TP310H Seamless Stainless Steel Tube

UNS S31009 | 1.4845 | ASTM A213

TP310H Seamless Stainless Steel Tube (S31009 / 1.4845) is manufactured to ASTM A213 from stainless steel billet, cold-drawn to the required outside diameter and wall thickness. Supplied from our Wenzhou mill with EN 10204 3.1 mill test certificate, PMI and dimensional inspection on request.

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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 produced 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.

TP310H Key Features and Technical Advantages

Feature	Description
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.

TP310H 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

TP310H 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.

TP310H Common Industrial Applications

Industry	Typical 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

TP310H Quality Assurance and Production Process

Process Step	Description
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 About TP310H Seamless Stainless Steel Tubes

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.

Request a TP310H Tube Quotation

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.

Request a TP310H Tube Quotation