What Is a Seamless Stainless Steel TP316 tube?
Seamless Stainless Steel TP316 tube (UNS S31600) – Molybdenum-Alloyed Corrosion-Resistant Solution
TP316 Seamless Stainless Steel Tube is supplied for molybdenum-enhanced resistance to pitting in chloride 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. The governing specification must be stated on the purchase order: ASTM A269; ASTM A213 / ASME SA213 when ordered for heat-exchanger or boiler service. 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.
Unlike welded tubes, seamless construction has no longitudinal weld seam, providing uniform mechanical properties and enhanced reliability under high pressure, corrosive media, and critical service conditions.
The defining feature of Grade 316 stainless steel is its 2.0% – 3.0% molybdenum (Mo) content, which significantly improves resistance to pitting and crevice corrosion, especially in chloride-rich environments such as seawater, chemical processing, and offshore applications.
Key Features and Industrial Advantages
Superior Pitting and Crevice Corrosion Resistance
The addition of molybdenum provides enhanced protection against localized corrosion, making TP316 far more resistant than TP304 in aggressive environments.
High-Pressure Capability (Seamless Structure)
Seamless construction removes the longitudinal weld seam and its associated weld-quality risk, which in the ASME Boiler and Pressure Vessel Code (BPVC) is recognised through the joint-efficiency factor applied to the design of welded pipe. The allowable stress used for design is the value assigned to the grade, product form and specification in the applicable code; it is not enhanced simply by choosing a seamless product.
Excellent Fabrication Performance
TP316 offers outstanding weldability, formability, and machinability, suitable for complex piping systems using standard TIG/MIG processes.
Hygienic Surface Quality
Smooth internal surfaces reduce contamination risks, making it ideal for food processing and pharmaceutical industries requiring high cleanliness standards.
Cryogenic Toughness
Maintains excellent ductility and impact resistance at sub-zero temperatures, suitable for low-temperature and LNG applications.
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 TP316 tube.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| S31600 | 316 | 1.4401 | X5CrNiMo17-12-2 | SUS316 | 06Cr17Ni12Mo2 / 0Cr17Ni12Mo2 |
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 316 is carefully balanced to achieve its superior corrosion resistance and high strength.
| Cr | Ni | Mo | P | S | Mn | Si | C |
|---|---|---|---|---|---|---|---|
| 16.00 – 18.00 | 10.00 – 14.00 | 2.00 – 3.00 | ≤ 0.045 | ≤ 0.030 | ≤ 2.00 | ≤ 1.00 | ≤ 0.08 |
Data source: ASTM A213-25 / ASME SA213 Table 1, TP316 row ≤ heat-analysis acceptance limits. Confirm the values against the ordered edition and the MTC.
Stainless Steel 316 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 515 MPa | ≥ 205 MPa | ≥ 35% | ≤ 192 HBW / 200 HV / 90 HRB |
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 |
|---|---|---|---|---|---|
| 8.0 g/cm³ | 1375 – 1400 °C approx | 16.5 μm/m·°C (20-100°C) | 16.3 W/m·K (20°C) | 193 GPa | 0.74 × 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 Industrial Applications
Due to its superior corrosion resistance and mechanical properties, TP316 seamless stainless steel tubing is widely used in:
Chemical & Petrochemical Industry
Handling aggressive media such as acetic acid, sulfuric acid, and chlorides
Marine & Offshore Engineering
Seawater systems, desalination plants, offshore platforms, and ship piping
Food & Beverage Industry
Hygienic processing lines, breweries, and dairy systems
Pharmaceutical Industry
Sterile pipelines requiring high-purity internal surfaces
Pulp & Paper Industry
Bleaching systems and digesters exposed to corrosive chemicals
Frequently Asked Questions
What sizes are available for TP316 seamless tube?
The overall range is OD 6–257 mm; WT 0.5–35 mm. Requirements outside this range are reviewed against mill capability on request.
Which specification governs TP316 seamless tube?
ASTM A269; ASTM A213 / ASME SA213 when ordered for heat-exchanger or boiler service is the governing specification for TP316 seamless tube. 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 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 TP316 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.
