ASTM A312 TP316L Large Diameter Stainless Steel Pipe
Material Grade：TP316L (UNS S31603)
Manufacturing Type：Welded (Longitudinal) / EFW (Electric Fusion Welded)
Size Range (NPS)：8", 10", 12", 14", 16", 18", 20", 24", 30" (up to 36")
Schedule (WT)：SCH 5S, 10S, 20S, 40S, 80S
Surface Finish：Solution Annealed & Pickled (No. 1 Finish)
Technique：Cold Finished/Argon Arc Welding
Section Shape：Round
Specification：OD 6.35~762mm
Length：Customized by Client and Typically 6000mm
TP316L stainless steel pipe manufacturer
Are you currently sourcing large-diameter stainless steel pipes (DN300–600 and above) but remain concerned about weld defects, dimensional deviations, or inspection failures? GNEE effectively resolves common challenges such as weld failure, installation misalignment, and project delays.
GNEE is a trusted global supplier with over 18 years of extensive experience in the field of large-diameter stainless steel pipes. Our products are exported to more than 50 countries worldwide, with an annual shipment volume exceeding 2,000 tons. We hold ISO 9001 and PED certifications and welcome inspections by third-party agencies such as SGS, BV, and TÜV.
Our ASTM A312 TP316L large-diameter stainless steel pipes are manufactured using advanced TIG (Tungsten Inert Gas) and plasma welding processes. We implement rigorous quality control measures on our welds to ensure uniform weld reinforcement, and to guarantee that they are free from undercut, porosity, and cracks. For critical dimensions specifically DN300–600 we strictly adhere to the tolerance requirements of the ASTM A312 standard: outer diameter tolerances are controlled within ±0.5%, and wall thickness tolerances within +12.5% / –10%. This ensures that our pipes possess exceptional structural integrity and pressure-bearing capabilities.
Regarding delivery quality, we offer options for both fixed and random lengths. We employ precision cutting techniques to ensure that pipe ends are cut squarely, are free of burrs, and remain free of deformation thereby ensuring that the pipes are ready for immediate welding and installation right out of the box.
ASTM A312 TP316L Large Diameter Pipe Dimensional
1. Dimensional Table (NPS 14" to 36" per ASME B36.19/B36.10)
Note: Large diameter pipes in ASTM A312 are frequently provided as Welded (WLD) due to manufacturing limits of seamless pipes at these sizes.
| NPS (Inch) | DN (mm) | Outside Diameter (mm) | Sch 5S (WT mm) | Sch 10S (WT mm) | Sch 40S/STD (WT mm) | Sch 80S/XS (WT mm) |
| 14" | 350 | 355.6 | 3.96 | 4.78 | 9.53 | 12.70 |
| 16" | 400 | 406.4 | 4.19 | 4.78 | 9.53 | 12.70 |
| 18" | 450 | 457.2 | 4.19 | 4.78 | 9.53 | 12.70 |
| 20" | 500 | 508.0 | 4.78 | 5.54 | 9.53 | 12.70 |
| 24" | 600 | 609.6 | 5.54 | 6.35 | 9.53 | 12.70 |
| 30" | 750 | 762.0 | 6.35 | 7.92 | 9.53 | 12.70 |
| 36" | 900 | 914.4 | 6.35 | 7.92 | 9.53 | 12.70 |
Chemical Composition (Mass Weight %)
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) |
| Requirement |
≤≤ 0.030 |
≤≤ 2.00 |
≤≤ 0.045 |
≤≤ 0.030 |
≤≤ 1.00 |
16.0 – 18.0 | 10.0 – 14.0 | 2.00 – 3.00 |
Mechanical Properties (Minimum Values)
| Property | Metric Units | Imperial Units |
|---|---|---|
| Tensile Strength (Rm) | ≥ 485 MPa | ≥ 70 ksi |
| Yield Strength (Rp0.2) | ≥ 170 MPa | ≥ 25 ksi |
| Elongation (A5) | ≥ 35% | ≥ 35% |
| Hardness (Max) | ≤ 192 HBW / 90 HRB |
≤ 192 HBW / 90 HRB |
Dimensional Tolerances forASTM A312 Large Diameter Pipes
Reference Standard: ASTM A999 / A999M
Critical for Large Pipes: Buyers worry about "Ovality" (out-of-roundness).
| Nominal Pipe Size (NPS) | Outside Diameter (OD) Tolerance | Wall Thickness (WT) Tolerance | Ovality (Out-of-Roundness) |
| 8" to 18" | +2.4 mm / -0.8 mm | -12.5% | Included in OD tolerance |
| 20" to 24" | +3.2 mm / -0.8 mm | -12.5% | Included in OD tolerance |
| Notes | Measured at any point | Minimum wall thickness | Internal bracing recommended for SCH 10S |
TP316 stainless steel erw pipe socket
GNEE exports low carbon 316L welded pipes to 65 countries and regions around the world every year. The price is 5% lower than other suppliers. The production quality is strictly guaranteed, and there is a professional after-sales service team of 20 people. To solve any doubts and provide project solutions for you! If you are looking for 3-A certified stainless steel welded pipes, please contact us for a quote!
Quality Inspection
Heat Treatment: Solution Annealing (Min. 1040°C) + Rapid Quench.
Surface Finish: Pickled & Passivated (Matte White).
Weld Seam Inspection: 100% Radiographic Testing (RT) / X-Ray (for welded pipes).
Pressure Test: 100% Hydrostatic Test or Eddy Current Test.
Material Verification: 100% PMI (Positive Material Identification) to confirm Mo/Ni content.
SS 316L Welded Pipe Packaging
FAQ
What is the difference between ASTM A312 and ASTM A358 for large diameter pipes?
ASTM A312 is for general corrosive service and includes both seamless and welded pipes. ASTM A358 is specifically for EFW pipes intended for high-temperature and heavy-duty service. A358 requires more rigorous Radiographic Testing (X-ray) and has multiple "classes" (Class 1 to 5) to define the weld quality.
Why choose TP316L for large infrastructure projects instead of TP304L?
TP316L contains 2.0-3.0% Molybdenum (Mo), which provides much better resistance to pitting corrosion in chloride-rich environments (like seawater or wastewater) compared to TP304L. For large-scale projects like desalination or chemical plants, 316L ensures a significantly longer service life.
Can you provide beveled ends for on-site welding?
Yes. Large diameter pipes are usually joined by welding, so we provide Beveled Ends (per ASME B16.25) as a standard requirement to facilitate easy on-site installation.
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