What Is a Seamless Stainless Steel TP316L Tube?
TP316L Seamless Stainless Steel Tube is supplied for low-carbon weldability and molybdenum-enhanced chloride resistance. 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.
Manufactured from a solid billet via seamless extrusion, these tubes deliver a uniform metallurgical structure with no longitudinal weld seam, giving consistent mechanical performance along the entire length.
The defining characteristic of Grade 316L is its low carbon content (≤ 0.035% per ASTM A213/A312), which reduces the risk of sensitization—the precipitation of chromium carbides at grain boundaries during welding—compared with standard 316. Where the welding heat history is controlled and the service environment is moderate, this generally limits heat-affected zone (HAZ) sensitization to a level close to that of the base metal and can reduce the need for post-weld solution annealing; whether annealing is required remains a function of the project specification, wall thickness and service conditions.
The ultra-low carbon composition minimizes the risk of intergranular corrosion (IGC), commonly referred to as “weld decay,” making TP316L the preferred choice for welded systems.
With 2.0% – 3.0% molybdenum (Mo), TP316L offers excellent resistance to chloride-induced corrosion, outperforming TP304/304L in marine and chemical environments.
The absence of longitudinal weld seams supports uniform wall thickness and consistent fatigue performance; the allowable stress used for design is the value assigned to the specific grade, product form and specification in the applicable design code, and is not determined by the seamless construction alone.
High ductility allows for bending, flaring, and complex fabrication, while maintaining structural integrity and corrosion resistance.
Smooth, non-porous internal surfaces meet sanitary and high-purity requirements, compliant with ASME BPE standards for pharmaceutical and food-grade systems.
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 TP316L Tube.
- The key difference in 316L’s composition is its significantly lower carbon content (≤ 0.035% per ASTM A213/A312), while retaining the essential molybdenum for superior corrosion resistance.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| S31603 | 316L | 1.4404 | X2CrNiMo17-12-2 | SUS316L | 022Cr17Ni12Mo2 / 00Cr17Ni14Mo2 |
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
| C | Si | Mn | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|
| ≤0.035 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.00–18.00 | 10.00–14.00 | 2.00–3.00 |
Data source: ASTM A213-25 / ASME SA213 Table 1, TP316L row ≤ heat-analysis acceptance limits. Confirm the values against the ordered edition and the MTC.
- Grade TP316L offers a good balance of strength and ductility, with a slightly lower tensile and yield strength compared to 316 due to its lower carbon content, but still robust for most demanding applications.
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 485 MPa | ≥ 170 MPa | ≥ 35% | ≤ 192 HBW / 200 HV / 90 HRB |
- These physical properties are largely similar to 316, indicating consistent thermal and electrical behavior.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
|---|---|---|---|---|---|
| 8.0 g/cm³ | 1370-1400 °C | 16.5 μm/m·°C (20-100°C) | 16.3 W/m·K (100°C) | 193 GPa | 0.74 × 10⁻⁶ Ω·m (20°C) |
- 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
- TP316L seamless stainless steel tubes are widely used in industries requiring high corrosion resistance, weld integrity, and cleanliness:
Heat Exchangers & Condensers
Used in coastal power plants and refineries where chloride exposure is critical
Pharmaceutical & Biotechnology
CIP/SIP systems and WFI (Water for Injection) pipelines
Offshore Oil & Gas
Hydraulic and instrumentation tubing in marine environments
Precision Instrumentation
Control lines for chemical injection and analytical systems
Quality Assurance, Testing & Certification
TP316L seamless tubes are supplied with full traceability and the inspection scope agreed on the purchase order:
Certification
- EN 10204 3.1 Material Test Certificates (MTC) as standard; 3.2 by arrangement
Non-Destructive Testing (NDT)
- Ultrasonic Testing (UT) or Eddy Current Testing (ET), as specified on the purchase order
- Hydrostatic Pressure Testing
Metallurgical Verification
- PMI (Positive Material Identification)
- Intergranular Corrosion (IGC) per ASTM A262 Practice E
- Grain size analysis
Mechanical Testing
- Tensile, hardness, flattening, and flaring tests
Third-Party Inspection
Available on request from SGS, BV, TUV, ABS, or equivalent authorities
Frequently Asked Questions
What sizes are available for TP316L 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 TP316L seamless tube?
ASTM A269; ASTM A213 / ASME SA213 when ordered for heat-exchanger or boiler service is the governing specification for TP316L 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 TP316L 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.
