Rare earth-containing high-strength and tough roll steel, its preparation method and heat treatment process

Abstract

The invention provides high strength-toughness roll steel containing rare earth as well as a preparation method and a heat treatment technology of the high strength-toughness roll steel. The heat treatment technology comprises the following steps: performing high temperature annealing, primary normalizing, secondary normalizing and tempering treatment on the high strength-toughness roll steel containing rare earth, wherein the temperature for high temperature annealing treatment is 700 DEG C; the temperature for primary normalizing and secondary normalizing is 820 to 890 DEG C; and the tempering temperature is 550 to 590 DEG C. The hardness of a product prepared through the method can reach 245 to 310 HBS, and a normal temperature impact energy AK value is greater than 220 to 260 J. The high strength-toughness roll steel containing rare earth has the advantages of less alloying elements, high hardness, high toughness and long service life.

Description

technical field [0001] The invention relates to the technical field of material forming, in particular to a rare earth-containing high-strength and toughness roll steel, a preparation method and a heat treatment process thereof. Background technique [0002] The roll is a tool for plastically deforming (rolled material) metal, and is an important consumable part that determines the efficiency of the rolling mill and the quality of the rolled material. The roll is an important part of the rolling mill in the rolling mill. It uses the pressure generated by a pair or a group of rolls to roll and roll the steel. It is subjected to dynamic and static loads, wear and temperature changes during its rolling work. The high hardness and high toughness of the material has always been the goal of rolling steel material selection. However, when the general material hardness is high, the toughness is poor. For example, Zhang Yingyun et al. studied the quenching and tempering process of ...

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Problems solved by technology

However, when the general material hardness is high, the toughness is poor. For example, Zhang Yingyun et al. have studied the quenching and tempering process of roll steel after normalizing. The corresponding hardness is 269-302HBS, and the impact toughness Aku is 27-45J.

Yang Qingxiang and others have developed rare earth-containing roll steel through electric arc furnace smelting. Although the inclusions have been improved, there is no report on the improvement of hardness and toughness.

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