• nl
  • This is, in short, the tension (in N/mm² (MPa,)) from which the steel will deform plastically, and will therefore no longer fully 'bounce back' to its original shape once the tension is removed.

    In the study of the mechanical properties of steel, plastic deformation is referred to as the ‘flow’. The yield strength of a steel, expressed in N/mm² (MPa), is used in calculations of the strength of construction parts. The yield strength of a particular grade of steel can be determined by running a normalised tensile test to match the stress and the elongation in a diagram (stress-strain curve).