Zeron Fastners
SS 347 Flanges (Weld Neck, Slip-On, Blind)
SS 347 Flanges are ring-shaped pipe forgings used to connect pipes, valves, pumps, and other equipment to form a piping system. Flange connections are made by bolting two flanges together with a gasket in between. Flanges are available in several common types, including **Weld Neck** (for high-integrity, high-pressure butt-welded connections), **Slip-On** (easy alignment for lower pressure), and **Blind** (to seal off a pipeline end). The use of **SS 347 material**, an austenitic stainless steel stabilized with **Niobium**, is vital for systems operating at **elevated temperatures (up to 870°C)**. The stabilization prevents the formation of chromium carbides during welding, thereby ensuring the flange retains its full resistance to **intergranular corrosion**. **Zeron Fasteners** manufactures these flanges to strict ASME and ASTM standards, guaranteeing mechanical reliability and corrosion protection in critical applications like nuclear power and chemical processing.
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SS 347 Flanges 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 Flanges Mechanical Properties
| Property | Value (Typical, ASTM A182 F347) |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength (0.2% Offset) | 205 MPa |
| Elongation | 30% |
| Hardness (Brinell, HB) | 217 max |
| Pressure Rating | Class 150 to Class 2500 |