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Brinell Hardness Test

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Definition: The Brinell hardness test is a static indentation method for determining the hardness of metallic materials. A carbide ball is pressed into the surface with a defined test force, and the indentation diameter is measured optically. The method is standardised in DIN EN ISO 6506.

Practical relevance: The hardness is given as HBW (Hardness Brinell Tungsten carbide), e.g. HBW 10/3000. The method is particularly suitable for soft to medium-hard materials such as structural steels, cast iron or non-ferrous metals. Test force, ball diameter and dwell time are relevant to the assessment. The Brinell hardness frequently correlates with tensile strength and is used for incoming goods inspection or component testing.

Decision-making perspectives:

  • Technical decision-makers: Checking heat treatment conditions and the homogeneity of larger components.
  • Purchasing/project management: Specifying required hardness ranges in material standards or orders.
  • Science: Comparison with other hardness methods (Vickers, Rockwell) and correlation with mechanical characteristic values.
  • Insurance/law: Documented hardness verification for assessing material deviations.

Typical testing or verification methods: Optical indentation measurement, calibration in accordance with ISO 6506-2, comparative measurements with reference blocks.

FAQ:

  • When is the Brinell hardness test preferably used?
  • For coarse-grained or inhomogeneous materials as well as for larger components with medium hardness.
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