Zeron Fastners
SS 321 Stud Bolts
An SS 321 Stud Bolt is a straight rod, typically threaded on both ends or fully threaded, used primarily to connect flanged joints in piping systems, pressure vessels, and valves. These critical fasteners are manufactured from Stainless Steel Grade 321, an austenitic alloy that is stabilized by the addition of Titanium. This element prevents the harmful precipitation of chromium carbides, ensuring the stud maintains its intergranular corrosion resistance even when exposed to high temperatures (known as the sensitization range, 425°C to 850°C) during manufacturing or service. Zeron Fasteners manufactures and supplies robust SS 321 Stud Bolts (often conforming to ASTM A193 Grade B8T) that are essential for securing equipment in demanding environments like power generation, refineries, and boiler assemblies where resistance to both heat and corrosion is required for joint integrity.
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SS 321 Stud Bolts 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 Stud Bolts Mechanical Properties
| Property | Value (Typical) |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength (0.2% Offset) | 205 MPa |
| Elongation in 50mm | 35 % |
| Hardness (HRC) | 22 max |
| Corrosion Service Temperature | 850°C |