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Your advantages

  • Our own laboratory and cooperations with renowned institutions, such as Federal Institute for Materials Research (BAM, Berlin), Material Testing Office (MPA Hannover and Karlsruhe), University of Dortmund, IFBT Leipzig, Technical College Bielefeld and many others, makes us one of the leading specialists for special applications and developments in the field of stainless steel.
  • We make sure you quickly and reliably receive the necessary test certificates for all structures made of stainless steel
  • These testing capabilities are an important component towards maintainment and advancing in consistent product development.
    The material stainless lean duplex 1.4362 is a good example. Mr. Modersohn had 1.432 tested and officially approved in 2002, for the first time in Germany.
    With this a new, technically better material was brought onto the market for fixing technology sectors.


Mobile material analysis for East Westphalia. Fast service for customers and suppliers


Your advantages

  • We constantly check incoming goods and do spot checks any time during production in order to secure material quality.
  • The test with the Niton fluorescence device is non-destructive and very accurate.
  • The mobility of the device also enables testing on the construction site or at the customer's premises.

We offer our customers an even more comprehensive service: With the help of a mobile tester, an essential part of the stainless steel can be determined. Within a short time the question of the quality of the material is clarified.

In industry and trade, growing interest in reliable information on the quality of material prevails. Lifes can depend on correct material grades: Just imagine what, for example, could happen if an incorrect material is used in façade fixing.

A new technology from the United States, which was developed for NASA (using the Mars robot!) and works with x-rays, provides reliable information. The "Niton" device recognizes chemical elements in metal alloys (in the element area Titanium Uranium) quickly and precisely and the information is at your fingertips.

Sheets, wires, pipes, tubes and welded constructions, incl. the welds, can be tested. Standard elements for the test are: SI, P, S, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Hf, Ta, W, Re, Pb, Bi, Pd, Ag, Sn.

If necessary, we can investigate further existing elements such as Al, Cl, P, S, Si and Mg for you.

The acquisition of such a device is expensive. We have procured it for quality assurance in the incoming goods inspection. For example, to clearly identify the new lean duplex steel. Then we had the idea to offer the tester for renting as a "mobile task force". The temporary rental of our equipment and the operator is an inexpensive alternative, especially if the permanent acquisition is not economically viable.

Numerous companies throughout East Westphalia make use of the possibility of simple alloy analysis / verification inspection, which can be ordered by phone or e-mail. Please ask!


Surface roughness measurement for sensitive surfaces


Your advantages

  • Fast and precise use at different sites on the surface
  • Control of surface quality, which substantially influences corrosion resistance
  • Can be carried out on site

Accurate and rapid determination of the surface roughness in microns!
The rapid and selective determination of the surface roughness plays an important role particularly in the medical or food industries due to hygiene regulations.It is becoming more and more evident and important that the definition of corrosion resistance properties is dependent on the surface quality and determination of the surface roughness. Of course, the roughness measurement is only one part of the total consideration area of surface quality.The type of marks and possible overlaps are not recognized by the roughness tester and have to be determined for the overall assessment. As research has shown, microscopic and cross-sectional analysis are also very important. Nevertheless, a first indication of the state of the surface is provided.

A coarse and poorly grinded surface, for example, material 1.4404, can result in poorer corrosion resistance properties than a smooth and well ground, or electropolished surface material such as 1.4301!

Therefore, the choice of surface is, in addition to the material selection, is the most important selection criteria to ensure proper corrosion resistance properties. The desired surface quality should be controlled and confirmed in the form of surface roughness test!

The surface is accurately tested within a measuring range of up to 12.5 mm. Various average roughness values can be calculated: arithmetic mean roughness Ra, root mean square roughness Rq, average roughness depth Rz, and more.


The determination of the mechanical properties of a material


Your advantages

  • Mobile and fast determination of the tensile strength.
  • Trust is good, control is better, especially when it comes to mechanical properties.
    The determination of strength values is, a fixings specialist, a basic part of his activity - you should have this in mind when shopping for your fixing products!
  • With its own testing equipment and, additionally, the testing equipment of our welding engineer, who works as laboratory director of the Technical College in Bielefeld, we can carry out all the strength and hardness tests very quickly.

Hardness and strength test

With simple testing devices it is now possible to determine, quickly and accurately, the hardness of a material using various methods. But that alone is, in many cases, not adequate since hardness does not necessarily have anything to do with the strength of a material.

The hardness measurement takes only the resistance to pressure, during penetration with a harder test specimen, into account. The toughness and the mechanical resistance opposing plastic deformation or separation remains unconsidered. Important strength values are determined by means of tensile and impact tests.

In addition to strength, material stiffness should be determined since it plays a role in design and elasticity of profiles. It is interesting to know that the stiffness of stainless steel decreases with an increase in strain hardening. For those looking for a stainless steel with high strength and stiffness, it must always be ensured that a high basic strength in the annealed condition is present.

Important test values are:

Hardness test:

  • Brinell HB
  • Rockwell HRC, HRA, HRB
  • Vickers HV

Strength test:

  • SYield strength Rp0.2 in N/mm2 – tensile strength Rm in N/mm2
  •  Elongation after fracture A5 in %
  • Notch impact energy J (Joule)(low temperature toughness measurement)


  • Modulus E in general, except for restraint forces in N/mm2
  • Modulus E restraint forces in N/mm2
  • Modulus of rigidity G in general, except for restraint forces in N/mm2
  • Modulus of rigidity G restraint forces in N/mm2

Radiographic test:

  • Dosimeter test (microsieverts)(radioactivity)




Leakage test with liquid penetrant test or the vacuum test method

Modersohn is able to test unique constructions made of satinless steel for leaks with WHG certification. Both the liquid penetrant (red-white-test) and the vacuum test methods (with carrying vacuum bells) are available from Modersohn.