Zeron Fastners
SS 321 Screws
SS 321 Screws are versatile threaded fasteners used to secure components, ranging from machinery parts to structural assemblies. This category includes high-precision types like Socket Head Cap Screws, Machine Screws, and Set Screws. They are manufactured from Stainless Steel Grade 321, an austenitic alloy stabilized with Titanium. This critical element prevents the chromium from combining with carbon during exposure to elevated temperatures (425°C to 850°C), thereby eliminating the risk of intergranular corrosion after manufacturing or welding. Zeron Fasteners manufactures and supplies robust SS 321 Screws specifically designed for applications in aerospace, exhaust manifolds, heat exchangers, and any industrial environment where the fastener must maintain strength and corrosion resistance while operating under thermal stress.
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SS 321 Screws Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 |
| Manganese (Mn) | 2.00 |
| Silicon (Si) | 1.00 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | 5 x C – 0.70 |
| Phosphorus (P) | 0.045 |
| Sulfur (S) | 0.030 |
Note: The Titanium content is five times the Carbon content minimum, up to a maximum of 0.70%.
SS 321 Screws Mechanical Properties
| Property | Value (Typical) |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength (0.2% Offset) | 205 MPa |
| Elongation in 50mm | 35 % |
| Hardness (HB) | 217 max |
| High Service Temperature | 850°C |