Because DNV DH32 marine steel plate requires good low temperature impact toughness and low brittle transition temperature. Therefore, the high-strength DNV DH32 marine steel plate has requirements for aluminum content and microalloying. In order to ensure the good welding performance of DNV DH32 marine steel plate, it is necessary to control the upper limit of carbon equivalent; according to the comprehensive performance requirements of high-strength marine plate, determine the composition control range of DNV DH32 marine steel plate.
The selection of microalloying elements should not only consider the strengthening effect of microalloying elements, but also not have an adverse effect on the structure of DNV DH32 marine steel plate. The influence of microalloying elements on the brittleness transition temperature of DNV DH32 marine steel plate is also an important factor. The effect of the purity of DNV DH32 marine steel plate on the toughness of high-strength ship plate, especially the low-temperature toughness, is the key technology for control in smelting.
