| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a roll die for cold pilger rolling mill which is used for cold rolling of a steel tube and capable of enhancing the productivity and achieving the consistent product quality by prolonging the lifetime of a pilger roll die, and a method for manufacturing the same. Ž<P>SOLUTION: In the method of manufacturing the roll die for the cold pilger rolling mill, the terminating temperature in the forging and the rolling of steel having the composition consisting of, by mass, 0.30-0.60% C, 0.3-1.2% Si, 0.5-1.5% Mn, 1.0-4.0% Cr, 0.5-1.5% Mo+1/2W, and the balance Fe with inevitable impurities is set to be 900-1,150°C. The steel further consists of 0.05-0.5% Ni and 0.1-1.2% V+1/2Nb in addition to the above-described composition. There is also disclosed the roll die for the cold pilger rolling mill manufactured by the method. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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