321 Stainless Steel Round Pipe or Tube

Product Introduction 321 Stainless Steel Round Pipe/Tube (UNS S32100 / DIN 1.4541) is a titanium-stabilized austenitic alloy that adds ≥ 5 × (C + N) titanium to the classic 18-8 base. The titanium tie-up prevents chromium-carbide precipitation during welding or service between 427 °C and 816 °C, giving the pipe long-term immunity to intergranular corrosion without post-weld anneal. We manufacture seamless and welded tubes from 6 mm to 914 mm O.D. and 0.5 mm to 25 mm wall in mill lengths up to 12 m, with finishes 2B, BA, 180-600 grit polish, mirror 8K or electropolished (Ra ≤ 0.38 µm) for ultra-clean duties. All material is dual-certified 321/321H, 100 % eddy-current or hydro-tested, and supplied with EN 10204 3.1/3.2 certificates.   Product Features Heat Resistance: retains full strength from cryogenic –196 °C to 900 °C continuous; oxidation scaling threshold ≈ 925 °C  Weld-As-Is: titanium stabilization eliminates sensitization, so heavy multi-pass orbital or manual TIG welds need no…