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TP310 is a high-performance austenitic stainless steel engineered for exceptional resistance to high-temperature oxidation and creep, making it a cornerstone material in extreme thermal environments. The alloy’s unique composition—24-26% chromium and 19-22% nickel—forms a dense oxide layer that protects against scaling and corrosion at temperatures up to 1200°C, while maintaining mechanical strength. This makes TP310 ideal for applications where conventional stainless steels fail due to thermal degradation.
Three primary variants exist to address specific needs:
TP310 (S31000): Standard grade with ≤0.25% carbon, suitable for general high-temperature service.
TP310S (S31008): Low-carbon version (≤0.08% C) to prevent intergranular corrosion during welding.
TP310H (S31009): High-carbon variant (0.04-0.10% C) optimized for creep resistance at elevated temperatures.
Manufactured via seamless extrusion, TP310 pipes exhibit uniform grain structure and minimal dimensional variation, ensuring reliability in critical systems. Post-production annealing refines the microstructure, while optional surface treatments (pickling, polishing) enhance corrosion resistance and aesthetics. The alloy’s austenitic structure provides inherent ductility, enabling complex forming and welding without heat treatment—key advantages in industrial fabrication.
ASTM A312: Seamless austenitic stainless steel pipes for high-pressure applications.
ASTM A213: Boiler, superheater, and heat-exchanger tubes.
EN 10216-5: European standard for seamless steel tubes in pressure systems.
GOST 9940/9941: Russian standards for stainless steel pipes.
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| TP310 | ≤0.25 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.50 | 24.0-26.0 | 19.0-22.0 | ≤0.75 |
| TP310S | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 24.0-26.0 | 19.0-22.0 | ≤0.75 |
| TP310H | 0.04-0.10 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 24.0-26.0 | 19.0-22.0 | ≤0.75 |
| Property | TP310 | TP310S | TP310H |
|---|---|---|---|
| Tensile Strength | ≥515 MPa | ≥515 MPa | ≥485 MPa |
| Yield Strength | ≥205 MPa | ≥205 MPa | ≥170 MPa |
| Elongation | ≥35% | ≥35% | ≥35% |
| Hardness (HRB) | ≤90 | ≤90 | ≤90 |
| Creep Rupture Strength (1000°C, 1000h) | - | - | ≥60 MPa |
Outer Diameter (OD): 6 mm to 1016 mm (0.24" to 40")
Wall Thickness: 1 mm to 65 mm (0.04" to 2.56")
Length: Customizable up to 12 meters (standard: 6 meters)
Maximum Service Temperature:
Continuous use: 1150°C (TP310S/310)
Intermittent use: 1200°C
Coefficient of Thermal Expansion: 14.5×10⁻⁶/°C (20-1000°C)
Thermal Conductivity: 16 W/m·K (at 100°C)
Surface Treatments:
Pickled & Annealed (standard): Removes scale, ideal for high-temperature oxidation resistance.
Bright Annealed: Maintains surface luster in non-corrosive heat applications.
Polished: Ra ≤0.8μm for aesthetic or hygienic requirements.
Quality Control:
100% Eddy Current Testing (ET) for surface defects.
Hydrostatic Pressure Testing (1.5×design pressure).
Grain size analysis and intergranular corrosion (IGC) testing per ASTM A262.
Furnace Components: Burner grids, retorts, muffles, and walking beams in annealing and carburizing furnaces.
Recuperators & Heat Exchangers: Recovering waste heat in thermal processing lines, withstanding 1000°C+ temperatures.
Fluidized Bed Furnaces: Coal combustors and wind boxes in power generation.
Catalytic Cracking Units: Tube hangers and reactor internals in petroleum refining.
Flares & Exhaust Systems: Resisting oxidation in high-temperature flue gases (SO₂, CO₂).
Heat Recovery Systems: Transferring heat in heavy oil processing.
Coal Gasification Plants: Internals of gasifiers and pulverized coal burners.
Steam Superheaters: Tubes in high-pressure boilers operating at 540°C+
Waste-to-Energy Facilities: Incinerator pipes and ash handling systems.
Steel Melting & Casting: Smelter equipment, continuous casting guides, and ladle components.
Ore Reduction Furnaces: Retorts and ducts in iron and steel production.
Jet Engine Components: Exhaust nozzles and afterburner liners (temporary exposure to 1200°C).
Nuclear Reactor Internals: Structural supports in high-temperature reactor zones.
A: TP310’s higher Cr/Ni content (24-26% Cr, 19-22% Ni vs. 304’s 18% Cr, 8% Ni) provides superior oxidation resistance above 800°C. 304 may scale or lose strength, while TP310 maintains integrity up to 1150°C.
A: TP310 excels in dry, high-temperature conditions but is not optimized for aqueous corrosion. For wet environments, consider 316L or duplex steels. However, TP310S resists intergranular corrosion in mildly acidic solutions.
A: Use low-heat-input TIG welding with 310L filler wire. Preheat to 150-200°C for thick sections, and avoid continuous exposure to 425-815°C (sensitization range). Post-weld annealing is optional but improves ductility.
A: TP310H’s higher carbon (0.04-0.10%) stabilizes the austenitic structure, enhancing creep resistance at 650-1000°C. This makes it ideal for long-term high-temperature service, unlike TP310S, which prioritizes weldability.
A: Yes, TP310 maintains ductility at -196°C, though its primary advantage is high-temperature performance. For cryogenics, 304/316 may be more cost-effective unless thermal cycling is required.
A: Standard sizes (310/310S) are available within 2-4 weeks. TP310H or special dimensions require 6-8 weeks, including heat treatment and testing. Rush orders with expedited certification can be arranged.
