Cr12MoV Round Bar

Cr12MoV Round Steel is a high-carbon, high-chromium ledeburitic cold-work die steel. Common international equivalent grades include SKD11 (Japanese JIS standard) and D3(American AISI/SAE standard).

Physical and Mechanical Properties

• Hardenability: High hardenability; sections under 300–400mm can be fully hardened.

• Hardness: Annealed hardness ranges from 207–255 HB (indentation diameter 3.8–4.2mm); quenched hardness reaches ≥ 58 HRC.

• Durability: Wear resistance is approximately 3–4 times that of ordinary low-alloy steels.

• Stability: Maintains thermal stability up to 520°C, with impact toughness superior to Cr12 steel.

Heat Treatment Specifications

• Quenching: Typically performed at 950–1050°C using oil or gas quenching.

• Tempering: Low-temperature tempering at 160–180°C for 2 hours, or multiple tempering cycles at 325–375°C to stabilize the microstructure.

• Cryogenic Treatment: Can be applied to refine carbide precipitation, enhancing wear resistance and dimensional stability.

Applications

It is widely utilized in manufacturing large-section, complex-shaped cold-work dies, such as punching dies, deep drawing dies for steel plates, cold extrusion dies, measuring tools, and wire drawing dies. By employing multi-directional forging to improve carbide segregation, and combining it with salt bath vanadium-carbiding or nitriding treatments, the service life can be extended to over 800,000 cycles.