Hot-rolled round steel for high carbon manganese and chrome grinding ball and method for producing same

Abstract

The invention relates to hot-rolled round steel for high carbon manganese and chrome grinding ball and a method for producing the same. The hot-rolled round steel comprises the following components by weight percent: 0.75-0.85 percent of C, 0.17-0.35 percent of Si, 0.70-0.90 percent of Mn, 0.40-0.60 percent of Cr, 0.001-0.020 percent of S, 0.01-0.20 percent of Cu, 0.01-0.20 percent of Ni, 0.010-0.060 percent of Al, 0.005-0.025 percent of P and the balance of Fe and inevitable impurities. The method for producing the hot-rolled round steel comprises the steps of smelting, alloying, casting and rolling. The end-point furnace-smelting C is controlled to be 0.4 percent or higher and the end-point furnace-smelting P is controlled to be 0.015 percent or lower; the steel is tapped when the temperature of the molten steel reaches 1630-1670 DEG C; the steel billet is cast continuously; the temperature of the molten steel in a continuously cast tundish is controlled at 1480-1495 DEG C; the continuous steel billet casting and drawing speed is controlled at 0.90-1.25m / min; the steel billet is soaked at 1180-1220 DEG C in a heating furnace; the initial rolling temperature of the steel billet is controlled at 1080-1140 DEG C; and the finishing rolling temperature of the steel billet is controlled at 850-1000 DEG C. The hot-rolled round steel is used for producing small and medium size high carbon manganese and chrome grinding ball with the rolling process. The hot-rolled round steel has the characteristics of high strength, high hardness and high wear resistance.

Description

Technical field [0001] The invention belongs to the technical field of alloy structural steel, and specifically relates to a hot-rolled round steel for ball mill grinding balls and a manufacturing method thereof. Background technique [0002] Wear-resistant materials are widely used in various sectors of metallurgy, mining, building materials, thermal power and machinery industries, in many types and large quantities. High manganese steel wear parts have been widely used for a long time as a material for grinding balls. High manganese steel wear parts that have been eliminated abroad account for a large proportion of the amount used in my country. However, under the condition of low impact conditions, their resistance Abrasiveness and life cannot be fully utilized, that is, under the condition of low-stress impact abrasive wear, high-manganese steel wear-resistant parts cannot take advantage of the material performance advantages, which increases unnecessary production costs. [00...

AI Technical Summary

Problems solved by technology

The design of ZG50SiMn2Mo wear-resistant steel mainly adopts composition design to achieve bainite structure after air cooling, but the design cost of this composition is high; ZG30CrMn2SiREB martensitic wear-resistant cast steel has low carbon content and sufficient toughness reserve, suitable for abrasive hardness medium wear parts