Seamless Stainless Steel TP310 Pipe (UNS S31000 / 1.4845) High-Temperature Heat-Resistant Austenitic Stainless Steel Pipe
What is TP310 Seamless Stainless Steel Pipe?
TP310 Seamless Stainless Steel Pipe is supplied for high chromium-nickel content for oxidation resistance at elevated temperature. 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.
Manufactured using a seamless process (hot piercing + cold finishing), the pipe provides:
- Uniform metallurgical structure
- No longitudinal weld seam
- Superior high-temperature strength
- Excellent resistance to thermal cycling
The TP310 grade is characterized by:
- Chromium (Cr): ~25%
- Nickel (Ni): ~20%
This Cr-Ni combination forms a stable protective oxide layer, allowing continuous service at temperatures up to:
1150°C (2100°F)
Compared with TP304 and TP316, TP310 offers significantly better oxidation resistance and creep strength, making it the preferred material for high-heat industrial applications.
Key Features & Technical Advantages
Excellent High-Temperature Oxidation Resistance
- Superior resistance to scaling and oxidation
- Stable performance under continuous and cyclic heating
- Ideal for furnace and thermal equipment
High Creep Strength & Mechanical Stability
- Maintains strength at elevated temperatures
- Resists deformation under long-term stress
- Suitable for structural high-temperature components
Good Resistance to Carburizing & Nitriding
- Performs well in carbon-rich and nitrogen-rich atmospheres
- Widely used in petrochemical and furnace environments
High Pressure Integrity (Seamless Structure)
- No longitudinal weld seam
- Uniform wall thickness
- Meets ASTM A312 / ASME SA312 standards
Stable Low-Temperature Performance
- Retains toughness at low temperatures
- Low magnetic permeability
- Suitable for specialized cryogenic conditions
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for 310 stainless steel.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| S31000 | 310 | 1.4845 | X8CrNi25-21 | SUS 310S | 06Cr25Ni20 |
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 310 is carefully balanced to achieve its superior high-temperature oxidation resistance and strength.
| 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, TP310 row ≤ heat-analysis acceptance limits. Confirm the values against the ordered edition and the MTC.
Typical Mechanical Properties
Stainless Steel 310 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.
Dimensional Standards & Tolerances
TP310 seamless pipes are produced according to international standards:
Standards Covered
- ASTM A312 / ASME SA312
- JIS G3463
- GB/T 14976
Typical Tolerances
- OD tolerance: ±0.2 mm to ±0.5%
- Wall thickness: ±10% to ±20%
- Length: per standard or customer requirement
Ensures high precision and engineering compatibility
Industrial Applications
TP310 seamless stainless steel pipes are widely used in high-temperature and high-stress environments:
Industrial Furnaces & Heat Treatment
- Furnace linings
- Burner tubes
- Heat shields
- Muffle tubes
Power Generation
- Furnace linings
- Burner tubes
- Heat shields
- Muffle tubes
Power Generation
- Boiler components
- Superheaters
- Coal gasification systems
Petrochemical Industry
- FCC units
- Thermal cracking systems
- Reformers
Heat Exchangers
- High-temperature tube bundles
- Chemical processing systems
Cryogenic & Special Applications
- Low-temperature equipment
- Non-magnetic structural components
Quality Assurance & Manufacturing Process
Every TP310 seamless pipe undergoes strict quality control:
Manufacturing Process
- High-quality billet selection
- Rotary hot piercing
- Precision cold drawing/rolling
- Solution annealing heat treatment
Inspection & Testing
Material Verification
- PMI (Positive Material Identification), when specified on the purchase order
Non-Destructive Testing (NDT)
- Ultrasonic Testing (UT)
- Eddy Current Testing (ET)
- Hydrostatic Testing
Mechanical Testing
- Tensile test
- Flattening test
- Flare test
- Hardness test
Certification
- EN 10204 3.1 Material Test Certificates (MTC) as standard; 3.2 by arrangement
Frequently Asked Questions
What sizes are available for TP310 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 TP310 seamless pipe?
ASTM A312 / ASME SA312 is the governing specification for TP310 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 TP310 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.
