Composite Tube

Abstract: A double tube comprising: an inner tube provided with ribs and formed of a ferrite steel; and an outer tube formed of an austenite steel, wherein the chemical composition of the inner tube includes, in mass%, 0.01-0.30% of C, 0.01-0.80% of Si, 0.01-2.00% of Mn, 0.030% or less of P, 0.0100% or less of S, 0.01-3.50% of Cr, 0.050% or less of Al, and 0.0005-0.0500% of N, the remaining portion being Fe and impurities, and the chemical composition of the outer tube includes, in mass%, 0.10% or less of C, 0.01-0.80% of Si, 0.01-3.50% of Mn, 0.040% or less of P, 0.0100% or less of S, 5.0-70.0% of Ni, 15.0-35.0% of Cr, 1.500% or less of Al, and 0.001-0.350% of N, the remaining portion being Fe and impurities.

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