Meets Cleanliness and Corrosion Resistance Requirements for Pharmaceutical Industry, Bio-fermentation, and High-Chloride Water Treatment Systems
| Element | Content (%) | Role in Desalination Applications |
|---|---|---|
| Cr | 16.0–18.0 | Forms passive Cr₂O₃ film resisting seawater oxidation, repair rate 0.3 nm/h. |
| Mo | 2.0–3.0 | Enhances chloride pitting resistance, prevents crevice corrosion in seawater pipelines. |
| Ni | 10.0–14.0 | Stabilizes austenitic structure, improves toughness and stress corrosion resistance in marine environments. |
Physical: Density 7.98 g/cm³, Melting Point 1325–1370℃, Thermal Conductivity 15 W/(m·K) suitable for seawater heat exchange.
Mechanical: Yield strength ≥205 MPa, Elongation ≥40%, able to withstand bending stresses during subsea installation.
Outer Diameter: 10–219 mm (±0.5%)
Wall Thickness: 1.5–12 mm (±5%)
Length: 6 m / 12 m standard
Surface Treatment: Outer wall pickled (NO.1)/2B; inner wall electropolished (Ra ≤0.8 μm); optional anti-rust coating
Standards: ASTM A213 TP316L, GB/T 14976-2012 seamless stainless steel pipe for fluid transport
The table below lists standard schedule dimensions for ASTM A213 TP316L seamless pipe. All values conform to ASME B36.19M. Tolerances: OD ±0.5%, wall thickness ±5% per ASTM A213. Custom OD and wall thickness outside these schedules — including our full range of 10–219 mm OD at 1.5–12 mm WT — are available on request.
| Nominal Size | Schedule | OD (mm / in) | Wall Thickness (mm) | Inside Diameter (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| DN 15 (½") | 10S | 21.3 / 0.840 | 1.65 | 17.99 | 0.80 |
| DN 15 (½") | 40S | 21.3 / 0.840 | 2.77 | 15.80 | 1.27 |
| DN 20 (¾") | 10S | 26.7 / 1.050 | 1.65 | 23.37 | 1.02 |
| DN 20 (¾") | 40S | 26.7 / 1.050 | 2.87 | 20.93 | 1.69 |
| DN 25 (1") | 10S | 33.4 / 1.315 | 1.65 | 30.10 | 1.31 |
| DN 25 (1") | 40S | 33.4 / 1.315 | 3.38 | 26.64 | 2.50 |
| DN 32 (1¼") | 10S | 42.2 / 1.660 | 1.65 | 38.89 | 1.68 |
| DN 32 (1¼") | 40S | 42.2 / 1.660 | 3.56 | 35.05 | 3.39 |
| DN 40 (1½") | 10S | 48.3 / 1.900 | 1.65 | 44.97 | 1.93 |
| DN 40 (1½") | 40S | 48.3 / 1.900 | 3.68 | 40.89 | 4.05 |
| DN 50 (2") | 10S | 60.3 / 2.375 | 1.65 | 56.97 | 2.43 |
| DN 50 (2") | 40S | 60.3 / 2.375 | 3.91 | 52.48 | 5.44 |
| DN 80 (3") | 10S | 88.9 / 3.500 | 2.11 | 84.68 | 4.54 |
| DN 80 (3") | 40S | 88.9 / 3.500 | 5.49 | 77.92 | 11.29 |
| DN 100 (4") | 10S | 114.3 / 4.500 | 2.11 | 110.08 | 5.87 |
| DN 100 (4") | 40S | 114.3 / 4.500 | 6.02 | 102.26 | 16.07 |
Need a size not listed? Contact us for a custom specification quote.
Stainless Steel Tubes Packed in Truck
Wooden Crate Packaging in Factory
Neo-Mac Machine with Stainless Steel Tubes
Factory Tube Packaging Process
Industrial Manufacturing Equipment
Stainless Steel Composition Analyzer
Specification: Φ114×4.5 mm
Performance: 10-year seawater corrosion resistance, no pitting
Case: Qingdao Seawater Desalination Project water pipelines used in seawater desalination plants.
Specification: Φ219×8 mm
Performance: Pressure resistance up to 8 MPa, withstands wave impact
Case: CNOOC Bohai offshore platform seawater pipelines used in shipbuilding yards.
Our 316L stainless steel pipe complies with:
ASTM A213 TP316L – Seamless stainless steel tube standard for high-temperature and corrosive environments
GB/T 14976-2012 – Seamless stainless steel pipe for fluid transport
Every pipe undergoes solution annealing and hydrostatic testing at 12 MPa for 30 minutes, ensuring leak-free performance under seawater pressure. Its resistance to chloride ions (30,000 ppm) and verified pitting potential ≥ +400 mV meet seawater desalination requirements.
For most piping applications, 316L is the preferred specification. The key difference is carbon content:
| Property | 316 | 316L |
|---|---|---|
| Max carbon (%) | 0.08 | 0.03 |
| Sensitization risk after welding | Moderate | Negligible |
| Corrosion resistance (welded joints) | Lower | Higher |
| ASTM standard (seamless pipe) | A213 TP316 | A213 TP316L |
| Typical application | Machined parts, non-welded assemblies | Welded pipe systems, marine, chemical |
316L's low carbon content prevents carbide precipitation at weld heat-affected zones — the main failure mode in chloride-exposed piping. If your system requires welded fabrication or will be exposed to seawater, acidic media, or chloride concentrations above 5,000 ppm, specify 316L. At equivalent wall thickness and schedule, mechanical strength is virtually identical at ambient temperature.
We supply 316L stainless steel seamless pipes in:
Outer Diameter: 10–219 mm (tolerance ±0.5%)
Wall Thickness: 1.5–12 mm (tolerance ±5%)
Length: 6 m / 12 m fixed lengths
Surface treatment options include outer wall pickling (No.1) / 2B and inner wall electropolishing (Ra ≤0.8 μm). Anti-rust coatings are available upon request.
This ensures that each order is delivered with the required specifications for seawater desalination systems and offshore engineering projects, without deviation.
Walmay will help match the right stainless product form and specification for your application, confirm quantities and packing needs, and provide requested documents based on order requirements.
