321H Stainless Steel Round Bar (UNS S32109)
321H Stainless Steel Round Bar (UNS S32109) is a high-carbon, titanium-stabilized austenitic stainless steel specifically designed for improved creep resistance and higher strength at elevated temperatures. Compared to standard 321, the higher carbon content in 321H enhances high-temperature mechanical properties while titanium stabilization prevents carbide precipitation. This makes 321H round bars highly suitable for high-temperature and pressure applications such as boilers, heat exchangers, and refinery equipment.
Key Features
- UNS Number: S32109
- Higher carbon content for improved creep and tensile strength
- Titanium stabilized to resist intergranular corrosion
- Excellent performance at elevated temperatures
- Good oxidation and corrosion resistance
- Suitable for high-pressure and high-temperature service
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 321H |
| UNS | S32109 |
| EN | 1.4878 |
| DIN | X6CrNiTi18-10 |
| JIS | SUS 321H |
Sizes
- Diameter Range: 6 mm to 500 mm
- Length: 3 m, 6 m, or as per customer requirement
- Custom and cut-to-length sizes available
321H Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| 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 S32109 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HB |
321H Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1400 – 1425°C |
| Thermal Conductivity | 16.0 W/m·K |
| Electrical Resistivity | 0.72 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of 321H Stainless Steel Round Bar
- Hot Rolled Round Bar
- Bright Round Bar
- Polished Round Bar
- Centerless Ground Round Bar
Applications
- High-temperature boilers and superheaters
- Heat exchangers and condensers
- Oil & gas refinery equipment
- Pressure vessels and piping systems
- Furnace components
- Power generation plants
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