The unqualified flaw detection of EH36 marine steel plate is due to serious segregation in the center of the steel plate, serious C, Mn, P segregation and large-size MnS inclusions and (Nb, V, Ti) compound aggregation on the segregation zone, and martensite and bainite after rolling Body abnormal tissue, resulting in stress concentration cracking.
Improve the cleanliness of molten steel by controlling the content of P and S in the EH36 marine steel plate, strengthen the ladle control to ensure the effect of bottom blowing and ventilation, strengthen the LF and RH operation to improve the hit rate of the alloy, and control the appropriate time for ladle molten steel to cool down; properly reduce the superheat of molten steel, optimize The heating system of the heating furnace can improve the segregation degree of the billet center.
By optimizing the steel rolling process, adopting fine-grain rolling and weak cold matching, the formation of martensite and bainite abnormal structures in EH36 marine steel plate can be reduced or avoided.
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