Nitrogen-containing high-carbon steel for grinding balls and low-cost smelting process thereof

Abstract

The invention belongs to the technical field of iron and steel smelting, and particularly relates to nitrogen-containing high-carbon steel for grinding balls and a low-cost smelting process thereof. The steel comprises the components in percentage by weight: 1.00-1.10% of C, 0.30-0.55% of Si, 1.05-1.15% of Mn, less than or equal to 0.025% of P, less than or equal to 0.035% of S, 0.65-0.75% of Cr,0.015-0.030% of Al, 0.010-0.025% of Ti, 60-100ppm of N and the balance Fe and inevitable impurities. According to the nitrogen-containing high-carbon steel for the grinding balls and the low-cost smelting process thereof, by properly increasing the carbon content, adding a certain amount of Al, Ti, N and other elements for microalloying and designing process parameters, the purposes of grain refinement and solid solution strengthening are achieved, the smelted grinding ball steel is uniform in chemical component, high in purity and fine in grain, the technical indexes such as abrasion resistance, hardness and toughness of the steel are effectively improved, and the use requirements of users for high-end grinding ball steel are completely met.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a nitrogen-containing high-carbon grinding ball steel and a low-cost smelting process thereof. Background technique [0002] Steel for grinding ball is the raw material for making steel ball for grinding ball. Steel ball for grinding ball is the most commonly used grinding body in ball mill. It is widely used in mining, electric power, ceramics, metallurgical machinery, cement building materials, chemical energy and other fields. It is the most consumed material among all kinds of wearable parts. Since the working state of the ball mill is that the ball will move in a circular curve with the inner wall of the cylinder as the ball mill rotates, sliding and rolling will occur here to grind the material. After being lifted to a certain height, the grinding ball breaks away from the rotating cylinder and falls to the bottom in a parabola, the balls collide with the bal...

AI Technical Summary

Problems solved by technology

However, the C content can only be selected in the range of 0.95.1.05%, and the Cr can only be selected in the range of 0.45.0.65%. If you want to improve the technical indicators such as wear resistance and hardness of the material by further increasing the carbon and chromium content, it will lead to Serious slab segregation, at the same time, when the carbon content is high, the slab is hard, and defects such as surface cracks are prone to occur during straightening and drawing, which will reduce the technical indicators such as wear resistance and impact resistance of the grinding ball, and make its service life decreased, and the quenching process of wear-resistant steel balls and the uniform surface hardness after quenching were not studied.