Heat treatment - Competencies

We get the best out of it for you

KERN LIEBERS offers comprehensive heat treatment processes worldwide to improve the material properties of our springs, stamped parts and stamped-bent parts and to meet your specific requirements. Our state-of-the-art facilities and experienced team ensure the highest quality and reliability. You can also use our heat treatment processes as contract manufacturing.

Heat treatment process

Diverse processes

Discover our wide range of heat treatment processes to optimize the material properties of your products:

Gas nitriding and gas nitrocarburizing
Nitriding of corrosion-resistant steels
Plasma nitriding and plasma nitrocarburizing
Expanite process: Nitrocarburizing and carburizing of corrosion-resistant steels
Case hardening, hardening, deep-freezing and tempering
Vacuum hardening
Induction hardening
Cleaning technology [SR1]

Services

Wire springs are mainly made from spring-hard round wires and profiles. Winding or coiling the spring introduces high residual bending stresses. These have a negative impact on the spring properties in terms of service life and usable tension stroke.

These are largely reduced by heat treatment adapted to the material. This results in an increase in the elastic yield strength of the material.

What we offer you:

We use defined heat treatment regimes to achieve the optimum properties of the springs. We use a variety of heat treatment systems with circulating air, inert gas and vacuum furnaces.
For special materials, e.g. in high-temperature applications, systems in the temperature range up to 1350°C are available. On request, we manufacture springs with special individual or piece hardening.

Flat springs are made from spring-hard steel strip. Plastic deformation of the strip introduces high residual bending stresses into the material.

These are largely reduced by heat treatment adapted to the material. At the same time, the initial strength is increased and the shape is stabilized. We use defined heat treatment regimes to achieve the optimum properties of the springs.

Hot tensioning and heat setting ensures minimized relaxation of the spring during operation due to higher tensions and temperatures during the process than in later use.

What we offer you:

Springs are clamped in so-called press shoes in templates or with spacers during heat setting. In this state, the springs are heat-treated in ovens.
During hot setting, springs are heated in the hot setting furnace in a free state and quenched with coolant while being pressed to a specified length.

Benefits