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Hardening with induction heating

The main benefit of induction heating for hardening is that it takes just a few seconds. In a furnace, the same process can take hours or even days. How is that possible?


The answer is that induction is phenomenal at generating heat fast. This, in turn, means you can integrate hardening in the production process. Hardening in a furnace, on the other hand, is more time-consuming (greater heat loss) and requires moving the components either to your own furnace or to that of a sub-contractor.


In-line integration of hardening reduces your lead times considerably. You get full control over quality, delivery times and costs. There's no need to transport kilos of components back and forward, which saves energy and the environment. And last but not least, you cut down the amount of administration to a minimum.


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Induction hardening 









HardLine - Anlagen zur induktiven Wärmebehandlung


Industrial heat treatment systems


HardLine is our range of stationary heat treatment systems for surface- and through-hardening. At the heart of each HardLine machine is an EFD Induction Sinac heat generator, the industry's most advanced induction frequency converter. These acclaimed converters help ensure optimum hardening results—day in day out, year after year.


The HardLine family includes vertical, horizontal centerless and customized machines—and serial and/or parallel compensated induction power sources with a wide range of output power and frequencies.









To learn more about HardLine please download the brochure or contact your nearest EFD Induction office. 
  HardLine Industrial heat treamtent machines



Mobile heat generators

Minac - Mobile heat generators



Wide range of applications.

Brazing, shrink fitting, hardening, curing, straightening, heat treatment, etc.



Suitable for heating all kinds of electrically conductive materials like copper, aluminum, steel, stainless steel, brass, titanium, etc.


Twin power output.

Many models come in a Twin version featuring two independent power outputs that can operate simultaneously.


Mobile induction.

You can move it around a workshop or factory floor. Can be loaded into a car or van and transported to work sites.


Complete range.

Available with maximum intermittent output power of 10-220 kW (6-140 kW continuous) and a frequency range of 10-280 kHz.




To learn more about Minac please download the brochure or contact your nearest EFD Induction office.
  Minac - Mobile heat generators
Sinac - Universal heat generators


Universal heat generators


Choosing Sinac gives you more than the market's most advanced, most reliable induction heating systems. You also get easy access to EFD Induction’s global service, training and spare parts network. This network—which is made up of manufacturing plants, service centers and local representatives—means you are never far from qualified help and support.  


Opting for Sinac also ensures you get the best possible solution tailored to your specific needs and conditions. Prior to designing your system, our engineers, metallurgists and material experts assess your requirements. Testing and computer simulation at our labs guarantee you receive equipment which is optimized to your applications and which can be painlessly integrated into existing production lines and processes.  





To learn more about Sinac please download the brochure or contact your nearest EFD Induction office. 
  Sinac Universal heat generators


Induction coils

Having the right coil—and keeping it in the best possible condition—is critical to the efficiency of your induction solution. After all, the coil is the component that actually delivers the heat to the workpiece.


Our induction coil services cover all your coil needs: from coil design through to coil manufacture, installation, maintenance, repair and replacement.


Coil design

Correct coil design is essential to cost-effective induction heating. This service ensures you get design customized to your heating applications and materials. Which, in turn, means that you get the right heating patterns and your induction heating power supply delivers maximum output. You can use the service when introduction induction heating for the first time, or when upgrading existing coils. 


Coil database

Each EFD Induction coil is documented in a database containing all essential information. This makes it quick and easy for us to repair and replace your coils with constant quality. You can use the service when introducing induction heating for the first time, or when upgrading existing coils.


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Induction hardening - crankshaft

Induction hardening in the automotive industry

Few industries have benefited as much from induction hardening technology as the automotive sector. And few—if any—induction companies come close to matching our expertise in this key area.


Working closely with many of the world’s top automakers and auto suppliers, we have to date installed more than 2,000 induction hardening solutions in the following areas:

  • Induction hardening of engine parts such as valves, crankshafts, camshafts, connection rods and starter rings
  • Induction hardening of transmission parts, for example CV joints, tulips and axle shafts
  • Induction hardening of suspension parts such as shock absorber rods, springs and suspension arms
  • Induction hardening of parts for automatic and manual gear gearboxes, for example rings, selector shafts and sun gears
  • Induction hardening of clutch springs and brake pads

EFD Induction has spearheaded the development of advanced frequency converters. We also offer frequency converters that run at high and low frequencies simultaneously, known as the Multi Frequency Concept (MFC)—ideal for contour hardening of cogwheels and other complex geometries.

What makes it so effective? More and more companies are opting for induction-based hardening solutions.
Seamless hardening. Why induction is the smarter choice. Seamless induction hardening is the proven cost-saving alternative to thermo-chemical processes.
How to reduce distortion and costs when hardening small gears
EFD Induction crankshaft hardening systems are a proven way to meet stringent specifications, while at the same time minimizing costs.
There are many reasons why induction heating is the preferred method for hardening camshafts.
An integrated induction hardening and tempering solution let you easily produce premium grade chain—a product that commands premium prices in international markets.
HardLine is EFD Induction’s family of heat treatment systems for surface- and through-hardening.
HardLine vertical heat treatment machines
HardLine vertical hardening systems are available in four machine types, each one designed for a range of workpiece sizes: VS, VM, VL, VXL.
HardLine - Centerless Heattreatment Machines
An introduction to the Centerless Pusher (CP) and Centerless Continuous (CC) systems.
Induction hardening. A quick guide to methods and coils

Crankshaft fillet hardening. Challenges and Prospects

Energieeffizienz von Anlagen zum induktiven Randschichthärten

Induction Heating: A Guide to the Process and Its Benefits

Inductive spin hardening of gears

Induction hardening of crankshafts—how to meet even the toughest specifications

Optimizing the performance of vehicle components

Induction heating streamlines production processes

New hardening techniques

New nomographs for induction surface hardening of steel

Hardening techniques

Hardening of slewing rings

Chain hardening

Induction hardening of camshaft lobes

Induction hardening complete steering racks, shafts and gear parts

Induction hardening of crankshaft

What role has induction technology played in the promotion of green wind power?

Induction heating for the aerospace industry

Coating of brake disc

John Deere buys crankshaft hardening system from EFD Induction

In-line heat treatment

Induction hardening of heavy-duty hydraulic motors

The certificate awarded to EFD Induction Germany is the VDA 6.4

Induction hardening of camshafts and crankshafts

Induction hardening of brake shoe

Simultaneous frequencies on a single coil

Induction heat treatment of steel bars

Induction brazing and soldering the inlet caps and outlet pipes of fuel tanks

Die hardening with induction

The world’s fastest and most flexible horizontal hardening machine

Induction scanners for sun gears and shafts

EFD Induction chosen for heat treatment of balance shafts

EFD Induction scores breakthrough order with NSK

Major new technical article by EFD Induction experts

EFD Induction contributes to English-language edition of heat treatment book

EFD Induction expert published by leading steel industry group

EFD Induction to focus on core business—sells commercial heat treatment operation

EFD Induction lands Caterpillar hardening orders

EFD Induction wins series of chain hardening orders in China

Valve specialist Basso orders EFD Induction hardening system

Induction power supports prestigious powerhouse

JTEKT award to EFD Induction China