TP304H has a minimum carbon concentration of 0.04%, compared to TP304's maximum of 0.08%. The greater minimum carbon improves creep-rupture strength at high temperatures while retaining overall corrosion resistance in watery conditions.
ASTM A213 TP304H Stainless Steel Seamless Tube
TP304H stainless steel seamless tube is an austenitic chromium-nickel tube identified by UNS S30409 and the European designationW.Nr. 1.4948 / EN X6CrNi18-10. We at Zhejiang Xintongda Special Steel Manufacturing Co., Ltd provide quality ASTM A213 TP304H Stainless Steel Seamless Tube it also referenced as SA-213 TP304H or 304H austenitic stainless steel. This grade belongs to the 18-8 austenitic family with a controlled carbon range of 0.04–0.10% C, the key differentiator that improves creep-rupture strength versus standard TP304. Full composition stands at 18–20% Cr, 8&–10.5% Ni, max 2% Mn, and max 1% Si
Seamless tubes are manufactured under ASTM A213 by cold rolling, cold drawing, annealing, pickling, and straightening. The operating range spans -196 °C to 800 °C, making this grade the standard choice for boiler superheaters, reheaters, and high-temperature process lines.
We manufacture UNS S30409 seamless tube with a 25,000-tonne annual capacity, with delivery in approximately 1 week from stock or 15–60 days for production orders.
Our TP304H stainless steel seamless tubes are manufactured to strict industry standards; please refer to the technical specifications below.
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Standard
ASTM A213
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OD Range
6 to 457 mm
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Thickness
1 to 65 mm
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Length
Up to 18 m
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How TP304H Stainless Steel Seamless Tube is Produced
We manufacture high-quality TP304H stainless steel seamless tubes by adhering to rigorous industrial procedures. Our process involves hot-extruding austenitic chromium-nickel ingots into hollows. We then finalise tube dimensions through cold drawing, rolling, or pilger processing to ensure compliance with technical standards.
Solution annealing at controlled temperatures restores the austenitic microstructure and sensitisation resistance. Pickling removes surface scale, and each tube is then straightened. Eddy-current testing and hydrostatic testing confirm dimensional and pressure integrity before cut-to-length and packaging. To know more about our manufacturing process, visit our page.
Key Features of TP304H Stainless Steel Seamless Tube
The following are key features of TP304H seamless tubes for high-temperature strength and long-term industrial durability:
- Elevated-Temperature Creep Strength: Controlled carbon content (0.04–0.10%) increases creep-rupture strength over normal TP304 at service temperatures between 550 and 750 °C, permitting thinner boiler superheater walls.
- Good Oxidation Resistance: Chromium-rich protective scale offers reliable oxidation resistance in continuous service up to 800°C and in intermittent service up to 870 °C, covering most utility boiler and industrial furnace operating cycles.
- Excellent Weldability: Fully weldable by all common fusion methods using matching filler. Post-weld solution annealing is not required for service within normal temperature limits, simplifying field and shop fabrication.
- Resistance to Carburisation: Provides acceptable resistance to carbon pickup in hydrogen and ethylene cracking environments where moderate service conditions apply, extending tube life in petrochemical convection-section service.
- Low-Temperature Toughness: The stable austenitic structure retains toughness from cryogenic temperatures through to high-temperature service, making the grade suitable for dual-service applications or plants with wide ambient operating ranges.
- Cost-Effective High-Temperature Solution: Offers excellent high-temperature performance at a lower cost than nickel-base superalloys, making it the standard specification for boiler superheater and reheater tube bundles in utility and industrial power plants.
ASTM A213 TP304H Stainless Steel Seamless Tube Equivalent Materials
The table below lists common international equivalents to support a consistent supply for engineering projects worldwide.
| UNS | DIN/EN | GB | JIS | ISO | GOST |
| S30409 | 1.4948 / X6CrNi18-10 | 06Cr19Ni10 / 304H | SUS 304H TB | X5CrNi18-10 | 08X18H10 |
100% Certified Testing & Documentation
Every shipment of TP304H stainless steel seamless tubes leaves our facility with comprehensive documentation verifying chemistry, mechanical performance, corrosion behaviour, and dimensional accuracy. Xintongda maintains full traceability from raw material heat to finished tube, supporting code-compliant and third-party-inspected project supply.
- Raw Materials Certificate
- 100% PMI (Positive Material Identification)
- Heat Treatment Charts
- Third-Party Inspection Report (TPI / TUV / BV / SGS)
- Surface roughness and dimensional measurement
- Manufacturer Test Certificate (Impact, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain Size, ET, UT, HT)
- Laboratory Test Certificate from Government-Approved Lab
TP304H Stainless Steel Seamless Tube Industrial Applications
The UNS S30409 tube serves high-temperature industries where sustained creep performance and oxidation resistance determine material selection. Key application sectors include the following:
Boiler Superheater Tubes
These tubes are essential for the superheater sections of utility boilers, reliably handling intense metal temperatures up to 650°C during continuous power generation.
Power Plant Steam Piping
Used in main steam lines for coal and biomass plants, this grade provides the oxidation resistance necessary for modern subcritical plant designs.
Petrochemical and Refinery Service
In ethylene plants and reformer piping, TP304H provides carburisation resistance. It significantly reduces maintenance needs for any system facing cyclic high-temperature service every day.
Heat Exchanger Tubes
Ideal for shell-and-tube exchangers in chemical plants, these tubes maintain a stable structure that resists sensitisation during prolonged elevated-temperature industrial operations.
Process Piping in HT Service
These seamless tubes are used in chemical process lines operating up to 750°C, providing consistent material properties for long-running continuous facilities.
Pulp and Paper Recovery Boilers
Recovery boiler floor tubes and screen sections use this grade for reliable creep resistance and stability in high-temperature combustion areas.
Frequently Asked Questions
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What is the difference between TP304 and TP304H?
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What is the maximum service temperature of TP304H?TP304H is suitable for continuous service up to 800 °C in oxidising atmospheres. Design stresses per ASME Section II apply up to approximately 815 °C, depending on the applicable code case.
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Is TP304H prone to sensitisation?TP304H can sensitise during extended exposure at 425–815°C, forming chromium carbides at grain boundaries. For applications at risk, TP304L, TP321H, or TP347H are recommended alternatives depending on service conditions.
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What standards cover TP304H Seamless Tubes?TP304H Tubes are produced to ASTM A213 (boiler and heat exchanger). ASME SA-213 and SA-312 are the corresponding code specifications for pressure service.
- How TP304H Stainless Steel Seamless Tube is Produced
- Key Features of TP304H Stainless Steel Seamless Tube
- ASTM A213 TP304H Stainless Steel Seamless Tube Equivalent Materials
- 100% Certified Testing & Documentation
- TP304H Stainless Steel Seamless Tube Industrial Applications
- Questions related to SS 304 Tube