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Synopsis : The manufacture of seamless steel pipe internally cladded with aust enitic corrosion resisting alloy has been studied and a new one-side welding method has been presented for non-accessible circumferential seam of clad steel pipe. The results obtained in this investigation are summarized as follows ; (1) The negative convergence of roll and rolling reduction more than 1.8, can prevent the seamless clad steel pipe from cracks caused by twisting of pipe and disbonding, when hot rolling method is applied to the manufacture of pipe. (2) A new one-side welding method with buffer layer of iron containing carbon stabilizer may give double wall structure and higher safety against sulphide stress corrosion crack ing to the circumferential seam of clad steel pipe. (3) A circumferential carbon steel weld metal of super alloy clad steel pipe deposited by buffer layer method, does not generate cold crack caused by hydrogen, because of la trger capacity to absorb hydrogen and shrinkage of preceding austenitic weld metal during cooling.

The Manufacturing Method of Seamless Clad Steel Pipe and Development of Circumferential Welding for the Pipe