Seamless Stainless Steel TP347 |UNS S34700|1.4550 Tube

Seamless Stainless Steel TP347 Tubes (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. We produces high-integrity seamless tubing that strictly adheres to ASTM A213, ASTM A269, and ASME SA213 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 aerospace components. Through advanced cold-drawing and precise solution annealing, Tengqi ensures every tube maintains a uniform microstructure and optimized mechanical strength for demanding industrial media.

"While TP347 provides excellent corrosion resistance, we also offer TP347H (UNS S34709) with higher carbon content for superior creep strength in temperatures above 1000°F."