Cr12MoV Tool Steel

Introduction to Cr12MoV Tool Steel

1. Overview

Cr12MoV is a high-carbon, high-chromium cold-work tool steel widely used in applications requiring high wear resistance, toughness, and dimensional stability. It is commonly employed in the manufacturing of cold-work dies, punches, and other precision tools.

2. Chemical Composition

The chemical composition of Cr12MoV steel includes:

Carbon (C): 1.45-1.70%

Chromium (Cr): 11.00-12.50%

Molybdenum (Mo): 0.40-0.60%

Vanadium (V): 0.15-0.30%

Silicon (Si): ≤0.40%

Manganese (Mn): ≤0.40%

These elements contribute to the steel's high hardness, wear resistance, and toughness.

3. Physical Properties

Density: 7.7 g/cm³

Thermal Expansion Coefficient: 10.4 x 10⁻⁶/°C (20-100°C)

Thermal Conductivity: 20.0 W/m·K (20°C)

Elastic Modulus: 210 GPa

4. Mechanical Properties

Hardness: After proper heat treatment, Cr12MoV steel can achieve a hardness of 58-62 HRC.

Tensile Strength: Approximately 2000 MPa

Yield Strength: Approximately 1800 MPa

Elongation: Approximately 5%

5. Heat Treatment Process

The heat treatment process for Cr12MoV steel includes annealing, quenching, and tempering:

Annealing: Heat to 850-870°C, hold, and slowly cool to achieve a hardness of 220-240 HB.

Quenching: Heat to 980-1030°C, then cool in oil or air to achieve a hardness of 60-62 HRC.

Tempering: Temper at 180-220°C to achieve a hardness of 58-60 HRC.

6. Applications

Cr12MoV steel is primarily used in:

Cold Work Dies: Such as blanking dies, forming dies, and trimming dies.

Punches: For stamping and piercing operations.

Shear Blades: For cutting and shearing applications.

Precision Tools: For high-precision machining and tooling.

7. Advantages

High Wear Resistance: Excellent wear resistance, making it suitable for high-stress applications.

High Hardness: Achieves high hardness after heat treatment, ensuring long tool life.

Good Toughness: Maintains good toughness even at high hardness levels.

Dimensional Stability: Excellent dimensional stability during heat treatment and use.

8. Precautions

Heat Treatment Control: Strictly control heat treatment processes to avoid overheating or overcooling.

Surface Treatment: Surface treatments such as nitriding or chrome plating can enhance wear and corrosion resistance.

Usage Environment: Avoid using in excessively high temperatures or corrosive environments to prevent material degradation.

9. Conclusion

Cr12MoV tool steel, with its exceptional wear resistance, high hardness, and good toughness, is the material of choice for cold-work dies and precision tools. Through proper heat treatment and surface treatment, the service life and performance of Cr12MoV steel tools can be further enhanced, meeting the demands of various high-stress and precision applications.