ASTM A268 UNS S40900 / TP409 Ferretic Stainless Steel Seamless Tube Heat Exchanger Tube ASTM A268 TP409 (UNS S40900) is a ferritic, titanium-stabilized stainless steel seamless heat exchanger tube. It offers moderate corrosion and high-temperature oxidation resistance, good weldability/formability, magnetic structure, and low nickel cost. Supplied annealed or pickled, it commonly serves condensers, coolers, exhaust, and EGR systems. Minimum tensile strength is 380 MPa per
It's genuine 321H — titanium-stabilized, so no worries about sensitization or intergranular corrosion during welding. Our welder said it welded nicely with no cracking.
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