What is a Seamless Stainless Steel TP316 Pipe?
TP316 Seamless Stainless Steel Pipe is supplied for molybdenum-enhanced resistance to pitting in chloride service. 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.
Compared to TP304, TP316 contains 2–3% Molybdenum (Mo), significantly improving resistance to pitting corrosion, crevice corrosion, and chloride attack. It is widely recognized as the preferred material for marine, chemical processing, pharmaceutical, and high-purity industries.
Key Advantages of TP316 Stainless Steel Seamless Pipe
Excellent Chloride Corrosion Resistance
Suitable for seawater, coastal and high-salinity service where chloride content, temperature, oxygen level and crevice conditions are assessed against the selected grade.
Seamless Structure for Maximum Integrity
No longitudinal weld seam, which removes the weld-quality risk of welded pipe; the design pressure follows the applicable code and the allowable stress assigned to the grade.
Superior High-Temperature Performance
Molybdenum and higher nickel content give better high-temperature strength retention than 304/304L, subject to the design temperature and code allowable stress.
Full Traceability & Certification
Each pipe is marked with heat number and supplied with EN 10204 3.1 MTC.
Hygienic & Smooth Surface Finish
Non-porous and easy to clean, perfect for food, beverage, and medical systems.
Product Specifications and Data
To provide a comprehensive overview of this versatile material, here are the detailed technical specifications and performance data for 316 stainless steel.
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. 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 A312-25 / ASME SA312 Table 1, TP316 row ≤ heat-analysis acceptance limits. Confirm the values against the ordered edition and the MTC.
Typical Mechanical Properties
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% | ≤ 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 |
|---|---|---|---|---|---|
| 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.
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.
Main Applications of TP316 Seamless Stainless Steel Pipe
Offshore & Marine Engineering
Seawater pipelines, offshore platforms, desalination systems
Chemical & Petrochemical Industry
Acid, alkali, and chloride handling pipelines
Pharmaceutical & Biotechnology
Sterile and high-purity fluid systems
Energy & Power Plants
Heat exchangers, condensers, boiler tubing
Quality Assurance & Inspection
Inspection is carried out to the scope agreed on the purchase order. The items below are available and are applied as specified in that order:
Material Certification
EN 10204 3.1 Mill Test Certificate (MTC) as standard; EN 10204 3.2 on arrangement
Nondestructive Testing (NDT)
Ultrasonic Testing (UT), Eddy Current Testing (ET) or Hydrostatic Testing, as specified
Positive Material Identification (PMI)
Chemical verification on heat or lot samples before shipment
Mechanical & Corrosion Testing
Flattening, flaring, bending, and intergranular corrosion (IGC) tests
Third-Party Inspection Available
SGS, BV, TÜV, Lloyd’s Register (LR)
Frequently Asked Questions
What sizes are available for TP316 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 TP316 seamless pipe?
ASTM A312 / ASME SA312 is the governing specification for TP316 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 TP316 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.
