is especially important for shafts, gears, drivetrain components and other heavily loaded assemblies.
- Dimensional accuracy: fast, localized heating preserves the original dimensions and shape of parts, minimizing the need for additional machining.
KARBAZ combines the hands-on experience of its engineering team with the capabilities of modern induction equipment. This allows us to harden single parts and critical assemblies as well as production batches with consistent results.
Why choose induction hardening at KARBAZ
Induction hardening in our workshops improves critical properties such as fatigue strength and wear resistance. This makes finished parts well suited for engines, precision machine tools and special-purpose machinery, where material reliability requirements are the highest. Precise control of heating modes and quenching media produces a stable metal microstructure free of internal defects.
Benefits of induction hardening at KARBAZ
High-frequency induction hardening increases the wear resistance and fatigue strength of parts operating under high loads and cyclic wear.
The technology is widely used for engine and transmission parts, industrial equipment, special-purpose machinery and other critical assemblies where a hard working surface must be combined with a strong core.
Control of heating and quenching parameters ensures consistent properties of the hardened case and repeatable results in serial production.