Zeron Fastners
SS 321 Nuts
An SS 321 Nut is a vital threaded fastener component, designed to mate with bolts, screws, or stud bolts to secure components in a joint. These nuts are manufactured from Stainless Steel Grade 321, an austenitic alloy renowned for its Titanium stabilization. The presence of Titanium ties up carbon, which effectively prevents the precipitation of chromium carbides during exposure to high temperatures (the sensitization range, 425°C to 850°C). This stabilization ensures the nut retains its full corrosion resistance, even after being subjected to the heat cycles of welding or high-temperature service. Zeron Fasteners manufactures and supplies robust SS 321 Nuts (often meeting ASTM A194 Grade 8T) that are essential for high-heat, corrosive applications in the petrochemical, power generation, and aerospace industries, providing secure and reliable threaded connections.
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SS 321 Nuts 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 Nuts Mechanical Properties
| Property | Value (Typical) |
|---|---|
| Proof Load Strength | Varies by size |
| Hardness (HB) | 165 – 235 |
| Nut Style | Hex / Heavy Hex |
| Thread Compatibility | ASTM A193 B8T Studs |
| Recommended Service Temperature | 850°C |