Zeron Fastners
SS 347 Elbows (90° / 45° Long & Short Radius)
SS 347 Elbows are essential piping components used to change the direction of fluid flow, typically by **90°** or **45°**. These components are manufactured primarily through the forging process and subsequent specialized forming (like mandrelling) and machining. The use of SS 347 material, an austenitic stainless steel stabilized with **Niobium (Columbium)**, is critical for piping systems that operate at elevated temperatures (**425°C to 816°C**). The stabilization prevents the precipitation of chromium carbides at the grain boundaries during welding, thereby ensuring the elbow retains full resistance to **intergranular corrosion**. Zeron Fasteners supplies these high-quality elbows in various forms—including Long Radius (LR) and Short Radius (SR)—guaranteeing the structural integrity and longevity of critical lines in petrochemical, power generation, and chemical processing plants.
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SS 347 Elbows Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 13.00 |
| Niobium (Nb) + Tantalum (Ta) | 10 x C – 1.00 |
Note: The combined Niobium and Tantalum content must be ten times the Carbon content minimum, up to a maximum of 1.00%.
SS 347 Elbows Mechanical Properties
| Property | Value (Typical, ASTM A403 WP347) |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength (0.2% Offset) | 205 MPa |
| Elongation | 30% |
| Hardness (Brinell, HB) | 217 max |
| Design Temperature | Up to 870°C |