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347H stainless steel seamless tube. The material name is 347H; it is also known by various names depending on the context and standards, such as TP347H, SUS347H, 07Cr18Ni11Nb, 1.4550. Chemical composition: Elements – C, Si, Mn, Cr, Ni, S, P, Nb; contents: 0.04–0.10, ≤0.75, ≤2.00, 17.00–20.00, 9.00–13.00, ≤0.03, 0≤0.035. Strength properties: Tensile strength, yield strength, elongation, hardness – ≥515, ≥205, ≥35 HB, ≤187. Physical properties: Density 7.9 g/cm3, melting point 1398°C–1427°C. Product characteristics: 347H stainless steel seamless tube is an austenitic stainless heat-resistant steel as well as an acid-resistant stainless steel; it possesses excellent corrosion resistance, welding properties, and heat resistance. Its general corrosion resistance is similar to that of 18-8 type TP304H steel. Due to the presence of Nb, its resistance to intergranular corrosion is significantly improved compared to TP304H. The solution-treated TP347H steel showed no tendency to intergranular corrosion, but after sensitization at 650°C, it exhibited a slight tendency to intergranular corrosion. 347H stainless steel seamless tubes exhibit excellent corrosion resistance when used in solutions of acids, alkalis, salts, and the like. Application fields: 347H stainless steel seamless tubes are widely used in industries such as aviation, petrochemicals, food, and papermaking as heat-resistant materials. Used in the superheaters and reheaters of large boilers, steam pipes, heat exchanger tubes in the petrochemical industry, as well as other corrosion-resistant parts and welded components. It can also be used as a welding core for welding chromium-nickel stainless steel. Production process: cold drawing/cold rolling. Product shapes: round tubes, square tubes, rectangular tubes, oval tubes, etc