17.4PH Stainless Steel Round Bar

17-4PH stainless steel round bars offer a unique combination of high strength, corrosion resistance, and toughness, making them suitable for a wide range of demanding applications in aerospace, marine, and industrial sectors.

With proper heat treatment, they can achieve excellent mechanical properties, ensuring reliable performance in harsh environments.

Chemical Composition (in%):

Physical Properties:

• Density: 7.8 g/cm³
• Melting Point: Approximately 1400°C (2550°F)
• Specific Heat Capacity: 460 J/kg·K (0-100°C)
• Thermal Conductivity: 16.2 W/m·K (100°C)

Mechanical Properties:

• Tensile Strength: 1035 MPa (150 ksi)
• Yield Strength (0.2% Offset): 760 MPa (110 ksi)
• Elongation at Break: 16%
• Hardness, Rockwell C: 36 HRC (annealed), 44 HRC (precipitation hardened)

Features:

• Precipitation-hardening stainless steel with excellent combination of high strength, good corrosion resistance, and toughness.
• Offers a wide range of mechanical properties depending on heat treatment conditions.
• Provides good resistance to corrosion in a variety of environments, including mild atmospheres, freshwater, and some corrosive chemicals.
• Exhibits high strength and hardness levels suitable for applications requiring robust performance, such as aerospace components, shafts, and gears.
• Can be machined in the annealed condition, but achieves maximum properties after precipitation hardening treatment.
• Offers good weldability using standard techniques and can be easily heat treated to achieve desired mechanical properties.

Heat Treatment:

• Annealing: Heat to 1010-1095°C (1850-2000°F), followed by air cooling or rapid cooling to below 16°C (60°F) to avoid precipitation of chromium carbides.
• Precipitation Hardening: Heat to 482-593°C (900-1100°F) for 1-4 hours, followed by air cooling or rapid cooling to room temperature.
• Aging: Optional aging treatment at lower temperatures (e.g., 21-232°C or 70-450°F) to further improve mechanical properties.