440C Stainless Steel Round Bar

440C stainless steel round bars offer exceptional hardness, wear resistance, and corrosion resistance, making them highly suitable for various industrial applications, especially in the manufacturing of knife blades, cutting tools, bearings, and surgical instruments.

With proper heat treatment, they can achieve maximum hardness and toughness, ensuring reliable performance in demanding environments.

Chemical Composition:

Physical Properties:

• Density: 7.80 g/cm³
• Melting Point: 1400-1425°C (2550-2600°F)
• Specific Heat Capacity: 460 J/kg·K (0-100°C)
• Thermal Conductivity: 24.9 W/m·K (100°C)

Mechanical Properties:

• Tensile Strength: 760-2030 MPa (110-295 ksi)
• Yield Strength (0.2% Offset): 450 MPa (65 ksi)
• Elongation at Break: 14%
• Hardness, Rockwell C: 58-62 HRC

Features:

• High carbon martensitic stainless steel with high hardness, wear resistance, and corrosion resistance.
• Offers excellent edge retention and sharpness, making it ideal for knife blades and cutting tools.
• Suitable for applications requiring high strength, such as bearings, valve components, and surgical instruments.
• Can be heat treated to achieve maximum hardness and toughness, providing excellent performance in demanding environments.
• Exhibits good resistance to corrosion in mild environments, but may not be suitable for highly corrosive conditions.
• Machinable in the annealed condition, but becomes significantly harder after heat treatment, requiring specialized tools for machining.
• Provides superior dimensional stability and surface finish after heat treatment, ensuring precision in manufacturing processes.

Heat Treatment:

• Annealing: Heat to 840-870°C (1545-1595°F), followed by slow furnace cooling to avoid cracking.
• Hardening: Heat to 1010-1065°C (1850-1950°F), followed by quenching in oil or air to achieve maximum hardness.
• Tempering: Heat to 150-200°C (300-390°F) for 1-2 hours to relieve internal stresses and improve toughness.