ASTM A312 TP310HCb Austenitic Stainless Steel Pipe
ASTM A312 TP310HCb (UNS S31009 Modified with Cb/Nb) is a high-temperature, niobium-stabilized austenitic stainless steel pipe engineered for extreme heat service. The addition of Columbium (Cb/Nb) significantly enhances creep resistance, reduces sensitization, and strengthens the material for long-term exposure to elevated temperatures. With excellent oxidation and carburization resistance up to 1150°C, 310HCb is ideal for thermal processing, reformer units, petrochemical heating, and furnace applications.
This grade delivers superior structural stability, exceptional durability, and reliable performance under heavy thermal cycling.
Key Features
- Columbium (Cb/Nb) stabilized for enhanced creep & high-temperature strength
- Excellent oxidation resistance up to ~1150°C
- Superior thermal stability for prolonged high-heat exposure
- Outstanding resistance to carburizing & sulfidizing atmospheres
- Minimized carbide precipitation due to Nb stabilization
- High tensile & yield strength at elevated temperatures
- Excellent weldability and structural integrity
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S31009 (Nb-stabilized modification) |
| EN / DIN | Similar to 1.4845 (modified) |
| JIS | SUS310H (Modified with Nb) |
| BS | 310H (Cb Stabilized Variation) |
Available Sizes
- Outside Diameter: 6 mm – 610 mm
- Wall Thickness: 1.2 mm – 60 mm
- Schedules: SCH 5 – XXS
- Length: Up to 12 meters
ASTM A312 TP310HCb Chemical Composition
| Element | % |
|---|---|
| C | 0.04 – 0.10 |
| Mn | ≤ 2.00 |
| Si | ≤ 1.50 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
| Cr | 24.0 – 26.0 |
| Ni | 19.0 – 22.0 |
| Cb/Nb | 0.20 – 1.00 |
| N | ≤ 0.10 |
| Fe | Balance |
ASTM A312 TP310HCb Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 192 HB |
ASTM A312 TP310HCb Physical Properties
| Property | Value |
|---|---|
| Density | 7.9 g/cm³ |
| Melting Range | 1400–1450°C |
| Thermal Conductivity | 14.2 W/m·K |
| Electrical Resistivity | 0.78 µΩ·m |
| Elastic Modulus | 200 GPa |
| Thermal Expansion | 15.4 µm/m°C |
Types of TP310HCb Pipes
- Seamless Pipes
- Welded Pipes
- ERW Pipes
- EFW Pipes
- Hot Finished Pipes
- Cold Drawn Pipes
- Polished Pipes (180/240/320/600 Grit)
- Fabricated Pipes
Applications
- Reformer Tubes & Petrochemical Heaters
- Furnace Components & Burner Parts
- Heat Treatment Equipment
- Boiler Superheaters
- Kilns, Industrial Ovens & Incinerators
- High-Temperature Chemical Reactors
- Power Plant Heater Tubing
- Carburizing & Annealing Chambers
Reviews
There are no reviews yet.