| 摘要 |
PROBLEM TO BE SOLVED: To provide a roll die in cold Pilger mill and its manufacturing method excellent in both wear and abrasion resistance and corrosion resistance, and lasting for a long time. SOLUTION: The roll die is made of steel stock having C: 0.2-0.6%, Cr: 3-9%, Mo: 0.5-3%, P: not more than 0.02%, S: not more than 0.005% in mass percentage and having hardness of 52HRC to 60HRC, and the Sharpy impact value not less than 5 J/cm2 at normal temperature and a metal flow in the roll axis direction.
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