PRECIPITATION HARDENING TYPED DIE STEEL WITH EXCELLENT TOUGHNESS AND CUTTING CHARATERISTIC AND MANUFACTURING METHOD THEREOF

摘要

A precipitation hardening type metal mold excellent in impact toughness and cutting workability satisfying the impact toughness, hardness, cutting workability and corrosion resistance criteria at the same time, and a manufacturing method thereof are introduced. The precipitation hardening type metal steel excellent in impact toughness and cutting workability according to the present invention is characterized in that it contains 0.03 to 0.09% of C, 1.0 to 1.5% of Si, 0.1 to 1.0% of Mn, 3.0 to 4.5% of Cr, 3.0 to 4.5% of Cr, , The balance being Fe and other unavoidable impurities, and having an impact toughness of 70 J / cm ² or more and a toughness of 70 J / cm ² or more, Hardness of HRC 38 or more and cutting workability of 80 cm ³ or more.