Molten steel is subject to phase transformation during solidification, and the phase transformation products usually have different specific volumes. In the solidification process, the low carbon steel is affected by the solid phase change of ferrite and ferrite. The lattice changes from bcc structure to fcc structure, which improves the compactness of atomic structure. Volume reduction. The crystal lattice changes from face centered cubic structure to body centered cubic structure, the density of atomic structure decreases, the volume expands, and the solidified shell produces stress. When the flat plate is straight below 90 °, the disadvantages of phase change and straightness overlap and the risk of crushing increases.<br>
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