Induction Hardening

Induction Hardening

What is induction hardening?

Hardening is any metallurgical process by which a material is given a higher resistance to plastic deformation. This is accomplished by many methods, including heating. Induction heating has been widely used for decades for this purpose.

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Benefits of Using Induction Heating  for Hardening 

Induction heating uses a precise electromagnetic field to raise and hold the temperature of your material to the required level for your hardening process. 

This can help you meet tight production tolerances with precise, repeatable localized hardening for faster heating cycles without having to rely on open flame or the restrictions of batch processes.

Free Induction hardening Application Notes

Select from our collection of hardening notes, taken from years supporting our customers. Read how we helped to solve their process heating challenges.

image: Hardening surgical blades Hardening surgical blades

To quickly heat a steel surgical blade to 2000°F (1093°C) within 2 seconds so as to harden the blade edge.

image: Hardening Seat Belt PartsHardening Seat Belt Parts

A four-turn helical concentrating coil is specially designed to deliver uniform heat to the steel seat belt retraction gear.

image: Hardening the teeth of a large saw bladeHardening the teeth of a large saw blade

A torch isn't as precise as induction nor is it repeatable; induction heating is highly repeatable, uses less energy than a torch and offers instant on/off heating

image: Case hardening a steel fitting (machined parts manufacturer)Case hardening a steel fitting (machined parts manufacturer)

The coil design enabled the part to be raised into the heating coilfrom the bottom. The design was also made to ensure it will work well within the customer's current setup...

image: Surface hardening of steel screwsSurface hardening of steel screws

Induction heating enables precise application of heat, faster process time and production rates and the ability to be incorporated into existing production lines

image: Hardening teeth on a steel motorcycle gearHardening teeth on a steel motorcycle gear

A single turn helical coil is used to heat the gear. The gear is placed on a spindle and rotated at 300-350 RPM's.

image: Hardening steel screw threadsHardening steel screw threads

A five turn helical coil is used heat the screw threads. The screw is placed in the coil, heat is applied for 8 seconds to achieve a 2 long zone at the required hardness.

image: Hardening the end of steel hand-held marking stampsHardening the end of steel hand-held marking stamps

To harden various size ends of hand held marking stamps. The area to be hardened is 3/4 (19mm) up the shank.

image: Hardening of Steel Cam AssemblyHardening of Steel Cam Assembly

Hardening the cam outer surfaces with induction results in uniform heating for uniform results, one coil can be used for many geometries, consistent results from piece to piece

image: Case Hardening of Armature ShaftCase Hardening of Armature Shaft

A five turn helical coil is used to heat the gear end of the shaft to 1700°F

image: Hardening Cast Iron PulleysHardening Cast Iron Pulleys

Heat cast iron pulleys to 1600°F(871.1°C) in order to achieve a hardness of 55 Rockwell C.

image: Hardening Stainless Steel Surgical Knife BladesHardening Stainless Steel Surgical Knife Blades

A two turn helical coil with an internal quartz tube designed to scan the length of the blade is used to heat the blade to 1850°F (1010°C) to achieve the desired hardness.

image: Hardening Bed Knife Blade for Reel Type Lawn MowersHardening Bed Knife Blade for Reel Type Lawn Mowers

The hardness desired is between 45 to 55 Rockwell C, and should be measured 0.062in (1.6mm) from the cutting edge.

Frequently Asked hardening Questions

Induction hardening Resources:

Select from our libraries of materials to help you better understand the benefits hardening with induction heating can bring to your process.

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