A nitrogen-containing high-carbon steel for grinding balls and its low-cost smelting process

Abstract

The invention belongs to the technical field of iron and steel smelting, and in particular relates to a steel for nitrogen-containing high-carbon grinding balls and a low-cost smelting process thereof. Its composition is calculated by weight percentage as C: 1.00-1.10%, Si: 0.30-0.55%, Mn: 1.05-1.15%, P≤0.025%, S≤0.035%, Cr: 0.65-0.75%, Al: 0.015-0.030 %, Ti: 0.010-0.025%, N: 60-100ppm, and the rest are Fe and unavoidable impurities. In the present invention, by appropriately increasing the carbon content, adding a certain amount of Al, Ti, N and other elements for microalloying, and designing process parameters, the purpose of grain refinement and solid solution strengthening is achieved, and the chemical composition of the smelted grinding ball steel is uniform and high in purity. , the grain size is small, which effectively improves the technical indicators of steel such as wear resistance, hardness, and toughness, and fully meets the requirements of high-end grinding ball steel users.

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.