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EMG IMPOC – Measurement of tensile and yield strength

IMPOC Sensor heads

EMG IMPOC is a tried and tested, magnetic-inductive measuring system for automatic, non-destructive online determination of the mechanical properties (tensile strength and yield point) of ferromagnetic steel strip material.

Areas of application include the production of cold-rolled and surface-coated steel strip material, for example, in:

  • Hot-dip galvanising lines 
  • Continuous annealing lines 
  • Tinning lines
  • Continuous pickling lines*
  • Processing lines*

*on request

The use of the EMG IMPOC system simplifies the evaluation of the quality of the strip and enhances quality assurance during the production process. EMG IMPOC enables continuous evaluation of the mechanical properties over the entire length and width of the strip. If one or more mechanical characteristics exceed their defined limit values, the corresponding strip areas will be notified so that optional additional tests can be carried out. The EMG IMPOC system also allows the operator to vary the process parameters that influence the mechanical characteristics during the production process and to ensure the strip is produced in the required quality.

Measuring principle:

The IMPOC system is based on two identically constructed measuring heads that are arranged on the upper and lower side of the strip. Each measuring head is comprised of a magnetising coil and a high-sensitivity magnetic field sensor. The measuring cycles consist of a local and periodic magnetisation of the running strip by the two magnetising coils. The magnetic field sensors then measure the gradient of the residual magnetic field strength on the upper and lower side of the strip. The mechanical parameters of the steel strip (i.e. tensile strength and yield strength) can then be assigned to this gradient via correlations.

Customer benefits:

  • Safeguarding of product quality
  • Cutting optimisation
  • Increase in yield
  • Reduction of destructive material testing
  • Material selection according to quality criteria
  • Optimisation of the annealing process
  • Optimisation of the rolling and skin pass process
  • Statements regarding the degree of recrystallisation

For further detailed information and technical data, please refer to our product brochure.