Seamless Stainless Steel TP347 |UNS S34700|1.4550 Pipe

Seamless Stainless Steel TP347 Pipes (UNS S34700 / W.Nr. 1.4550) are high-performance austenitic solutions specifically engineered for superior resistance to intergranular corrosion and oxidation in elevated temperature environments. As a premier manufacturer based in Fujian, China, Tengqi produces high-integrity seamless piping that strictly adheres to ASTM A312, ASTM A213, and ASME SA312 international standards.

Distinguished by the strategic addition of Niobium (Columbium), our TP347 tubing prevents chromium carbide precipitation during prolonged exposure to temperatures in the 427°C - 816°C (800°F - 1500°F) range. This makes them indispensable for mission-critical applications in chemical reactors, high-pressure steam systems, and furnace components. Through advanced cold-drawing and precise solution annealing, Tengqi ensures every pipe maintains a uniform microstructure and optimized mechanical strength for the most aggressive industrial media.

“Our precision-controlled Niobium-to-Carbon ratio ensures that carbides are fully stabilized, preventing sensitization even during welding.”