ASTM A312 TP310Cb Austenitic Stainless Steel Pipes (UNS S31040)
ASTM A312 TP310Cb is a columbium-stabilized, high-temperature austenitic stainless steel pipe grade designed for superior oxidation resistance, creep strength, and durability. With its enhanced chromium-nickel composition and Cb (niobium) stabilization, TP310Cb performs exceptionally well in elevated-temperature environments, thermal cycling conditions, and corrosive atmospheres.
Key Features (Bullet Points)
- UNS S31040 grade with columbium (Nb) stabilization for enhanced creep resistance
- Excellent high-temperature strength up to 1150°C
- Superior oxidation & carburization resistance
- High corrosion resistance in acidic and sulfur-bearing environments
- Excellent mechanical stability under thermal cycling
- Good weldability and fabricability
- Suitable for applications requiring long-term structural integrity
- Available in seamless & welded forms
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | TP310Cb |
| UNS | S31040 |
| WNR | 1.4845 Modified (Approx.) |
| EN | X15CrNi25-21 Stabilized (Nearest Equivalent) |
Available Sizes
Outer Diameter (OD):
-
6 mm to 610 mm
Wall Thickness:
-
1.0 mm to 60 mm
Nominal Bore (NB):
-
1/8” NB to 24” NB
Lengths:
-
Up to 12 meters (custom lengths available)
ASTM A312 TP310Cb Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.50 max |
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 19.0 – 22.0 |
| Nitrogen (N) | 0.10 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Columbium/Niobium (Cb/Nb) | Stabilized (10x C min) |
| Iron (Fe) | Balance |
ASTM A312 TP310Cb Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | 35% min |
| Hardness | ≤ 95 HRB |
ASTM A312 TP310Cb Physical Properties
| Property | Value |
|---|---|
| Density | 8.00 g/cm³ |
| Melting Range | 1400 – 1450°C |
| Thermal Conductivity | 14.2 W/m·K (at 100°C) |
| Electrical Resistivity | 0.95 µΩ·m |
| Coefficient of Expansion | 15.6 µm/m°C (20–100°C) |
Types of ASTM A312 TP310Cb Pipes
- Seamless Pipes
- Welded Pipes
- EFW Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- Custom Fabricated Pipes
- Instrument & Heat-Exchanger Pipes
Applications
- High-temperature furnace equipment
- Petrochemical and refinery heat-processing units
- Thermal power plant superheaters & reheaters
- Waste incineration systems
- Steam boilers and pressure vessels
- Chemical processing equipment
- Heat exchangers & radiant tubes
- Pulp & paper industry
- Aerospace & gas turbine components
- Automotive exhaust and emission systems
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