What Is a Seamless Stainless Steel TP314 Tube?
TP314 Seamless Stainless Steel Tube is supplied for high-silicon oxidation resistance for high-temperature service. The size range shown (OD 6–257 mm; WT 0.5–35 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. TP314 (UNS S31400) is a high-silicon heat-resistant austenitic grade and is not listed in the ASTM A312/A213/A269 pipe-and-tube product specifications; supply is therefore quoted against the specification, edition and acceptance criteria agreed on the purchase order. Chemistry, mechanical properties, heat treatment, dimensional tolerance, NDT and certification are reported against that ordered standard and the material heat; typical values on this page are for reference and are not guaranteed acceptance limits.
Key Features and Advantages
TP314 Stainless Steel Seamless tube offer a unique combination of benefits that make them invaluable in demanding high-temperature industries:
Exceptional High-Temperature Oxidation Resistance
The high silicon content provides superior resistance to oxidation and scaling in high-temperature air, surpassing the performance of many other stainless steels.
Excellent Creep-Rupture Strength
It maintains high tensile and creep-rupture strength at elevated temperatures, ensuring long-term structural stability under high-temperature loads.
Resistance to Carburization
The alloy is highly resistant to carburization, which is crucial for applications in high-temperature furnaces and reducing atmospheres.
High Pressure and Temperature Tolerance
The seamless construction and robust material allow the tube to safely handle high internal pressures and extreme temperatures.
Good Weldability
The alloy can be readily welded using standard methods, and its balanced composition helps prevent hot cracking.
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 TP314 tube.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| S31400 | 314 | 1.4841 | Not confirmed | Not confirmed | Not confirmed |
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. Approximate or unconfirmed correspondences retain their qualification. See the grade designation index.
Chemical Composition
The composition of Stainless Steel 314 is carefully balanced to achieve its superior high-temperature oxidation resistance and strength.
| C | Mn | P | S | Si | Cr | Ni |
|---|---|---|---|---|---|---|
| ≤0.25 | ≤2.00 | ≤0.045 | ≤0.030 | 1.50－3.00 | 23.00－26.00 | 19.00－22.00 |
Data source: Heat-analysis acceptance limits shown above are the values commonly specified for TP314 (S31400) high-silicon austenitic steel. Because TP314 is not listed in ASTM A312/A213/A269, the governing specification and edition are those agreed on the purchase order; always confirm the limits against that ordered edition and the mill test certificate (MTC).
Stainless Steel 314 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 520 MPa | ≥ 205 MPa | ≥ 40% | ≤ 217 HBW |
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 | 1390 – 1420 °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.
ASTM A1016/A1016M Tube Size Tolerance Chart
Size Tolerance Chart (mm)
| 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 |
Tolerance basis: permitted variations per the governing specification stated on this page and the applicable general-requirements standard (ASTM A1016 / ASME SA1016) for the ordered product form; the wall-thickness and length variations in this section follow the same basis.
| 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 |
Length Tolerance
- 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 Applications
The combination of high-temperature strength and exceptional oxidation resistance of Seamless TP314 tube makes them a preferred choice for:
Heat Treating Industry
Used in radiant tubes, muffles, retorts, and other furnace parts.
Power Generation
In boiler components, reheater tubes, and steam generator tubing.
Chemical and Petrochemical Processing
For furnace tubes, burner components, and other high-temperature applications.
Cement Industry
For kiln components and other high-temperature process equipment.
Frequently Asked Questions
What sizes are available for TP314 seamless tube?
Which specification governs TP314 seamless tube?
What inspection documents are provided?
Technical review: page data reviewed by the Xinzhe technical desk on 2026-09-27. Chemistry acceptance limits follow the specification and edition agreed on the purchase order (TP314/S31400 is not listed in ASTM A312/A213/A269); 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 size (OD and wall or schedule), 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 pipe form, see the TP314 seamless pipe. To compare other grades and size combinations, browse the Stainless Steel Seamless Pipe category. Minimum order quantity and lead time are confirmed on enquiry against the ordered grade, size and quantity.
