Buy Stainless Steel 309/309S Buttweld Fittings, Forged Fittings, Flanges & Outlet Fittings – Manufactured to ASTM/ASME Standards – IBR, NACE, PED Certified. We are an ISO 9001:2015 certified manufacturer and global exporter of premium-grade Stainless Steel 309 and 309S (UNS S30900 / S30908) products. Engineered for high-temperature service, our offerings include buttweld fittings, forged fittings, flanges, and branch outlet fittings (olets) designed for thermal stability and corrosion resistance. Manufactured in accordance with ASTM A182, ASTM A403 and dimensional standards like ASME B16.5, B16.9, B16.11, MSS SP-97, our components meet global industrial requirements with guaranteed quality and timely worldwide delivery. Stainless Steel 309/309S is an austenitic chromium-nickel alloy developed for elevated temperature applications. Grade 309 offers high oxidation resistance up to 1100°C (2010°F), while 309S, its low-carbon variant, is better suited for welded structures to prevent carbide precipitation. Both grades provide excellent strength, creep resistance, and corrosion performance in sulfur-rich and oxidizing environments. We supply buttweld pipe fittings (elbows, tees, reducers), flanges (WNRF, SORF, Blind, Lap Joint), forged fittings (socket weld/threaded, Class 3000–9000), and olets (Weldolet, Threadolet, Sockolet) in schedule SCH 10 to XXS and pressure classes 150 to 2500. 309/309S stainless steel is extensively used in industries where thermal performance is critical, including furnace components, heat exchangers, boiler baffles, kiln linings, petrochemical heaters, incinerators, and refinery processing equipment. Its resistance to scaling, heat fatigue, and intergranular corrosion makes it ideal for continuous and cyclic heating environments. These alloys are also suitable for marine atmospheres, chemical plants, and pulp & paper facilities, especially where welding is required with sustained temperature exposure. All 309/309S products are rigorously tested and supplied with EN 10204 3.1/3.2 mill test certificates, NACE MR0175 compliance, and third-party inspection on request. Quality assurance includes PMI, ultrasonic, hardness, and intergranular corrosion testing, ensuring durability and traceability. We maintain large…