Zeron Fastners
SS 347 Screws
SS 347 Screws, also known as UNS S34700, are premium mechanical fasteners made from a stabilized austenitic stainless steel alloy. What sets this material apart is the addition of Niobium (Columbium), which effectively prevents chromium carbide precipitation during welding or high-temperature exposure (425°C to 816°C). This feature makes our screws, supplied by Zeron Fasteners, highly suitable for critical applications in chemical processing, aerospace, and oil/gas industries where resistance to intergranular corrosion is paramount. They offer excellent strength, good ductility, and outstanding corrosion resistance in oxidizing environments.
Related Products
SS 347 Screws Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 |
| Manganese (Mn) | 2.00 |
| Phosphorus (P) | 0.045 |
| Sulfur (S) | 0.030 |
| Silicon (Si) | 1.00 |
| 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%. All maximum values use the implied 'less than or equal to' sign.
SS 347 Screws Mechanical Properties
| Property | Value (Typical) |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength (0.2% Offset) | 205 MPa |
| Elongation | 35% |
| Hardness (Brinell, HB) | 217 max |
| Density | 8.03 g/cm³ |