When the steel plate is processed in the later period, the deformation will be caused by the warping, which causes the work piece to be scrapped, which affects the normal use of the user and causes the economic loss of the enterprise. It is considered that there is residual stress in the inner and upper surface of the steel plate after hot rolling. If the residual stress is uneven distributed along the width and length of the steel plate, it will produce a torque on the section of the steel plate, causing the steel plate to warp after cutting. The control measures are:
1. Due to the use of ultra fast cooling, the nucleation rate was improved and ferrite grain was refined. The super fast cold state is kept near the phase transition point to stop cooling, and then the cooling path is controlled to get the excellent performance steel plate.
2. Cooling temperature
The problem of internal stress imbalance caused by laminar cooling is mainly caused by 3 kinds of non-uniform cooling: severe non-uniform cross cooling, asymmetric thickness direction, uneven cooling in transverse direction and thickness direction.
3. Cold straightening
The straightening plate can improve the residual stress distribution, when the steel plate is uneven stress distribution in cross section, may need to take measures to increase the bending method of local deformation to compensate for the uneven length of longitudinal fibers, to eliminate the wave bending and uniform stress to steel plate.
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