Baojing Steel supplies Large Diameter Stainless Steel Seamless Pipes for demanding applications requiring high strength, corrosion resistance, pressure resistance and reliable dimensional performance.
Available in a wide range of outside diameters, wall thicknesses and lengths, with customized dimensions available according to drawings, technical specifications and project requirements.
304 / 304L · 316 / 316L · 321 / 321H · 310S · 316Ti · 317L · 347H · 2205 · 2507 · 904L · 254 SMO
Seamless · Heavy Wall · Large Diameter · Custom Length · PMI · UT · ET · Hydrostatic Testing
We can supply large diameter seamless stainless steel pipes in a broad range of standard and customized dimensions.
| Nominal Pipe Size | Outside Diameter | Common Wall Thickness Options |
|---|---|---|
| NPS 8" | 219.1 mm | 6.35 / 8.18 / 10.31 / 12.70 / 15.09 / 18.26 mm |
| NPS 9" | 244.5 mm | 6.35 / 8.18 / 10.31 / 12.70 / 15.09 / 18.26 mm |
| NPS 10" | 273.0 mm | 6.35 / 9.27 / 12.70 / 15.09 / 18.26 / 21.44 mm |
| NPS 11" | 298.5 mm | 6.35 / 8.18 / 10.31 / 12.70 / 15.09 / 20.00 mm |
| NPS 12" | 323.9 mm | 6.35 / 9.53 / 12.70 / 15.09 / 18.26 / 21.44 / 25.40 mm |
| NPS 14" | 355.6 mm | 6.35 / 9.53 / 12.70 / 15.09 / 19.05 / 25.40 mm |
| NPS 16" | 406.4 mm | 6.35 / 9.53 / 12.70 / 16.66 / 21.44 / 26.19 / 30.96 mm |
| NPS 18" | 457.2 mm | 6.35 / 9.53 / 12.70 / 15.09 / 19.05 / 23.83 / 30.96 mm |
| NPS 20" | 508.0 mm | 6.35 / 9.53 / 12.70 / 15.09 / 20.62 / 26.19 / 32.54 mm |
| NPS 22" | 558.8 mm | 6.35 / 9.53 / 12.70 / 15.09 / 20.62 / 28.58 / 34.93 mm |
| NPS 24" | 609.6 mm | 6.35 / 9.53 / 12.70 / 14.27 / 17.48 / 24.61 / 30.96 / 38.89 mm |
| NPS 26" | 660.4 mm | Customized |
| NPS 28" | 711.2 mm | Customized |
| NPS 30" | 762.0 mm | Customized |
Note: The wall thicknesses above are representative dimensions. Actual availability depends on grade, manufacturing process, applicable standard, OD/WT ratio and production requirements. Customized OD × WT combinations are available.
For project-based orders, we can supply customized combinations such as:
219.1 × 6 mm
219.1 × 8 mm
219.1 × 10 mm
219.1 × 12 mm
219.1 × 15 mm
219.1 × 20 mm
273.0 × 6 mm
273.0 × 8 mm
273.0 × 10 mm
273.0 × 12 mm
273.0 × 15 mm
273.0 × 20 mm
273.0 × 25 mm
323.9 × 6 mm
323.9 × 8 mm
323.9 × 10 mm
323.9 × 12 mm
323.9 × 15 mm
323.9 × 20 mm
323.9 × 25 mm
323.9 × 30 mm
355.6 × 6 mm
355.6 × 8 mm
355.6 × 10 mm
355.6 × 12 mm
355.6 × 15 mm
355.6 × 20 mm
355.6 × 25 mm
355.6 × 30 mm
406.4 × 6 mm
406.4 × 8 mm
406.4 × 10 mm
406.4 × 12 mm
406.4 × 15 mm
406.4 × 20 mm
406.4 × 25 mm
406.4 × 30 mm
457.2 × 8 mm
457.2 × 10 mm
457.2 × 12 mm
457.2 × 15 mm
457.2 × 20 mm
457.2 × 25 mm
457.2 × 30 mm
457.2 × 35 mm
508.0 × 8 mm
508.0 × 10 mm
508.0 × 12 mm
508.0 × 15 mm
508.0 × 20 mm
508.0 × 25 mm
508.0 × 30 mm
508.0 × 40 mm
558.8 × 10 mm
558.8 × 12 mm
558.8 × 15 mm
558.8 × 20 mm
558.8 × 25 mm
558.8 × 30 mm
558.8 × 40 mm
609.6 × 10 mm
609.6 × 12 mm
609.6 × 15 mm
609.6 × 20 mm
609.6 × 25 mm
609.6 × 30 mm
609.6 × 40 mm
Large diameter pipes in these sizes are available according to:
Grade · Wall Thickness · Length · Applicable Standard · Production Route · Project Quantity
For customers using ASME B36.19M / B36.10M nominal pipe sizes, common large-diameter sizes include:
8" · 10" · 12" · 14" · 16" · 18" · 20" · 22" · 24" · 26" · 28" · 30"
Equivalent outside diameters:
219.1 · 273.0 · 323.9 · 355.6 · 406.4 · 457.2 · 508.0 · 558.8 · 609.6 · 660.4 · 711.2 · 762.0 mm
304 / 304L
General industrial applications with excellent corrosion resistance and fabrication performance.
316 / 316L
Higher resistance to chlorides and chemical environments.
321 / 321H
Titanium-stabilized grades for elevated-temperature applications.
316Ti
Suitable for elevated-temperature and corrosive environments.
317L
Higher molybdenum content for enhanced corrosion resistance.
347H
Stabilized grade for high-temperature applications.
309S / 310S
High-temperature and oxidation-resistant stainless steels.
Excellent combination of:
High Strength + Corrosion Resistance + SCC Resistance
Widely used in:
Oil & Gas · Chemical · Offshore · Marine · Pressure Equipment
Super duplex stainless steel for severe chloride-containing environments.
Marine · Desalination · Offshore · Chemical · Oil & Gas
904L
For highly corrosive chemical environments.
254 SMO / 6Mo
For severe chloride and marine environments requiring very high pitting and crevice corrosion resistance.
| Item | Specification |
|---|---|
| Product | Large Diameter Stainless Steel Seamless Pipe |
| Construction | Seamless |
| Outside Diameter | 219.1–762 mm |
| Wall Thickness | Customized |
| Length | Fixed / Random / Customized |
| Grade | 304 / 316L / 321H / 310S / 2205 / 2507 / 904L / etc. |
| Surface | Annealed / Pickled / Polished / Customized |
| End | Plain / Beveled / Customized |
| Standards | ASTM / ASME / GB/T / EN / JIS |
| Heat Treatment | According to applicable standard |
| Inspection | PMI / UT / ET / Hydrostatic / Mechanical / IGC |
| Certificate | EN 10204 3.1 / 3.2 |
| Packing | Export Seaworthy Packing |
For large-diameter seamless pipes used in critical applications, we can provide comprehensive inspection:
OD · Wall Thickness · Length · Ovality · Straightness
Positive Material Identification to verify the actual alloy grade.
Pressure testing according to applicable standards and project requirements.
Internal and subsurface defect detection.
Surface and near-surface defect detection where applicable.
Tensile Strength · Yield Strength · Elongation · Hardness · Impact
Intergranular Corrosion Testing according to applicable requirements.
SGS · TUV · BV · Intertek or customer-appointed inspection agencies can be arranged according to project requirements.
ASTM A312 / ASME SA312
Austenitic stainless steel pipe
ASTM A213 / ASME SA213
Stainless steel boiler, superheater and heat exchanger tubes
ASTM A789 / ASME SA789
Duplex stainless steel tubing
ASTM A790 / ASME SA790
Duplex stainless steel pipe
GB/T 14976
Stainless steel seamless tubes for fluid transportation
GB/T 13296
Stainless steel seamless tubes for boilers and heat exchangers
GB/T 21833
Duplex stainless steel seamless and welded tubes
Process Piping · Offshore Equipment · Oilfield Equipment · High-Pressure Systems
Recommended:
316L · 2205 · 2507
Process Lines · Reactors · Heat Exchangers · Chemical Equipment
Recommended:
316L · 317L · 321H · 904L · 2205
Boilers · Heat Exchangers · Superheaters · High-Temperature Equipment
Recommended:
321H · 347H · 310S · 800 Series
Seawater Piping · Desalination Equipment · Offshore Structures
Recommended:
316L · 2205 · 2507 · 254 SMO
Pressure Vessels · Storage Tanks · Process Equipment
Recommended:
304L · 316L · 2205
| Large Diameter Seamless | Large Diameter Welded | |
|---|---|---|
| Construction | No longitudinal weld | Welded seam |
| Pressure Service | Excellent | Application dependent |
| Large OD | Available | Excellent |
| Heavy Wall | Excellent for suitable sizes | Excellent |
| Critical Service | Preferred for certain applications | Depending on specification |
| Dimensional Flexibility | Good | Very high |
| Production Cost | Generally higher | Generally lower |
| Typical Application | High pressure / critical service | Process / construction / general industrial |
Supply range up to 762 mm OD for selected seamless pipe applications.
304L · 316L · 321H · 310S · 2205 · 2507 · 904L · 254 SMO
We can review customer requirements based on:
OD × WT × Length
PMI · UT · ET · Hydrostatic · Mechanical · IGC · Third-Party Inspection
ASTM · ASME · GB/T · EN · JIS
MTC · Inspection Reports · Certificate of Origin · Packing List · Commercial Invoice
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