ASTM A213 TP321H Stainless Steel Seamless Tubes (UNS S32109)
ASTM A213 TP321H Stainless Steel Tubes (UNS S32109) are high-temperature austenitic stainless steel tubes designed for elevated-temperature service in boilers, superheaters, heat exchangers, and refinery applications. The “H” grade signifies high-carbon content, which enhances creep strength, oxidation resistance, and structural stability at temperatures above 500°C. Manufactured using precision cold-drawn or hot-finished techniques, TP321H tubes offer outstanding resistance to intergranular corrosion due to the titanium stabilization that prevents carbide precipitation. These tubes are widely preferred in industries requiring long-term high-temperature performance and resistance to thermal fatigue.
Key Features
- Excellent high-temperature strength and creep resistance
- Titanium stabilized for superior intergranular corrosion protection
- High resistance to oxidation and scaling at elevated temperatures
- Suitable for continuous high-temperature service
- Smooth surface finish and dimensional accuracy
- Superior mechanical stability in thermal cycling environments
- Ideal for boiler, superheater, and heat-exchanger applications
Equivalent Grades
| Standard | Grade |
|---|---|
| EN | X6CrNiTi18-10 |
| UNS | S32109 |
| WNR | 1.4878 |
Available Sizes
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Outside Diameter: 6 mm to 101.6 mm
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Wall Thickness: 0.5 mm to 12.7 mm
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Length: Up to 12 meters
ASTM A213 TP321H Chemical Composition
| Element | % |
|---|---|
| Carbon (C) | 0.04–0.10 |
| Chromium (Cr) | 17.0–19.0 |
| Nickel (Ni) | 9.0–12.0 |
| Titanium (Ti) | ≥5 × C |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤0.75 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.030 |
| Nitrogen (N) | ≤0.10 |
ASTM A213 TP321H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥515 MPa |
| Yield Strength | ≥205 MPa |
| Elongation | ≥35% |
| Hardness | ≤192 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1398–1454°C |
| Thermal Conductivity | 16.3 W/m-K |
| Electrical Resistivity | 0.72 µΩ-m |
| Modulus of Elasticity | 193 GPa |
Types of ASTM A213 TP321H Tubes
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Seamless Boiler Tubes
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Seamless Superheater Tubes
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Heat Exchanger Tubes
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Instrumentation Tubes
Applications
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Boilers & Superheaters
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Petrochemical Refining
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Heat Exchangers
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Thermal Power Plants
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Chemical Processing
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High-Temperature Piping Systems
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