Cold bending cracking of SPA-H steel plate will generate a lot of loss. Therefore, SPA-H steel plate suppliers put forward a lot of control measures for cold bending cracking of SPA-H steel plate.
1. Accelerating the cooling rate of molten steel during solidification, slowing down the degree of element segregation, reducing the concentration difference of segregation, especially the rapid cooling time may reach the state of non-segregation.
2. The higher soaking temperature and longer soaking time should be adopted according to the actual production, which is beneficial to the diffusion of solute elements, makes the composition of SPA-H steel plate tend to be uniform, and prevents the formation of banded structure fundamentally.
3. Hot rolling with high temperature and large deformation makes the solute element segregation zone flattened and elongated into strips, which reduces the distance between solute enrichment zone and solute depletion zone, promotes the composition homogenization of austenite zone, and reduces the concentration difference between solute-rich zone and solute-poor zone.
4. Controlling the cooling rate after austenite processing or heat treatment, increasing the cooling rate can make the Austenite-ferrite transformation complete before the formation of pearlite in the solute enrichment zone, avoid the formation of ferrite/pearlite banded structure and reduce the strip structure on the surface of SPA-H steel plate.
5. SPA-H steel plate is sensitive to oxygen content in steel. Aluminum deoxidization is adopted and most of oxide inclusions in SPA-H steel plate exist in the form of alumina. Therefore, by controlling the total oxygen content in the steel water, the alumina inclusions in the SPA-H steel plate matrix can be reduced.
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