Abstract
1. The strength, ductility, and impact strength of structural steel are interrelated not only qualitatively but also quantitatively. 2. The interdependence characteristic K is represented by a hyperbola; whenaH > 6 kgm/cm2 this relationship is close to a linear relationship. In many cases it is close to a constant value K=150 whenaH ≈ 10 kgm/cm2. 3. Cold brittleness and some other embrittlement factors do not disagree with this relationship because the dependence K = σbδ5/aH retains the shape of a hyperbola in this case also. For a specific steel this dependence can be expressed in terms of σT and Ψ, using the relationships σT/σb and Ψ/δ
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