ASTM A694 GR. F65 is a high-strength carbon steel material widely used in the manufacturing of flanges, fittings, and other components for high-pressure pipeline systems. This grade is specifically engineered for severe environments, offering excellent strength, toughness, and weldability, making it a preferred choice in industries like oil and gas, petrochemical, and power generation.
ASME B16.5 ASTM A694 GR. F65 RTJ Weld Neck Flange
Chemical Composition
The chemical composition of ASTM A694 GR. F65 is carefully balanced to provide high strength and toughness while maintaining weldability. Below is the typical chemical composition for this material:
| Element | Content (%) |
| Carbon (C) | ≤ 0.26 |
| Manganese (Mn) | 1.10–1.40 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.15–0.35 |
| Vanadium (V), Columbium (Cb), or Titanium (Ti) | ≤ 0.05 each (optional for grain refinement) |
This composition ensures a good balance between strength, ductility, and machinability.
Mechanical Properties
ASTM A694 GR. F65 is renowned for its superior mechanical properties, which make it suitable for high-pressure and high-temperature applications. Below are the key mechanical property requirements:
| Property | Value |
| Yield Strength (min) | 450 MPa (65 ksi) |
| Tensile Strength (min) | 535 MPa (78 ksi) |
| Elongation (min) | 20% (based on 50mm gauge length) |
| Hardness (max) | 22 HRC (equivalent to approximately 235 HB) |
These mechanical properties ensure the material’s capability to handle high-stress environments without compromising performance.
Applications
ASTM A694 GR. F65 is primarily used in:
High-Pressure Flanges: Commonly employed in oil and gas pipelines, ensuring secure and leak-free connections.
Pipeline Fittings: Ideal for elbows, tees, reducers, and other fittings in high-pressure systems.
Valves and Wellhead Equipment: Frequently used in valves, manifolds, and other critical components for upstream and midstream operations.
Advantages
High Strength: The material’s high yield and tensile strength make it suitable for applications in extreme pressure conditions.
Low-Temperature Toughness: ASTM A694 GR. F65 performs well in low-temperature environments, making it suitable for Arctic operations.
Weldability: It exhibits excellent weldability, enabling easy fabrication and installation in complex systems.
Versatility: Its compatibility with various pressure ratings (e.g., 150#, 300#, 2500#) and pipe dimensions enhances its adaptability across projects.
At Haihao Group, we specialize in manufacturing flanges, fittings, and custom components using ASTM A694 GR. F65, adhering to global standards like ASME B16.5 and MSS-SP-44. Our rigorous quality control processes, including material testing and certification, ensure that each product meets the highest standards of safety and reliability.
For more information or to discuss your specific requirements, please contact us today.Email:sales@haihaogroup.com
