| 摘要 |
PURPOSE:To make a work roll for hot rolling withstand large Hertz stress during rolling and to enhance the wear resistance by manufacturing the roll with a Cr-Mo-V cast steel contg. a specified amount of V. CONSTITUTION:A work roll for hot rolling is manufactured with a cast steel contg. 0.6-1.2% C, <1.5% Si, <1.0% Mn, 3-7% Cr, 1-3.5% Mo and 1-3.5% V. At this time, the V content is adjusted so as to satisfy C content-(V content-1)/4.2>=0.65. The roll is heat treated by oil hardening at 1,050-1,075 deg.C and tempering at 510 or 550 deg.C. Fine V carbide particles are uniformly dispersed in the tempered martensite structure, and a work roll for hot rolling with >=61 HRC hardness and superior wear resistance is obtd. This roll withstands >=200kg/ mm.<2> Hertz stress. |
