The F347/H ASTM Stub End is a crucial fitting used in piping systems to facilitate the connection of pipes with different sizes or to connect pipes to flanges. Made from stainless steel grades F347 and F347H, these stub ends offer superior resistance to intergranular corrosion, particularly after welding, due to the niobium stabilization. The F347H grade, with its higher carbon content, provides enhanced strength and stability at elevated temperatures, making these stub ends suitable for high-temperature and high-pressure applications. These fittings are commonly used in industries such as chemical processing, petrochemical, and power generation, where durability and reliable performance are essential. The stub end’s design allows for easy assembly and disassembly, making it ideal for maintenance and inspection tasks.
| 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 | Stub End |
| 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 | Excellent corrosion resistance, high-temperature strength, easy assembly/disassembly |
| Ordering Information | Specify pipe sizes, pressure class, and connection type |
| Suppliers | McMaster-Carr, Grainger, Penn Stainless Products |
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