Properties of Structural Steel

The properties of steel required for engineering design may be classified as

  1. physical properties
  2. mechanical properties

Physical properties: Irrespective of its grade physical properties of steel may be taken as given below

  1. Unit mass of steel = 7850 kg/m^3
  2. Modulus of elasticity, E = 2.0 x 10^5 N/mm^2
  3. Poisson ratio = 0.3
  4. Modulus of rigidity G = 0.769 x 10^5 N/mm^2
  5. Coefficient of thermal expansion = 12 x 10^-6 per degree Celsius.

Mechanical properties:

  1. Yield stress fy.
  2. The tensile or ultimate stress fu.
  3. The maximum percentage elongation on a standard gauge length
  4. Notch toughness.

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