Analysis for the couse of Lower Performance of end Part of 10CrNi5MoV Steel plate

Aiming at the lower strength and toughness of end part of 10CrNi5 MoV steel plate, the causes were analyzed by re-heat treatment, microstructure observation and SEM. The rosults showed that alumina inclusions in steel maybe the cause for the lower performance of the end part of the steel. The properties of the steel at the point 0.5m away from the end part of steel are investigated and the results confirmed viewpoint above.