UNS S31009|1.4845|TP310H Seamless Stainless Steel Tube

TP310H (UNS S31009) Seamless Stainless Steel Tube Manufacturer & Supplier | Xinzhe China
Xinzhe is a specialized manufacturer and global exporter of TP310H (UNS S31009) seamless stainless steel tubes, based in Wenzhou, China. Engineered for high-temperature service, our TP310H tubing is the industry standard for environments requiring high creep strength and oxidation resistance.
As a leading 310H stainless steel seamless pipe supplier, we provide precision-drawn tubes that comply with ASTM A213, A312, and EN 10216-5 standards. The high carbon content in TP310H ensures superior mechanical properties and structural stability at sustained elevated temperatures, outperforming lower-carbon alternatives in heavy-duty thermal processing.
Technical Profile: TP310H (UNS S31009 / 1.4845)
TP310H is a high-chromium, high-nickel austenitic alloy designed for service in temperatures up to 1100°C (2012°F). Its optimized chemistry provides an excellent balance of ductility and strength.
Technical Attribute Manufacturing Range & Specifications
Outer Diameter (OD) 6.35mm – 406mm
Wall Thickness (WT) 0.5mm – 30mm (SCH 5S to SCH XXS)
Standard Compliance ASTM A213 (Boiler/Exchanger), ASTM A312 (Pipe)
Testing Protocols Hydrostatic, Eddy Current, Grain Size Analysis, Creep Testing
Surface Finish Solution Annealed & Pickled (AP), Bright Annealed (BA)
Performance Advantages of Xinzhe TP310H Tubing
• Enhanced Creep Strength: The controlled carbon range (0.04–0.10%) provides significantly higher creep rupture strength compared to TP310S.
• Oxidation & Carburization Resistance: High Chromium (25%) and Nickel (20%) content forms a protective oxide layer that resists scaling in moderately carburizing atmospheres.
• Metallurgical Stability: Our advanced solution annealing process prevents sigma phase embrittlement, ensuring long-term ductility in high-heat cycles.
• Wenzhou Manufacturing Excellence: Our facility utilizes state-of-the-art cold-rolling and cold-drawing equipment to achieve tight di

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What Is a Seamless Stainless Steel TP310H Tube?

TP310H (UNS S31009) is the high-carbon variant of the 25Cr-20Ni austenitic stainless steel family. The controlled carbon range of 0.04–0.10% gives significantly better creep and stress-rupture strength than standard TP310, while the high chromium and nickel contents still deliver the outstanding oxidation and carburization resistance the grade is known for.

Seamless Stainless Steel TP310H Tube is a high-temperature, corrosion-resistant tube crafted from a single, solid billet of a high-chromium and high-nickel austenitic stainless steel. It is manufactured without a weld joint, ensuring superior structural integrity and reliability, especially under high-stress and high-temperature conditions. The”310H”designation refers to a specific grade that is a high-carbon version of Stainless Steel 310. This higher carbon content (0.04-0.10%) provides enhanced creep and stress-rupture properties at elevated temperatures, making it a preferred choice for applications where long-term high-temperature strength and stability are critical. This makes it a top choice for demanding applications in industrial furnaces, power generation, and heat treatment.

Key Features and Technical Advantages

Excellent High-Temperature Strength

The higher carbon content of 0.04–0.10% provides superior creep and stress-rupture strength compared with the low-carbon TP310S, allowing higher design temperatures.

Outstanding High-Temperature Oxidation Resistance

The 25% chromium and 20% nickel contents form a stable protective oxide that resists scaling and spalling in continuous and cyclic high-temperature service.

Resistance to Carburization

The alloy resists carburization in carbon-rich atmospheres, a decisive property for pyrolysis and reforming furnace tubing.

High Pressure and Temperature Tolerance

The seamless wall removes the weld efficiency penalty, permitting higher allowable pressure at elevated temperature.

Good Weldability

TP310H can be welded by standard austenitic procedures; the matched filler maintains strength and oxidation resistance across the joint.

Product Specifications and Data

To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Seamless Stainless Steel TP310H Tube.

The composition of Stainless Steel 310H is carefully balanced to achieve its superior high-temperature strength and oxidation resistance.

C	Si	Mn	P	S	Cr	Ni	Fe
0.04–0.10	≤1.00	≤2.00	≤0.045	≤0.030	24.00–26.00	19.00–22.00	Bal

Key Point: Thehigh Cr-Ni balance provides excellent resistance to oxidation, while the higher carbon content enhances high-temperature strength and creep resistance.

Stainless Steel 310H is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.

Tensile Strength	Yield Strength	Elongation	Hardness
≥ 515 MPa	≥ 205 MPa	≥ 35%	≤ 192 HBW / 200 HV / 90 HRB

These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.

Density	Melting Point	Thermal Expansion	Thermal Conductivity	Modulus of Elasticity	Electrical Resistivity
7.9 g/cm³	1400 – 1450 °c approx	16.5 um/m°C (20-100°C)	14.2 W/mK (20°C)	200 GPa	0.78 x 10⁻⁶ Ω·m (20°C)

Specified Outside Diameter (OD) (Inches)	Permissible Variations in OD (± Inches)
1⁄2 to 1	±0.005
Over 1 to 1-1⁄2	±0.008
Over 1-1⁄2 to 2	±0.010
Over 2 to 2-1⁄2	±0.012
Over 2-1⁄2 to 3-1⁄2	±0.014
Over 3-1⁄2 to 5	±0.020

Specified Outside Diameter (OD) (Inches)	Specified Wall Thickness (WT) (Inches)	Permissible Variation (± Inches)
1⁄2 to 1 (Inclusive)	0.025 to 0.065(Inclusive)	±0.010
	Over 0.065to 0.134 (Inclusive)	±0.012
Over 1 to 1-1⁄2 (Inclusive)	0.025 to 0.065 (Inclusive)	±0.010
	Over 0.065 to 0.134 (Inclusive)	±0.012
Over 1-1⁄2 to 2 (Inclusive)	0.025 to 0.049 (Inclusive)	±0.011
	Over 0.049 to 0.083 (Inclusive)	±0.012
	Over 0.083 to 0.148 (Inclusive)	±0.014
Over 2 to 2-1⁄2 (Inclusive)	0.032 to 0.065 (Inclusive)	±0.013
	Over 0.065 to 0.109 (Inclusive)	±0.015
	Over 0.109 to 0.165 (Inclusive)	±0.017
Over 2-1⁄2 to 3-1⁄2 (Inclusive)	0.032 to 0.165 (Inclusive)	±0.020
	Over 0.165 to 0.220 (Inclusive)	±0.025
Over 3-1⁄2 to 5 (Inclusive)	0.083 to 0.165 (Inclusive)	±0.025
	Over 0.165 to 0.220 (Inclusive)	±0.030

Dimensional Standards and Tolerances

TP310H seamless tubes are supplied to the dimensional tolerances of ASTM A213 / A1016 unless a tighter project specification applies.

For Specific Cut Lengths, the standard tolerance is +1⁄8 in. [3 mm], -0 in. [0 mm].

Important Note: The values presented here are based on the dimensional tolerance tables in ASTM A1016/A1016M (General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes), contains other essential requirements like straightness and details for tubes with ODs outside of this range. Always consult the latest official standard for design and procurement.

Common Industrial Applications

Power Generation

Superheater and reheater tubes
Boiler pressure parts
Steam generator tubing

Heat Treating Industry

Radiant tubes and muffles
Retorts and furnace internals
High-temperature fixtures

Chemical and Petrochemical Processing

Furnace tubes and burner components
High-temperature reactor internals
Reformer and cracker tubing

Cement Industry

Kiln components
High-temperature process equipment
Calciner and preheater parts

Quality Assurance and Manufacturing Process

Certification

All TP310H tubes are supplied to ASTM A213 / ASME SA213 and ASTM A312 / ASME SA312 with EN 10204 3.1 mill test certificates. Third-party inspection (SGS, BV, TUV, Lloyd's), PMI reports and full heat-number traceability can be provided on request.

Non-Destructive Testing (NDT)

Hydrostatic or eddy-current testing is performed on 100% of tubes. Ultrasonic testing (UT) and dye-penetrant inspection (PT) are available for critical service, with records retained for each production lot.

Material Verification

Positive Material Identification (PMI) and spectrometric analysis confirm that the chemical composition matches the ordered grade. Intergranular corrosion (IGC) testing to ASTM A262 Practice E is available for austenitic and nickel-alloy tubes.

Mechanical Testing

Tensile, yield, elongation and hardness tests are carried out per heat. Flattening, flaring and reverse-bend tests verify ductility, while creep-rupture data can be supplied for high-temperature grades.

Dimensional Inspection

Outside diameter, wall thickness, ovality and straightness are measured against ASTM A1016 / A1016M or EN 10216-5 tolerances. Length, square-cut ends and end-finish conditions are verified before packing.

TP310H vs TP310 / TP310S – Technical Comparison

TP310H, TP310 and TP310S share the same 25Cr-20Ni base but differ in carbon content, which controls whether creep strength or weldability dominates the selection.

Carbon Content

TP310H: 0.04–0.10% C — a controlled high-carbon range for creep strength
TP310: 0.25% C maximum — the original high-carbon grade
TP310S: 0.08% C maximum — the low-carbon, weldable variant

Creep and Stress-Rupture Strength

TP310H is designed for the high-temperature regime where creep governs the wall thickness. Its controlled carbon range delivers better creep and stress-rupture strength than TP310S at the same temperature, allowing higher design conditions or longer life.

Corrosion and Fabrication Behaviour

Lower carbon in TP310S reduces carbide precipitation at grain boundaries, which preserves intergranular corrosion resistance in the heat-affected zone and makes the grade easier to weld without post-weld heat treatment. TP310H trades some of that weldability for elevated-temperature strength.

Selection Guide

Choose TP310H for superheater and reheater tubing and other creep-limited high-temperature duty
Choose TP310S for welded structures and general high-temperature service where fabrication simplicity matters more than creep strength
Choose TP310 only where the original specification calls for it

Frequently Asked Questions

What is TP310H seamless tube?

TP310H (UNS S31009) is the high-carbon variant of the 25Cr-20Ni austenitic stainless steel family, with carbon controlled in the 0.04–0.10% range. The higher carbon delivers improved creep and stress-rupture strength at elevated temperature.

What is the difference between TP310, TP310S and TP310H?

The three grades share the same 25Cr-20Ni base and differ in carbon content. TP310H specifies 0.04–0.10% C for creep strength, TP310S is limited to 0.08% C for weldability and intergranular corrosion resistance, and TP310 permits up to 0.25% C.

What standard covers TP310H seamless tube?

TP310H is normally supplied to ASTM A213 / ASME SA213 for superheater, reheater and heat-exchanger tubing, and to ASTM A312 / ASME SA312 where pipe dimensions are required.

What is TP310H tube used for?

TP310H serves in superheater and reheater tubing, boiler pressure parts, radiant tubes and furnace internals, and high-temperature petrochemical process equipment where creep strength at temperature governs the design.

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Send your Seamless Stainless Steel TP310H Tube enquiry with grade, application, size (OD and wall thickness or schedule), quantity, length, end finish and inspection requirements. Our technical team will confirm availability, testing scope and lead time.

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