Zeron Fastners
SS 347 Springs (Compression, Tension, Torsion) - Niobium Stabilized
SS 347 Springs are dynamic mechanical fasteners designed to store energy, absorb shock, or maintain a force between mating surfaces. This material is a premium Niobium-stabilized austenitic stainless steel, critically important for applications where the springs are exposed to high operating temperatures, typically between 425°C and 816°C. This stabilization, achieved through the addition of Niobium, prevents intergranular corrosion post-fabrication or welding, which is vital for the long-term integrity and reliability of the spring under continuous dynamic stress. Zeron Fasteners manufactures SS 347 springs—including compression, tension, and torsion types—to precise load and rate specifications for critical use in power generation, process control valves, and aerospace mechanisms.
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SS 347 Springs 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 Springs Mechanical Properties
| Property | Value (Typical, Annealed) |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength (0.2% Offset) | 205 MPa |
| Elongation | 35% |
| Modulus of Elasticity | 193 GPa |
| Shear Modulus | 77 GPa |