DC53 steel is a new type of cold work mold steel. DC53 steel has overcome the disadvantages of SKD11 high-temperature tempering and toughness not enough, it will replace the applications of SKD11 in the common and precision mold field. The toughness of DC53 is double SKD11. DC53 toughness is on the top of the cold work mold steel. The things of cracking are rarely happen for the tools that made of DC53 material, it raises the service life dramatically. After high-temperature tempering, the residual stress of Wire EDM will get lower. So the cracking and deformation get control for the big size mold and high precision requirement mold Wire EDM. Its heat treatment hardness is also higher than SKD11, high-temperature(520-530℃) tempering can make the hardness up to 62-63HRC. Also, the strength and wear resistance of DC53 are better than SKD11 steel.