The F347/H ASTM SR (Short Radius) Elbow is designed for applications requiring a change in direction within a constrained space. Manufactured from stainless steel grades F347 and F347H, this elbow is known for its excellent resistance to intergranular corrosion, especially after welding or exposure to high temperatures. The addition of niobium in the alloy stabilizes it against carbide precipitation. The short radius design, with a radius equal to the nominal pipe diameter, makes it suitable for tight installations where space is limited. This elbow is commonly used in the chemical, petrochemical, and power generation industries, providing reliable performance under high-temperature conditions. The higher carbon content in F347H enhances its strength and stability at elevated temperatures.
| Property | Details |
|---|---|
| Standard | ASTM A182 |
| Material | Stainless Steel F347/H |
| Chemical Composition | Chromium (Cr): 17-19%<br>Nickel (Ni): 9-13%<br>Carbon (C): Max 0.10% (F347), 0.04-0.10% (F347H)<br>Niobium (Nb): 10 x C Min<br>Manganese (Mn): Max 2%<br>Silicon (Si): Max 1%<br>Phosphorus (P): Max 0.045%<br>Sulfur (S): Max 0.03% |
| Mechanical Properties | Tensile Strength: Min 515 MPa (75,000 psi)<br>Yield Strength: Min 205 MPa (30,000 psi)<br>Elongation: Min 40% |
| Type | Short Radius (SR) Elbow |
| Radius | 1.0 times the pipe diameter |
| Angle | 45°, 90°, 180° |
| Connection Type | Butt-weld |
| Size Range | Custom sizes available, typically from 1/2″ to 24″ |
| Pressure Rating | Class 150, Class 300, Class 600, Class 900, Class 1500, Class 2500 |
| Applications | Chemical processing, petrochemical industries, power generation |
| Manufacturing | Machined, heat-treated |
| Advantages | Compact design, high-temperature strength, resistance to intergranular corrosion |
| Ordering Information | Specify pipe sizes, angle, pressure class, and connection type |
| Suppliers | McMaster-Carr, Grainger, Penn Stainless Products |
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