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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


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.


Click to read the brochure


Induction hardening 









Induction tempering

Tempering with induction heating

Tempering solutions from EFD Induction are present in the automotive and automotive-supply industries. In fact, tempering can be performed on all hardened components—bars, joints, shafts, etc.


Tempering a component only takes around ten seconds, unlike in a furnace where it can take a couple of hours. The reason is that induction generates heat directly in the material— exactly where you need it.


This means tempering can be directly integrated into your production line to improve throughput, increase flexibility and save floor space.


Induction heating for the automotive industry

EFD Induction has for years been a trusted supplier of induction heating solutions to numerous automakers in North America and Europe. We also work with many tier-one suppliers and sub-contractors.  


Induction heating is used within a variety of fields in the automotive industry such as:

  • Induction bonding of body parts and magnets in electric motors
  • Induction brazing of connections for air-conditioning systems, brake linings and fuel tank injection pipes
  • Induction hardening and tempering of engine, suspension and transmission parts
  • Induction preheating of transmission parts, for example shrink fitting of gear wheels
  • Induction postheating of engine parts and brake discs (polymerization)
  • Induction straightening of steel chassis







HardLine is EFD Induction’s family of heat treatment systems for surface- and through-hardening.
HardLine - Centerless Heattreatment Machines
An introduction to the Centerless Pusher (CP) and Centerless Continuous (CC) systems.
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.
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.
Induction hardening. A quick guide to methods and coils

Crankshaft fillet hardening. Challenges and Prospects

Energieeffizienz von Anlagen zum induktiven Randschichth?rten

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

Induction hardening of camshaft lobes

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

John Deere buys crankshaft hardening system from EFD Induction

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

Induction heating for the aerospace industry

In-line heat treatment

Induction hardening of heavy-duty hydraulic motors

Induction hardening of camshafts and crankshafts

Simultaneous frequencies on a single coil

The certificate awarded to EFD Induction Germany is the VDA 6.4

Induction heat treatment of steel bars

Induction hardening of brake shoe

Induction hardening complete steering racks, shafts and gear parts

Induction hardening of crankshaft

The world’s fastest and most flexible horizontal hardening machine

EFD Induction lands major order for thread annealing of CV joints

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 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

Valve specialist Basso orders EFD Induction hardening system

JTEKT award to EFD Induction China