What Is a Seamless Stainless Steel TP310S Pipe?
TP310S Seamless Stainless Steel Pipe is supplied for low-carbon heat resistance with improved weldability. The size range shown (OD 6–1016 mm; WT 0.5–65 mm) is the overall capability across this product family, not a per-grade commitment. Confirm the specific OD × WT × length combination for the ordered grade in the quotation. The governing specification must be stated on the purchase order: ASTM A312 / ASME SA312. Chemistry, mechanical properties, heat treatment, dimensional tolerance, NDT and certification must be reported against the ordered standard and material heat; do not treat typical values as guaranteed acceptance limits.
The”310S”designation signifies a low-carbon version of the TP310S grade. While TP310S is a superb high-temperature material, its carbon content can lead to”sensitization”(carbide precipitation) in the weld zone, which can compromise corrosion resistance. By lowering the carbon content, 310S effectively prevents this issue, making it a highly weldable material that retains its full corrosion resistance after fabrication. It retains the same excellent resistance to oxidation and scaling as the standard TP310S grade.
Key Features and Advantages
Seamless TP310S Pipes offer a unique combination of benefits that make them invaluable in the most demanding industries:
Excellent Weldability
The low carbon content makes it highly resistant to sensitization and intergranular corrosion after welding. This is its primary advantage over standard TP310S, simplifying fabrication and ensuring the material’s integrity.
Extreme High-Temperature Resistance
Like the standard 310 grade, it provides exceptional resistance to oxidation and scaling. It can be used continuously at temperatures up to 1150°C (2100°F).
High Pressure Tolerance
The seamless construction has no longitudinal weld seam; allowable internal pressure is calculated from the governing design code, the grade and the actual wall thickness rather than being inferred from the seamless form alone.
Excellent Corrosion Resistance
It offers superior corrosion resistance compared to many other stainless steel grades, performing well in both high-temperature and aggressive corrosive environments.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for stainless steel seamless TP310S pipe.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| S31008 | 310S | 1.4845 | X8CrNi25-21 | SUS310S | 06Cr25Ni20 / 0Cr25Ni20 |
Grade correspondence does not make ASTM, ASME, EN, JIS and GB delivery requirements interchangeable. Confirm chemistry, heat treatment, mechanical properties, dimensions, testing and certification against the purchase specification. See the grade designation index.
Chemical Composition
The composition of Stainless Steel 310S is carefully balanced to achieve its superior high-temperature stability and corrosion resistance.
| Cr | Ni | Mn | Si | P | S | Fe | C |
|---|---|---|---|---|---|---|---|
| 24.00 – 26.00 | 19.00 – 22.00 | ≤ 2.00 | ≤ 1.00 | ≤ 0.045 | ≤ 0.030 | Bal | ≤ 0.08 |
Data source: ASTM A312-25 / ASME SA312 Table 1, TP310S row ≤ heat-analysis acceptance limits. Confirm the values against the ordered edition and the MTC.
Typical Mechanical Properties
Stainless Steel 310S 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% | ≤ 217 HBW |
Note: Typical values for reference only — not acceptance limits. Mechanical properties are reported on the MTC against the ordered standard, product form, condition and test temperature.
Typical Physical Properties
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 μm/m·°C (20-100°C) | 14.2 W/m·K (20°C) | 200 GPa | 0.78 × 10⁻⁶ Ω·m (20°C) |
Note: Typical values for reference only — not acceptance limits. Physical and mechanical properties are reported on the MTC against the ordered standard, product form and condition.
Size Tolerance Chart (mm)
| NPS Designator (Inches) | Permissible Variations in Outside Diameter (Inches) |
| 1⁄8 to 1 1⁄2, inclusive | Over: 1⁄64 in. (0.015 in.) |
| Under: 1⁄32 in. (0.031 in.) | |
| Over 1 1⁄2 to 4, inclusive | Over: 1⁄32 in. (0.031 in.) |
| Under: 1⁄32 in. (0.031 in.) | |
| Over 4 to 8, inclusive | Over: 1⁄16 in. (0.062 in.) |
| Under: 1⁄32 in. (0.031 in.) | |
| Over 8 to 18, inclusive | Over: 3⁄32 in. (0.093 in.) |
| Under: 1⁄32 in. (0.031 in.) | |
| Over 18 to 26, inclusive | Over: 1⁄8 in. (0.125 in.) |
| Under: 1⁄32 in. (0.031 in.) | |
| Over 26 to 34, inclusive | Over: 5⁄32 in. (0.156 in.) |
| Under: 1⁄32 in. (0.031 in.) | |
| Over 34 to 48, inclusive | Over: 3⁄16 in. (0.187 in.) |
| Under: 1⁄32 in. (0.031 in.) |
Tolerance basis: permitted variations per the governing specification stated on this page and the applicable general-requirements standard (ASTM A999 / ASME SA999) for the ordered product form; the wall-thickness and length variations in this section follow the same basis.
The wall thickness tolerances are defined by the nominal wall thickness (t) and the outside diameter (D).
1. Minimum Wall Thickness
The minimum wall thickness at any point on the pipe shall not be more than {12.5%} under the nominal (specified) wall thickness.
2. Maximum Wall Thickness (Percentage Over Nominal)
The maximum allowable wall thickness variation depends on the size and the t/D ratio (ratio of nominal wall thickness to ordered outside diameter):
| NPS Designator (Inches) | t/D Ratio | Permissible Variation (Over Nominal WT) |
| 1/8 to 2, inclusive | All ratios | +20.0% |
| 3 to 18, inclusive | t/D ≤ 5% | +22.5% |
| 3 to 18, inclusive | t/D >5% | +15.0% |
| 20 and larger (Seamless) | t/D ≤ 5% | +22.5% |
| 20 and larger (Seamless) | t/D >5% | +15.0% |
| 20 and larger (Welded) | All ratios | +17.5% |
For pipe ordered to a Specific Cut Length, the standard tolerance is +1⁄8 in. [3.2 mm], -0 in. [0 mm].
Pipe is typically supplied in Single Random Lengths (17 to 24 ft) or Double Random Lengths (38 to 40 ft), unless otherwise specified.
Disclaimer: These tolerances are based on ASTM A999/A999M general dimensional requirements commonly referenced by ASTM A312 and ASTM A790. The full and most current specification document must always be consulted for official design and procurement purposes.
Common Industrial Applications
The unique combination of extreme heat resistance and superior weldability makes 310S stainless steel seamless pipes a preferred choice for:
Furnace Parts
Used for furnace linings, burners, and heat shields in industrial furnaces and kilns, where extensive welding and high temperatures are present.
Chemical Processing
In systems handling hot, corrosive chemicals and gases, especially when post-weld heat treatment is not practical.
Thermal Processing Equipment
Components for equipment in the heat treatment and metallurgical industries.
Cryogenic Applications
Its low magnetic permeability and excellent toughness at cryogenic temperatures also make it suitable for some cold-temperature applications.
Frequently Asked Questions
What sizes are available for TP310S seamless pipe?
The overall range is OD 6–1016 mm; WT 0.5–65 mm. Requirements outside this range are reviewed against mill capability on request.
Which specification governs TP310S seamless pipe?
ASTM A312 / ASME SA312 is the governing specification for TP310S seamless pipe. The edition in force at order time is stated on the quotation and purchase order; chemistry, mechanical properties, heat treatment, dimensions and testing are reported against the ordered standard and material heat.
What inspection documents are provided?
Each order is documented with a mill test certificate stating heat chemistry and mechanical test results. EN 10204 3.1 certification, hydrostatic testing, eddy-current or ultrasonic inspection and PMI are performed when specified in the purchase order.
Technical review: page data reviewed by the Xinzhe technical desk on 2026-09-27. Chemistry acceptance limits are compiled from the governing ASTM/ASME specification stated on this page; mechanical and physical values are typical reference data and are not acceptance guarantees. Values must be confirmed against the standard edition in force at order time and the material test certificate.
Ready to Request a Quotation?
Send the NPS and schedule (or actual OD and wall), quantity, length, end finish and the inspection items you need as acceptance criteria — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.
For the same grade in tube form, see the TP310S seamless tube. To compare other grades and size combinations, browse the Stainless Steel Seamless Tube category. Minimum order quantity and lead time are confirmed on enquiry against the ordered grade, size and quantity.
