1. Plasticity

The plasticity of steel generally means that after the stress exceeds the yield point, it has the property of significant plastic deformation without fracture. The main index to measure the plastic deformation capacity of steel is elongation δ And reduction of area ψ。

2. Cold bending performance

The cold bending performance of steel is to measure the resistance of steel to cracks when plastic deformation occurs during bending at room temperature. The cold bending performance of steel is to test the bending deformation performance of steel under the specified bending degree by cold bending experiment.

3. Strength

The strength index of steel is determined by elastic limit σ e. Yield limit σ y. And tensile limit σ u. The design is based on the yield strength of steel. High yield strength can reduce the self weight of the structure, save steel and reduce the cost.