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TP310S is a premium austenitic stainless steel engineered for exceptional high-temperature performance and oxidation resistance, making it a cornerstone material in extreme thermal environments. As the low-carbon variant of the TP310 series, TP310S features a reduced carbon content (≤0.08%) to eliminate intergranular corrosion risks during welding, while maintaining the robust chromium-nickel backbone (24-26% Cr, 19-22% Ni) that defines its thermal stability.
The alloy’s microstructure forms a dense oxide layer at elevated temperatures, protecting against scaling and corrosion up to 1150°C in continuous service and 1200°C in intermittent use. This makes TP310S ideal for applications where conventional stainless steels fail due to thermal degradation. The addition of small amounts of molybdenum (≤0.75%) further enhances its resistance to chloride-induced pitting, while the austenitic structure provides inherent ductility for complex forming and welding without post-treatment.
Manufactured via seamless extrusion, TP310S pipes exhibit uniform grain structure and precise dimensional control, eliminating weld lines that could compromise integrity in high-temperature systems. Post-production solution annealing refines the microstructure, while optional surface treatments (pickling, polishing) optimize corrosion resistance and aesthetics. The alloy’s unique balance of thermal strength, oxidation resistance, and weldability positions it as a go-to solution in industries demanding reliability under extreme heat.
ASTM A312: Seamless/welded 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 |
|---|---|---|---|---|---|---|---|---|
| TP310S | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 24.0-26.0 | 19.0-22.0 | ≤0.75 |
| TP310 | ≤0.25 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.50 | 24.0-26.0 | 19.0-22.0 | - |
| TP310H | 0.04-0.10 | ≤2.00 | ≤0.045 | ≤0.03 | ≤0.75 | 24.0-26.0 | 19.0-22.0 | - |
| Property | TP310S | TP310 | 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 |
Maximum Service Temperature:
Continuous use: 1150°C
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)
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)
Process Flow:
Vacuum induction melting (VIM) for chemical purity.
Hot-rolling of ingots into billets.
Cold-drawing/extrusion for precise dimensions.
Solution annealing at 1040-1120°C to refine grain structure.
Pickling to remove scale and ensure surface cleanliness.
Surface Treatments:
Pickled & Annealed (standard): Removes oxidation, ideal for high-temperature resistance.
Bright Annealed: Maintains surface luster in non-corrosive heat applications.
Polished: Ra ≤0.8μm for aesthetic or hygienic requirements.
Testing Regime:
100% Eddy Current Testing (ET) for surface defects.
Hydrostatic Pressure Testing (1.5x 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 operating at 1000°C+.
Recuperators & Heat Exchangers: Recovering waste heat in thermal processing lines, withstanding constant exposure to flue gases.
Fluidized Bed Furnaces: Coal combustors and wind boxes in power generation facilities.
Catalytic Cracking Units: Tube hangers and reactor internals in petroleum refining, resisting high-temperature cracking gases.
Flares & Exhaust Systems: Constructing flare tips and exhaust ducts exposed to 1000°C+ flue gases containing SO₂ and CO₂.
Heat Recovery Systems: Transferring heat in heavy oil processing and visbreaking units.
Coal Gasification Plants: Internals of gasifiers and pulverized coal burners in integrated gasification combined cycle (IGCC) systems.
Steam Superheaters: Tubes in high-pressure boilers operating at 540°C+ in thermal power plants.
Waste-to-Energy Facilities: Incinerator pipes and ash handling systems in waste treatment plants.
Steel Melting & Casting: Smelter equipment, continuous casting guides, and ladle components in steel mills.
Ore Reduction Furnaces: Retorts and ducts in iron ore reduction processes using direct reduced iron (DRI) methods.
Jet Engine Components: Exhaust nozzles and afterburner liners in aircraft engines (temporary exposure to 1200°C).
Nuclear Reactor Internals: Structural supports in high-temperature zones of nuclear reactors.
A: TP310S’s lower carbon content (≤0.08%) prevents intergranular corrosion during welding, while TP310 (≤0.25% C) is more susceptible to carbide precipitation. Both offer similar oxidation resistance, but TP310S is preferred for welded high-temperature components.
A: TP310S excels in dry, high-temperature conditions but is not optimized for aqueous corrosion. For wet environments, consider 316L or duplex steels. However, it resists mild acids and alkalis at room temperature.
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, while TP310S prioritizes weldability for applications like furnace components.
A: Yes, TP310S 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 are available within 2-4 weeks. Custom dimensions or special finishes (e.g., bright annealing) require 6-8 weeks, including heat treatment and testing. Rush orders with expedited certification can be arranged for urgent projects.
