The three important indicators of the mechanical properties of steel are:

1. yield strength (or yield point); 2. tensile strength; 3. elongation.

The role:

1. Yield strength: is a measure of the bearing capacity of the steel structure and determine the design value of the strength of the important indicators.

2. Tensile strength: is a measure of steel resistance to pull off the performance indicators, it is not only a general strength indicators, but also directly reflects the internal organization of steel, and fatigue strength has a close relationship.

3. Elongation: a measure of the plastic properties of steel index