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Analysis of the reasons for the failure of DNV Grade A marine steel plate inspection

DNV Grade A marine steel plate is mainly used for the manufacture of various marine facilities and various marine engineering equipment. Due to the harsh working environment, it needs to withstand greater wind and wave impacts and alternating loads. In order to ensure the safety and reliability of the hull structure and offshore equipment, in addition to the requirements of DNV Grade A marine steel plate with good strength, plasticity and toughness requirements, it also needs to have good internal quality, and there should be no cracks, shrinkage holes and interlayers that affect the safety of use. Hazardous defects.

According to the experiment, it is concluded that the crack is the direct cause of the non-conformance of the DNV Grade A marine steel plate, but it is necessary to further analyze the cause of the micro-crack, so as to avoid the recurrence of this problem.

It can be seen from the analysis that the existence of micro-cracks is the direct cause of the non-conformity of the DNV Grade A marine steel plate. The root cause of flaw detection. In order to improve the flaw detection problem of DNV Grade A marine steel plate, it is necessary to improve the segregation at the center of the steel plate while controlling the size and quantity of MnS and (Nb,Ti)N inclusions in DNV Grade A marine steel plate.