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Tp347h Uns S34700 S34709 DIN1.4961 Seamless Stainless Steel Pipe. The exceptional high-temperature creep strength is attributed to its high carbon content of 0.04% - 0.10%. Its strong resistance to intergranular corrosion is due to the addition of niobium (Nb) as a stabilizing element (approximately 8 times the carbon content). Excellent oxidation resistance is also attributed to the 17-19% chromium and 9-13% nickel content, providing excellent resistance to oxidation and spalling in air and oxidizing media up to 816 c.