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Synopsis: The effect of porosities on mechanical properties of plates rolled by heavy reduction and by light reduction per pass was investigated quantitavely in comparison with the effect of non-metallic inclusions. Compared with the strength and the toughness, the ductility such as the reduction of area in the tensile test and the upper shelf energy in the impact test is much more greatly affected by prosities than by elongated inclusions. It is possible to estimate the annihilating process of porosities from the viewpoint of the ductility as well as the ultrasonic examination.

Porosity Annihilation Process and Its Influences on Ductility of Rolled Steel Plates