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  • Ferrite Testing

    Ferrite is a kind of crystalline structure existing in stainless steel or stainless steel welds, and its content determines the mechanical properties of the base metal and welds to a certain extent. Sometimes, too high ferrite content will adversely affect the properties of steel, such as destroying the uniformity of the structure, reducing the plasticity and toughness of the material, accelerating the aging rate of the material during creep and reducing the service life of the material. Therefore, it is of great significance to control the content of ferrite. As a professional reliability third-party testing organization, T,C&A Lab can perform ferrite testing according to ISO, ASTM and other standards. Welcome to contact our experts for consultation.

    T,C&A Lab's testing range

    • Austenitic stainless steel

    • Duplex stainless steel

    T,C&A Lab's ferrite testing methods include:

    • Metallographic method

    Through drilling holes or cutting points, and then the ferrite content is observed and calculated by metallographic microscope.

    • Magnetic method

    Ferrite content tester is used to determine ferrite content directly in base metal or weld metal. This method is based on the magnetic principle of ferrite. The ferrite tester provides convenience for the accurate measurement of ferrite content in stainless steel base metal or welds. The measurement results are in accordance with the international standard ISO-8249 and the American ANSI/AWS 4.2 standard.

    Standards we test to

    ISO 8249Welding — Determination of Ferrite Number (FN) in Austenitic and Duplex Ferritic-austenitic Cr-Ni Stainless Steel Weld Metals
    ASTM A799Standard Practice for Steel Castings, Stainless, Instrument Calibration, for Estimating Ferrite Content
    ASTM A800Standard Practice for Estimating Ferrite Content of Stainless Steel Castings Containing Both Ferrite and Austenite

    In addition, the experts in our Ferrite Testing Laboratory also provide a variety of custom testing services as your needs and requirements. Let's discuss the custom service with our experts for free.

    Instruments and data

    Ferrite Testing 1
    Ferrite Testing 2
    Ferrite Testing 3


    1. A Hosseini, V.; et al. Ferrite content measurement in super duplex stainless steel welds[J]. Welding in the World, 2018.

    Note: this service is for Research Use Only and Not intended for clinical use.


    T,C & A LAB is an independent lab providing quality or custom testing, characterization and analysis of a variety of materials. Our engaged experts are ready to help you.

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