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  • Case Depth Testing and Analysis
  • Case Depth Testing and Analysis

    In order to modify the surface of the metal material to improve its hardness, wear resistance or corrosion ability, the surface is carburized, nitrided, carbonitrided, boronized or surface quenched. The microstructure determines the macro performance of the metal material, and the case depth determines the area affected by the specific performance. As a professional reliability third-party testing organization, T,C&A Lab can perform case depth testing on metals according to ISO, ASTM and other standards. Welcome to contact our experts for consultation.

    T,C&A Lab's methods for determining case depth

    • Chemical Method

    This method is usually only suitable for carburized cases, but may be used for cyanided or carbonitrided cases. The procedure includes determining the carbon content at each depth below the sample surface. This method is considered to be the most accurate way to measure the total case depth.

    Flow: Layer by layer sampling--chemical analysis--calculation

    • Hardness Method

    Generally, this method is considered as one of the most advanced and accurate case depth measurement methods. This is the preferred method to determine the effective case depth and can be effectively used for all types of hardness case.

    Flow: Cutting--polishing--hardness testing--drawing hardness curve--calculation

    • Metallographic method

    It can be divided into macroscopic metallographic method and microscopic metallographic method.

    Macroscopic metallographic method: It is recommended to use the magnification method to determine the case depth. It has the added advantage of being applicable to all types of cases.

    Microscopic metallographic method: Microscopic methods are usually used in lab and need to be fully set up for polishing, etching and microscopic examination. The examination is usually carried out at 100 diameters.

    Flow: Cutting--polishing--erosion--drying--observation and evaluation

    Standards we test to

    ASTM B934Standard Test Method for Effective Case Depth of Ferrous Powder Metallurgy (PM) Parts Using Microindentation Hardness Measurements
    ASTM B721Standard Test Method for Microhardness and Case Depth of Powder Metallurgy (P/M) Parts
    ASTM B931Standard Test Method for Metallographically Estimating the Observed Case Depth of Ferrous Powder Metallurgy (PM) Parts

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

    Instruments and data

    Case Depth Testing and Analysis 1
    Case Depth Testing and Analysis 2
    Case Depth Testing and Analysis 3


    1. Łępicka, et al. The initial evaluation of performance of hard anti-wear coatings deposited on metallic substrates: thickness, mechanical properties and adhesion measurements – a brief review[J]. REVIEWS ON ADVANCED MATERIALS SCIENCE, 2019, 58(1):50-65.
    2. Czerwinski, F. Thermochemical Treatment of Metals[M]// Heat Treatment - Conventional and Novel Applications. 2012.

    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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