High-toughness wear-resisting medium manganese steel hot rolled plate and manufacturing method thereof

Abstract

The invention provides a high-toughness wear-resisting medium manganese steel hot rolled plate and a manufacturing method thereof. The high-toughness wear-resisting medium manganese steel hot rolled plate is prepared from the following chemical components in percentage by mass: 0.8-1.2% of C, less than or equal to 0.8% of Si, 7.0-9.0% of Mn, less than or equal to 0.030% of P, less than or equal to 0.005% of S, 1.5-2.0% of Cr, 0.2-1.0% of Mo, 0.2-1.0% of Mo, 0.2-1.0% of V, less than or equal to 0.2% of Nb, less than or equal to 0.05% of Ti, less than or equal to 0.04% of Al, less than or equal to 0.003 of B and the balance of Fe and inevitable residual impurity elements. The manufacturing method of the hot rolled steel plate comprises the following steps: smelting liquid steel according to set element components, after performing vacuum degassing treatment (external refining) on the liquid steel, performing continuous casting to form a continuous casting blank or die casting and initial rolling to form a steel billet, heating the steel billet at 1250 DEG C and then performing multi-pass rolling with the total reduction rate of not lower than 65% and the pass deformation rate of 10-20% at a final rolling temperature not lower than 1050 DEG C; next, performing solution treatment on the rolled steel plate at a solution temperature not lower than 1050 DEG C, controlling the surface temperature of the steel plate after coming out of water not to be lower than 300 DEG C, and finally obtaining the steel plate, wherein the tensile strength of the obtained steel plate is 700-900MPa, the normal-temperature impact toughness Akv of the steel plate is greater than or equal to 90J, and the hardness of the steel plate after water toughening treatment is less than or equal to 250HBW. The obtained steel plate is suitable for scraper conveyor middle grooves, self-discharging truck compartment plates, ball mill lining plates, feed bin lining plates and the like applicable under the conditions of medium and low loads.

Description

technical field [0001] The invention belongs to the technical field of rolling of wear-resistant metal materials, and in particular relates to a hot-rolled plate of strong toughness wear-resistant medium manganese steel and a manufacturing method thereof. Background technique [0002] Abrasion is one of the main failure modes of materials. According to incomplete statistics, only in the metallurgy, mining, electric power, coal and agricultural machinery sectors in China, the annual economic loss caused by workpiece wear is about 40 billion yuan. Therefore, the development of wear-resistant materials directly Affected the service life of the worn workpiece. Wear-resistant steel is a kind of wear-resistant material widely used in various wear conditions. There are many types, which can be roughly divided into high-manganese steel and medium- and low-alloy wear-resistant steel. [0003] High manganese steel has excellent work hardening performance. When the material is work ha...

AI Technical Summary

Problems solved by technology

The microstructure of this type of steel is martensite or martensite-bainite, and the hardness can reach 300-600HB. However, due to the complex geological conditions of coal mining and the harsh service environment, the commonly used wear-resistant steel (wear-resistant The grade is generally 400 or 450), and its wear resistance is increasingly unable to meet production needs

The higher level of wear-resistant steel (above 500), although the strength and wear resistance have been improved, but the toughness and fatigue performance are even more insufficient, especially the welding performance is very poor, and the application is more difficult