HWL expands capacities

Now with new large facility for Plasma nitriding

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Vacuum hardening


Vacuum hardening

Deep hardening under vacuum atmosphere
Austenitising temperatures up to max. 1400°C
Quenching in nitrogen overcompression

  • Bright surfaces
  • Very good reproducibility
  • Distortion-resistant through mild quenching medium

Vacuum hardening in performed in state-of-the-art process control computer facilities in our company.

Capacity, sizes

Components/workpieces with dimensions of up to max. Rd. 600x600

Batch documentation/thermal treatment diagrams.

Application fields:

Especially suited for moulds and tools made of hot and cold-work steel (e.g. 1.2379, 1.2343,1.3343…)


Drawing is a form of annealing used to increase the toughness of a hardened component to an extent that ensures ductility which occurs due to strain. The resulting loss of hardness is accepted and also serves to set the nominal hardness required by the customer.

Several drawing treatments may be required to achieve optimum mechanical properties.

A special drawing treatment is the so-called drawing in secondary hardness maximum, which allows subsequent surface treatment of suitable materials (e.g. plasma nitriding or TIN coating) at higher temperatures without loss of hardness.

We perform drawing under shield gas, vacuum or air atmosphere.

All drawing facilities are programme-controlled. Time-temperature diagrams can be generated.


Annealing is a generic term for a large number of different annealing methods. Annealing is used to set specific mechanical or physical properties in the material. In general, an annealing process does not increase the strength of the material. The essential annealing methods are:


Normalizing is mainly used on cast, hot-formed or welded workpieces in order to remedy irregular and coarse-grained weld structures, which leads to better mechanical properties. Normalizing is performed at 850 - 950°C and can be repeated several times if necessary (cyclic annealing).

This results in a fine-grained weld structure with more or less fine ribbon perlite.

Stress relief annealing

Workpieces made of ferrite materials may show internal stress caused by various methods (e.g. welding, cold forming, machining) in macroscopic or microscopic ranges, which almost reach the material's yield point.

As a result, the dimensions and shape of a workpiece may change or microscopic and macroscopic cracks may occur that may lead to breaking. This internal stress may result in excess distortion especially in later thermal treatment. For this reason, affected parts should always be stress relief annealed at temperatures between 500 - 650°C after initial machining.

Soft annealing

Steel materials with medium to high carbon contents are soft annealed for further processing to facilitate this. Spheroidizing is a special form of soft annealing. In order to prevent undesired surface effects, all annealing methods can be performed under shield gas or vacuum.Unser Ofen

All annealing work is performed on state-of-the-art systems.