321 Stainless Steel Round Bar (UNS S32100)
321 Stainless Steel Round Bar (UNS S32100) is a titanium-stabilized austenitic stainless steel designed to provide excellent resistance to intergranular corrosion, especially after exposure to elevated temperatures. The addition of titanium prevents carbide precipitation during welding and high-temperature service, making 321 round bars ideal for applications involving prolonged exposure between 427°C to 816°C. This grade offers good corrosion resistance, excellent formability, and reliable mechanical strength.
Key Features
- UNS Number: S32100
- Titanium stabilized for enhanced resistance to intergranular corrosion
- Excellent performance at elevated temperatures
- Good oxidation and corrosion resistance
- Superior weldability without post-weld heat treatment
- Good toughness and ductility
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 321 |
| UNS | S32100 |
| EN | 1.4541 |
| DIN | X6CrNiTi18-10 |
| JIS | SUS 321 |
Sizes
- Diameter Range: 3 mm to 500 mm
- Length: 3 m, 6 m, or as per customer requirement
- Cut-to-length sizes available on request
321 Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C (max 0.70) |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
UNS S32100 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HB |
SS 321 Tube Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1399 – 1420°C |
| Thermal Conductivity | 16.3 W/m·K |
| Electrical Resistivity | 0.72 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of 321 Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Polished Round Bar
- Centerless Ground Round Bar
Applications
- Aircraft exhaust manifolds and engine parts
- Heat exchangers and thermal processing equipment
- Chemical processing components
- Expansion joints and bellows
- Furnace parts and high-temperature fasteners
- Oil & gas refinery equipment
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