Seamless Stainless Steel TP316LN |UNS S31653|1.4429 Pipe

Seamless Stainless Steel TP316LN Pipes (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 piping that strictly adheres to ASTM A312, ASTM A213, and ASME SA312 international standards.

Distinguished by the strategic addition of Nitrogen (0.10–0.16%), our TP316LN piping offers significantly higher yield strength than standard 316L while maintaining excellent ductility and non-magnetic characteristics even after cold working. These pipes 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 pipe 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.”