| 摘要 |
PROBLEM TO BE SOLVED: To provide a tool for producing a seamless tube having eccellent heat resistance, wear resistance and scale peeling resistance and to provide its production method. SOLUTION: This tool for producing the seamless tube has a composition containing, by mass, 0.1 to 0.4% C, 0.1 to 0.3% Si, 0.3 to 1% Mn, 0.5 to 3% Ni, 0.3 to 1% Cr, 1 to 3% Mo, 2 to 4% W, 2 to 5% Co, 0.2 to 0.7% Nb, 0.05 to 0.2% Ti and 0.02 to 0.2% sol.Al, and the balance substantially Fe. Also the tool has an oxidized scale layer whose thickness is >=1,000 microns on its surface layer.
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