Large Bore Heavy Section Stainless Welded Pipe

Our comprehensive range addresses the most demanding industrial conveying requirements with precision-engineered solutions. The Big Bore Heavy Gauge Stainless Welded Tube delivers high-flow capacity for process lines, while the Oversized Diameter Robust Wall Stainless Pipe withstands intense hydrostatic pressures in offshore riser systems. For corrosive chemical environments, the Wide Bore Stout Wall Stainless Welded Tubing offers exceptional molybdenum-enriched pitting resistance. Structural applications benefit from the Extra Large Caliber Heavy Section Steel Pipe, engineered for deep piling and caisson construction. All variants share a common DNA of high-purity filler metals, controlled heat input, and rigorous post-weld inspection to guarantee sound fusion zones.

The Large Bore Heavy Section Stainless Welded Pipe is manufactured via longitudinal submerged arc welding (LSAW) or spiral welding techniques, permitting continuous production of diameters exceeding 60 inches. This product integrates a fully normalised weld microstructure to eliminate susceptibility to intergranular attack. Whether conveying superheated steam or chilled liquefied gas, the Large Bore Heavy Section Stainless Welded Pipe maintains dimensional stability and leak-tight sealing through thermal cycles. Its thick cross-section reduces vibration amplitude, making it the default choice for compressor station headers and refinery transfer lines.

Detailed Technical Parameters

Every pipe is dimensionally verified and traced back to the heat number. The following list and table represent standard offerings; project-specific grades and dimensions are continuously added to the portfolio.

• Outer diameter scope: 16″ (406.4 mm) to 96″ (2438.4 mm) – intermediate sizes are available.
• Wall thickness gauge: 0.375″ (9.53 mm) up to 3.937″ (100 mm) covering Schedule 10 through 160.
• Material designations: TP304/L, TP316/L, TP321, TP347H, S31803 (2205 Duplex), S32760 (Super Duplex), UNS N08925.
• Production standards: ASTM A358 Class 1/2/3, ASTM A312, ASME SA358, NACE MR0175/ISO 15156 for sour service.
• Joint configuration: Single or double welded, with 100% automatic SAW; reinforcement can be removed on request.
• End finishes: Plain square-cut, 30°-37.5° bevel, or Victaulic-style groove; plastic end protectors fitted as standard.
• Non-destructive examination: 100% UT of the weld seam and HAZ, dye penetrant, plus hydrostatic proof testing at 1.5× design pressure.
• Tolerance adherence: OD ≤ ±0.75%, wall thickness ≤ ±10% local, straightness ≤ 0.2% of overall length.
• Surface condition: Pickled and passivated, achieving a uniform silvery-white finish with typical Ra ≤ 6.3 μm.
• Documentation package: EN 10204 3.1 material certificate, PMI results, and full dimensional control report.

Staple Dimension Matrix

The above parameters are extracted from the active mill program. Custom wall proportions, lengths up to 80 feet via barge delivery, and exotic alloy combinations can be engineered for LNG terminals, supercritical boilers, and geothermal field gathering lines. Every joint issued for shipment is permanently marked and accompanied by a full electronic traceability link, ensuring that the Large Bore Heavy Section Stainless Welded Pipe integrates seamlessly into the asset integrity system of any major project.