Zeron Fastners
SS 347 Reducers (Concentric & Eccentric) - Pipe Fittings
SS 347 Reducers are pipe forgings used to transition between pipe sections of different diameters in a fluid transport system. They are categorized as **Concentric Reducers** (where the centerlines of the two ends remain aligned) and **Eccentric Reducers** (where the centerlines are offset, typically used to maintain a constant bottom or top elevation). These critical fittings are manufactured from **SS 347**, an austenitic stainless steel stabilized with Niobium (Columbium). This stabilization is essential as it prevents **intergranular corrosion** within the Heat Affected Zone (HAZ) of welds, which can occur when non-stabilized stainless steels are exposed to high service temperatures (**425°C to 816°C**). **Zeron Fasteners** supplies these robust reducers, ensuring leak-free, high-integrity piping joints for chemical, pharmaceutical, and power generation industries.
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SS 347 Reducers 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 Reducers 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 |
| Operating Temperature | Up to 870°C |