What are the commonly used indexes to measure the mechanical properties of steel?

Four indexes to measure the mechanical properties of steel;

1.

Strength: the ability of steel to resist excessive (plastic) deformation and fracture under external force. Some maximum values of stress are also some stress characteristic points on the constitutive relation curve of materials.

Exponent: yield point fy(σs)

Ultimate strength fu(σb)

Elasticity: the property that steel deforms under the action of external force and returns to its original state after the external force is cancelled.

Indicators: proportional limit fp, elastic limit fe and elastic modulus E.

σ