Hot-rolled steel is steel molding process, they have a great impact on the performance of seamless steel, rolled steel, hot-rolled mainly based. Hot-rolled steel are some defects in the production process.

First, drawback After hot rolling, the steel inside the non-metallic inclusions (mainly sulfides and oxides, as well as silicate) was pressed into a sheet, delamination (interlayer) phenomenon. Layered in the thickness direction of the steel tension performance deteriorated significantly, and there may be an interlayer tears during the weld shrinkage. Weld shrinkage induced local strain often strain to reach the yield point several times larger than the load-induced strain.

Second, the residual stress caused by uneven cooling. Residual stresses in the absence of external force internal self equilibrium stress, hot-rolled steel has a variety of cross-section of such residual stresses, the greater the cross-sectional dimension generally steel, the residual stress is greater. Although the residual stress is self-balanced, it still has some influence on the performance of the steel members under loads. As for the aspect of deformation, stability, anti-fatigue and so are likely to have adverse effects.