| 摘要 |
PURPOSE:To obtain a clad steel pipe for line pipe excellent in corrosion resistance, by combining a base material of carbon steel or low-alloy steel with a cladding material composed of a steel having a specific composition consisting of C, Si, Mn, P, S, Ni, Cr, Mo, N and Fe. CONSTITUTION:The base material composed of carbon steel or low-alloy steel is combined with the cladding material composed of highly corrosion resistant steel so as to be formed into a clad steel pipe. The above-mentioned cladding material is constituted of a steel which has a composition consisting of, by weight, <=0.02% C, <=1% Si, <=2% Mn, <=0.03% P, <=0.005% S, 30-60% Ni, 18-25% Cr, >5-12% Mo, <=0.05% N, and the balance Fe with inevitable impurities and further containing, if necessary, one or more kinds among 0.3-3% Cu, 0.3-2% W, and 0.3-2% Nb, In this way, the clad steel pipe for line pipe showing excellent corrosion resistance inside a pipe including a welding scale zone under the environment containing H2S-CO2-Cl<-> and free S can be obtained.
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