| 摘要 |
PROBLEM TO BE SOLVED: To provide a roll at a low cost which is tough in the inner portion and hard in the surface portion required as a roll having a good wear resistance and dent resistance. SOLUTION: A roll is made from an alloy containing C 0.8-1.2 mass%, Si 0.3-0.5 mass%, Mn 0.4-0.6 mass%, Cr 2.5-4.0 mass%, Mo 0.3-0.5 mass%, V 0.3 mass% max., balance FE plus inevitable impurities. The Vickers hardness of the surface portion of 4 to 8-mm depth from the surface to the center portion is 900 Hv min. and that of the deeper portion than this surface portion is less than 900 Hv.
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