Incoloy 825 Coiled Tubing for CO₂ Liquefaction

During the carbon dioxide liquefaction process, tubing must withstand high pressure, high temperatures, and corrosive gases simultaneously. Under liquefaction conditions, carbon dioxide pressure can exceed 7 MPa, and temperatures approach its critical point of 31.1°C, placing extremely high demands on the system’s piping for both leak-tightness and corrosion resistance. Incoloy 825 is a nickel-iron-chromium alloy containing 38% to 46% nickel, 30% to 35% iron, and 20% to 23% chromium, with added copper and molybdenum to enhance resistance to pitting, crevice corrosion, and stress corrosion cracking. Public literature indicates that the corrosion rate of Incoloy 825 in high-chloride environments is less than 0.1 mm per year, making it suitable for the transport of liquefied CO₂ and water-containing gases.

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