Fatigue-resistant sendzimir mill second intermediate roll and manufacturing method thereof

The invention discloses an anti-fatigue sendzimir mill second intermediate roll and a manufacturing method thereof. The manufacturing method comprises the steps of smelting an electroslag ingot blank according to chemical components and weight percentage, forging a roll blank, performing heat treatment after forging and performing final heat treatment. The steel comprises the following chemical components in percentage by weight: 0.50-0.80% of carbon, 0.80-1.40% of silicon, 0.40-0.90% of manganese, less than or equal to 0.025% of phosphorus, less than or equal to 0.010% of sulfur, 5.00-6.50% of chromium, less than or equal to 0.25% of nickel, 1.00-1.50% of molybdenum, 0.80-1.40% of vanadium and the balance of iron and inevitable impurities. According to the manufacturing method, the ultrafine heat treatment is carried out before the normalizing treatment of the heat treatment after forging, so that the anti-fatigue sendzimir mill second intermediate roll with the roll body hardness of 78-83 HSD, the hardness