GB/T 1299 9CrWMn is a low-alloy cold-work tool steel with the following key characteristics:
High Hardness and Wear Resistance: With a carbon content of up to 0.95%, 9CrWMn achieves a hardness of up to 64 HRC after heat treatment, offering excellent wear resistance. It is suitable for manufacturing wear-resistant cold-work molds, such as stamping dies, drawing dies, and bending dies.
Low Deformation: This steel exhibits minimal deformation during quenching and excellent dimensional stability, making it ideal for producing small-section, complex-shaped, and high-precision molds, such as thin-sheet stamping dies and jewelry embossing dies.
Good Hardenability and Carbide Distribution: 9CrWMn has moderate hardenability with uniformly distributed, fine carbide particles, which enhance mold durability and surface quality.
Machinability: The steel offers good machinability, suitable for manufacturing complex-shaped mold components. However, during forging and heat treatment, rapid heating should be avoided to reduce the risk of cracking. Preheating to 650–750°C is recommended, with a forging temperature of 1130–1150°C and a final forging temperature not below 800–850°C.
Limitations: 9CrWMn is highly sensitive to cracking, requiring careful avoidance of rapid heating during forging. Welding is not recommended, as it may compromise performance.
