Corrosion, acid and heat resistant steels meet the highest demands. They are highly resistant to corrosive and mechanical stress, and have high strength and strain values. Their high quality ensures long-lasting security.


Ferritic steels are almost exclusively pure chromium steels with a chromium content of 12-18%. The carbon content is less than 0.1%.

Their most important properties include inter alia good weldability and that these steels are magnetic; they cannot be hardened or treated with heat.

Martensitic steels are part of the chromium steels, which, depending on the quality, have had nickel (0.5-2.5%) and molybdenum (<1.2%) added. The carbon content is 0.1-1.2%. Their most important properties are inter alia that these steels are magnetic and can be thermally hardened and tempered. As a general rule, they cannot be welded. Austenitic steels are subdivided into chromium-nickel steels (e.g. 1.4306 and 1.4541) and chromium-nickel-molybdenum steels (e.g. 1.4436 and 1.4571).

These steels are suited to almost all areas of application as they can be easily deformed and processed. They are non-magnetic.


Chromium Cr

Chromium as a carbide former prevents corrosion of the material by forming a passive layer together with oxygen.

Carbon C

Carbon increases strength and, in martensitic steels, hardening capabilities. It stabilises the austenitic structure.

Nickel Ni

Nickel Ni. This improves corrosion resistance and the absorbed energy. From a content of 7%, it converts the structure from ferrite to austenite.

Molybdenum Mo

This increases acid resistance as well as the strength of the steel. Molybdenum is a ferrite binder.

Titanium Ti

Titanium Ti. Titanium is a carbide former and is added to the alloy as a stabilising element in order to bind the carbon. As a result, greater resistance to intercrystalline corrosion is achieved without heat treatment after welding.

Niobium Nb

Niobium, like titanium, is a stabilising element.

Manganese Mn

Manganese increases strength. The resistance to wear is also increased

Nitrogen N

The addition of nitrogen stabilises the austenitic structure and increases strength.

Sulphur S

Sulphur improves machinability. Weldability decreases due to sulphur.


Yield strength and yield point Rp 0.2% and Rp 1.0%

This refers to the tension related to the initial cross-section of the tensile test sample, which effects a steady plastic deformation of

0.2 and 1% to the starting length.

Tensile strength Rm

This refers to the tension related to the initial cross-section of the tensile test sample, which causes a break in the material.

Elongation at break A

This refers to the remaining elongation following a break in the sample in a tensile test.

Reduction in area Z

This value describes in terms of percentage the reduction in the cross-section measured in the tensile test compared with the original sample cross-section.

Absorbed energy KV

This value states in joule the energy that was consumed in the impact test.

Hardness HB, HV, HR

Hardness is the resistance of a workpiece surface to a harder penetrating body.