ASME SA213 UNS S34709 / TP347H Stainless Steel Seamless Tube Pickled Annealed Heat Exchanger Tube ASME SA213 TP347H / UNS S34709 is a Nb-stabilized austenitic stainless steel seamless tube with high-temperature creep strength and sensitization resistance. This material is very common used in heat exchangers. EN 1.4961 is a related European grade, but it has different Cr/Ni chemistry. They can be dual-certified only with tight chemistry control. For ASME work, order and
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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