First, mechanical properties

1. Tensile performance

Steel has high tensile properties. Drawing is the main force form of construction steel. Therefore, the tensile property is an important indicator of the performance of steel and the selection of steel.

(1) Elastic stage. The A's in the curve are a straight line. The stress is proportional to the strain. If the external force is removed, the specimen can return to its original shape. This property is elasticity, and the deformation at this stage is elastic deformation.

(2) Yield stage. When the stress exceeds point A. Stress and strain are no longer proportional,

The steel force is greater than the yield point. Large plastic deformation will occur. Although the steel has not been damaged. However, due to excessive deformation, it can not meet the requirements of use. Therefore, the yield strength is the main basis for determining the allowable stress of steel structures. It is a very important parameter in engineering structure calculation.

(3) Strengthening stage. When the stress exceeds the yield strength. Due to the distortion of the lattice in the internal structure of the steel. Preventing further lattice slippage. The steel is strengthened.

2. Impact primitivity

Impact toughness refers to the steel under instantaneous load. The ability to resist destruction. It is expressed by the work (J/cm2) consumed on the unit of the gap when the specimen is thrust. Its symbol is. The specimen is placed on a fixed support during the test. Then the pendulum strikes the back of the groove of the specimen. Make the specimen bend and break under impact. For example. Obviously, the greater the value of.0k. Indicates the more work consumed when punching the specimen. The better the impact toughness of the steel.

3. Fatigue resistance

Steel under the repeated action of alternating loads. Failure often occurs when the Z stress is much less than its tensile strength. This failure is called steel fatigue failure. The dangerous stress in case of failure is the Z large stress within the specified period (the number of times of repeated action of alternating loads). It is called fatigue limit or fatigue strength. At this time, the specified period N is the fatigue life of the steel. When designing structures that are subjected to repeated loads and need to perform fatigue checking calculations. The fatigue limit of the steel used should be known.

Second, process performance

Good process performance. Can ensure that the steel smoothly through various processing. The quality of steel products is not affected. Cold bending, cold drawing, cold drawing and welding properties are important process properties of construction steel



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