Cause Analysis of Crack on Side Strip of DP780 Hot Rolled Coil
In order to study the cause of the crack on the side of DP780 hot rolled coil,crack samples of two kinds of steel coils are taken for fracture analysis,metallographic observation and electron microscope analysis.The results show that the fracture structure is ferrite+pearlite,no martensitic structure,uniform grain size,no obvious decarburization,no oxidation particle,no segregation element enrichment.In addition,the cutting angle of the billet is compared with the test results,and it is found that the cutting angle of the billet has no improvement effect on the crack.The analysis shows that the crack of the side strip of DP780 hot rolled coil is caused by the rolling in low plastic zone due to the low temperature of the finishing rolled edge.
hot rolled coilcrack on side stripcut angle of the billetlow plasticity zone rollingmicrostructure
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