Disadvantages cf hot rolled steel
After hot rolling, the non-metallic inclusions In the steel are pressed into plates, and delamination occurs. Due to the tensile properties, the delamination of the steel in the thickness direction is significantly deteriorated, and may occur in the tearing between the welding shrinkage layers. The local strain caused by welding shrinkage often reaches several times the yield point strain, which is much greater than the induced load；
Residual stress caused by uneven cooling. Residual stress is the stress of internal self-balance in the absence of external force. Hot-rolled steel of various cross sections has residual stress. Therefore, the larger the cross-sectional size of the steel, the greater the residual stress. The residual stress is self-balanced, but the performance of steel components is still affected by external forces. Such as deformation, stability, and fatigue resistance may be adversely affected.
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Post time: Jul-09-2020