Magnetic Permeability Measurement is a specialised non-destructive evaluation technique used to assess changes in magnetic properties of ferromagnetic materials. Variations in magnetic permeability are often associated with material degradation, metallurgical changes, or exposure to damaging service conditions.
This service is commonly used as a screening and diagnostic tool to identify metallurgical degradation such as carburisation, decarburisation, heat treatment anomalies, and material ageing.
Why Magnetic Permeability Measurement Is Required
Many metallurgical changes alter the magnetic behaviour of materials before mechanical properties degrade visibly. Magnetic permeability measurement helps detect early-stage material degradation that may not be identified through conventional inspection methods.
This technique provides a fast and non-intrusive means of assessing material condition and identifying areas requiring detailed investigation.
Scope of Inspection
Magnetic permeability measurement is applicable to:
Carbon steel and low-alloy steel componentsHigh-temperature piping and pressure equipmentFurnace, reformer, and heater componentsComponents susceptible to carburisation or decarburisationHeat-treated and service-exposed materials
Inspection Methodology
Magnetic permeability measurement is performed by applying a controlled magnetic field to the component surface and measuring the material’s magnetic response. Variations in permeability values indicate changes in material microstructure or composition.
Measured data is compared against baseline or reference values to identify abnormal zones. The results are analysed by metallurgical and integrity specialists to determine the significance of observed changes and the need for further inspection or corrective action.
Key Benefits
This service enables early detection of metallurgical degradation, rapid screening of large areas, non-intrusive inspection, and effective identification of high-risk zones for further evaluation.
Industries and Applications
Magnetic permeability measurement is widely applied in refineries, petrochemical plants, power generation facilities, fertilizer units, and high-temperature process industries.
Magnetic Permeability Measurement provides valuable insight into material condition through magnetic property evaluation. By identifying early-stage degradation, this service supports proactive integrity management and failure prevention.
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