Bainite alloy steel roller and preparation process thereof

Abstract

The invention discloses a bainite alloy steel roller and a preparation process thereof, and belongs to the technical field of roller manufacturing, the bainite alloy steel roller is characterized in that the bainite alloy steel roller comprises the following components of 0.5%-0.9% of C, 0.3%-0.6% of Si, 0.4%-0.8% of Mn, 0.8%-1.5% of Cr, 3.5%-4.0% of Ni, 0.5%-0.8% of Mo and the balance iron and inevitable impurities, and according to the preparation process of the bainite alloy steel roller, the bainite alloy steel roller comprises the following components in percentage by weight: 0.5%-0.9% of C, 0.3%-0.6% of Si, 0.4%-0.8% of Mn, 0.8%-1.5% of Cr, 3.5%-4.0% of Ni, 0.5%-0.8% of Mo and the comprising the following preparation steps that S1, molten steel is smelted, and the smelted molten steel is poured to obtain a roller; s2, heat treatment is conducted, specifically, the roller is heated to 880-1100 DEG C, and heat preservation is conducted for more than 10 hours; the preparation method comprises the following steps of: heating the alloy steel roll to 300-500 DEG C, preserving heat for 2-10 hours, heating to 500-650 DEG C, preserving heat for more than 8 hours, cooling to 200 DEG C or below along with a furnace to obtain the bainite alloy steel roll, and adjusting chemical components in the alloy steel roll and matching with a heat treatment process to ensure that the cooling temperature of the roll is not in a martensite region, so that a matrix structure mainly comprising bainite is obtained; and the strength and hardness of the alloy steel are effectively improved.