Seamless Stainless Steel TP316LN Tubes (UNS S31653 / W.Nr. 1.4429) are nitrogen-strengthened, ultra-low carbon austenitic solutions engineered for superior mechanical strength and exceptional corrosion resistance. As a premier manufacturer based in Fujian, China, Tengqi produces high-integrity seamless tubing that strictly adheres to ASTM A213, ASTM A312, and ASTM A269 international standards. Distinguished by the strategic addition of Nitrogen (0.10–0.16%), our TP316LN tubing offers significantly higher yield strength than standard 316L while maintaining excellent ductility and non-magnetic characteristics even after cold working. These tubes are indispensable for mission-critical applications in high-pressure chemical reactors, nuclear engineering, and cryogenic processing. Through advanced cold-drawing and precise solution annealing, Tengqi ensures every tube maintains a stable austenitic microstructure and optimized resistance to sensitization and pitting. “TP316LN offers a minimum yield strength of 205 MPa, which is higher than the 170 MPa of standard TP316L.”

Seamless Stainless Steel TP309 Pipes (UNS S30900 / W.Nr. 1.4828) are premium high-alloy austenitic solutions engineered for superior oxidation resistance and mechanical strength in elevated temperature environments. As a premier manufacturer based in China, We produces high-integrity seamless piping that strictly adheres to ASTM A312 and ASME SA312 international standards. Distinguished by its high Chromium (23%) and Nickel (13%) content, our TP309 tubing provides exceptional resistance to scaling and carburizing atmospheres at continuous service temperatures up to 980°C (1800°F). These pipes are indispensable for mission-critical applications in boiler baffles, furnace components, and high-temperature chemical processing units. Through advanced cold-drawing and precise solution annealing, We ensures every pipe maintains a uniform microstructure and optimized creep strength, offering superior durability under intense thermal stress. “For applications requiring lower carbon content to improve weldability and prevent carbide precipitation, we also offer TP309S (UNS S30908).”