D2, also known as SLD, is a high-carbon, high-chromium tool steel renowned for its exceptional hardness, wear resistance, and ability to hold a sharp edge. It is widely used in cold forging and other cold work applications that require superior wear resistance and strength. D2 steel can be air-hardened and has good dimensional stability after heat treatment, making it a popular choice for precision tools.
Key Characteristics:
Composition: Typically contains about 1.5-1.6% carbon, 11-13% chromium, along with molybdenum and vanadium, which enhance hardness, wear resistance, and toughness.
Hardness: Can achieve high hardness levels of 58-62 HRC after heat treatment, making it suitable for demanding cold work applications.
Wear Resistance: Excellent wear resistance, ideal for high-abrasion environments and long tool life.
Toughness: Good toughness, although slightly lower than some other cold work steels, but sufficient for many high-stress applications.
Dimensional Stability: Maintains excellent dimensional stability during hardening and tempering, essential for precision tooling.
Common Applications:
Cold forging dies and punches
Stamping, blanking, and shearing dies
Cutting tools and industrial knives
Thread rolling dies
High-wear machine parts
D2 / SLD is a preferred material in tooling and die industries for its balance of hardness, wear resistance, and toughness. It is especially valued in applications requiring tools that can maintain sharp edges and withstand heavy use in abrasive conditions.