ASTM A213 T91 Alloy Steel Tubes (UNS K91560)
ASTM A213 T91 Seamless Ferritic Alloy Steel Tubes are high-performance tubing solutions designed for high-temperature and high-pressure environments, making them ideal for superheaters, reheaters, heat exchangers, and power generation systems. Manufactured using advanced hot-finished or cold-drawn processes, ASTM A213 T91 (UNS K91560) tubes offer remarkable creep strength, oxidation resistance, and long-term thermal stability, making them one of the most popular grades in the ferritic alloy steel family.
Key Features
- High creep & tensile strength at elevated temperatures
- Excellent oxidation & corrosion resistance
- Superior thermal stability for long-term service
- Low thermal expansion & high hardness
- Ideal for superheaters, boilers & power plant operations
- Tight dimensional tolerances & seamless finish
- High weldability with proper PWHT
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | K91560 |
| ASME | SA213 T91 |
| EN | X10CrMoVNb9-1 |
| DIN | 1.4903 |
| BS | 91 Grade Alloy Steel |
Available Sizes
| Category | Size Range |
|---|---|
| Outside Diameter | 6 mm – 120 mm |
| Wall Thickness | 0.5 mm – 12 mm |
| Length | Up to 12 meters (custom lengths available) |
ASTM A213 T91 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.08 – 0.12 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.010 |
| Silicon (Si) | 0.20 – 0.50 |
| Chromium (Cr) | 8.0 – 9.5 |
| Molybdenum (Mo) | 0.85 – 1.05 |
| Vanadium (V) | 0.18 – 0.25 |
| Niobium (Nb) | 0.06 – 0.10 |
| Nitrogen (N) | 0.030 – 0.070 |
| Iron (Fe) | Balance |
ASTM A213 T91 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (min) | 585 MPa |
| Yield Strength (min) | 415 MPa |
| Elongation | 20% |
| Hardness (HBW) | ≤ 250 |
| Impact Strength | High impact toughness in elevated temperatures |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.78 g/cm³ |
| Melting Point | ~1425–1510°C |
| Thermal Conductivity | 23.0 W/m·K |
| Coefficient of Expansion | 12.0 × 10⁻⁶ /°C |
| Modulus of Elasticity | 215 GPa |
Types of T91 Tubes
- Hot Finished Seamless Tubes
- Cold Drawn Seamless Tubes
- Boiler Tubes
- Superheater Tubes
- Heat Exchanger Tubes
- U-Bend Tubes
- High-Pressure Tubes
- Custom Fabricated Tubes
Applications
- Power Plants
- Superheaters & Reheaters
- High-Pressure Boilers
- Heat Exchangers
- Petrochemical Industry
- Refineries
- Thermal & Nuclear Plants
- Steam Generators
- Chemical Processing Plants
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