If the RINA AH32 ship steel plate has a high carbon content and contains alloying elements that increase the hardenability, it is more likely to lead to hardening and quenching, and due to the effect of phase change stress and thermal stress, it is easy to crack at the weld. Therefore, in order to produce cracks, it is necessary to reduce the carbon content of RINA AH32 ship steel plate, select and control the alloying elements properly.
The factors affecting the low temperature toughness of RINA AH32 ship steel plate are as follows:
1) When the carbon content is high, the quenchable turning temperature of RINA AH32 ship steel plate increases sharply, and the impact toughness decreases overall, so the carbon content is limited to less than 0.2%. In addition, the low temperature toughness of RINA AH32 ship steel plate can be improved by increasing the content of alloying element Mn and Ni.
2) The effect of deoxidization method and grain on low temperature cellular property: research shows that the low temperature toughness of killed steel is much better than that of rimmed steel, which is not only because the rimmed steel contains more oxygen and nitrogen, but mainly because the killed steel is aluminum deoxidized and the grain is fine.
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