GNEE provides high-quality ASTM A312 TP316 stainless steel welded pipes, combining ERW/EFW welding processes with weld heat treatment and internal/external pickling and passivation to ensure superior corrosion resistance and formability. Strictly adhering to the ASTM A312 standard, the pipes achieve outer diameter tolerances of ±0.79 mm (for 1/2-2 inches) and ±1.59 mm (for 2.1-4 inches), with wall thickness tolerances of ±10%, supporting common specifications from 1/2 inch to 12 inches (DN15-DN300) as well as customization for large diameters and thin walls. Each pipe undergoes multiple quality verifications, including eddy current testing (ET), hydrostatic testing, and optional weld radiographic inspection (RT), ensuring no internal defects or leakage risks.
TP316 Stainless Steel Pipes & Tubes Chemical Composition:
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 316 | min. | – | – | – | – | – | 16.0 | 2.00 | 10.0 | – |
| max. | 0.08 | 2.00 | 0.75 | 0.045 | 0.03 | 18.0 | 3.00 | 14.0 | 0.10 | |
316 SS Pipe Physical properties:
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 316 | 8000 | 193 | 15.9 | 16.2 | 17.5 | 16.3 | 21.5 | 500 | 740 |
ASTM A312 TP316 ERW Pipe Mechanical Properties
| Material | Temperure | Heat | Yield Strength | Tensile Strength | Elongation |
| º F(º C) Min. | Treatment | Ksi (MPa), Min. | Ksi (MPa), Min. | ||
| ASTM A312 TP316 | 1900(1040) | Solution | 30(205) | 75(515) | 35 |
Size Range:
| Production | Outside Diameter | Wall Thickness |
| Welded Pipe | 6.00mm to 830mm | 0.5mm to 48mm |
Standard Specification:
ASTM A249 / A249M - 10a Standard Specification for Welded Austenitic Steel Boiler, Superheater,
Heat-Exchanger, and Condenser Tubes
ASTM A269 - 10:Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing
for General Service
ASTM A312 / A312M - 12:Standard Specification for Seamless, Welded, and Heavily Cold Worked
Austenitic Stainless Steel Pipes
Why Choose Gnee as Your Supplier
Over 18 years of export experience in stainless steel pipe manufacturing
50,000 m² factory with advanced TIG and plasma welding equipment
100% PMI, hydrostatic, and ultrasonic testing before delivery
ISO 9001, SGS, BV certified quality management system
Global clients in 60+ countries, with strong performance in Asia, Europe, and the Middle East
Packaging and Marking:
Packaged in bales or laminated wooden crates, wrapped in plastic, and appropriately protected to ensure seaworthiness for transport, or as required.
Marking must comply with Specification A1016/A1016M. Marking must include information on whether the pipe is hot-finished or cold-finished, including but not limited to: standard, grade, size, heat number, and batch number.
