SKD11 is a high-carbon and high-chromium cold-working die steel, and SKD61 is a medium-carbon and high-alloy hot-working die steel. 2. The two are used in different scenarios. SKD11 is suitable for the production of some punches for hardware molds, and Skd61 is mainly used for the core material of die-casting molds. 3. The hardness after heat treatment is different. The hardness of SKD11 is about 58 degrees to 60 degrees, and the hardness of SKD 61 is between 48 degrees and 52 degrees. 4. The wear resistance and toughness are different. Under the same hardness, the wear resistance of SKD11 is better than that of SKD 61.