Non-heat-treated wear-resistant steel rod for rod mill and manufacturing method thereof

Abstract

The invention relates to the technical field of hot-rolled round steel, in particular to a non-heat-treated wear-resistant steel rod for a rod mill and a manufacturing method thereof. By weight percentage, including the following chemical composition: C: 0.45% ~ 0.75%, Si: 0.25% ~ 0.35%, Mn: 0.90% ~ 1.50%, P: ≤0.03%, S: ≤0.03%, Cr: 0.50% ~1.0%, B: 0.002%~0.004%, V: 0.03%~0.05%, Nb: 0.02%~0.04%, and the balance is Fe and unavoidable impurities. It specifically includes the following steps: continuous casting billet heating: controlled rolling: controlled cooling: cooling bed slow cooling: the present invention has undergone reasonable optimization of the components of each element to ensure that the components are relatively easy and stable to control during smelting, and a reasonable compression ratio is selected for the process. Rolling ensures the compactness of the internal structure of the steel bar, and adjusts the controlled rolling and controlled cooling processes to obtain products with more excellent properties. A mechanical performance test of the obtained test steel rod shows that the surface hardness of the non-heat-treated wear-resistant steel rod for the rod mill of the present invention is much higher than that of the hot-rolled round steel, and the mechanical performance is stable.

Description

technical field [0001] The invention relates to the technical field of hot-rolled round steel, in particular to a non-heat-treated wear-resistant steel rod for a rod mill and a manufacturing method thereof. Background technique [0002] Rod mill steel rod is a crushing medium used to crush materials in the mill, widely used in metallurgical mines, cement building materials, thermal power generation, flue gas desulfurization, magnetic materials, chemical industry, coal water slurry, pellets, slag, Ultrafine powder, fly ash, calcium carbonate, quartz sand and other industries. Steel rods for rod mills require dense structure, high surface hardness, good core toughness, and good wear resistance. It is best to be able to produce in length according to user requirements and reduce overall costs. [0003] There are currently two types of wear-resistant steel bars on the market, one is hot-rolled round steel and the other is heat-treated steel bars. The internal structure of hot-...

AI Technical Summary

Problems solved by technology

Due to the secondary heating in the induction heating furnace, a decarburized layer will be formed on the surface, which will affect the surface hardness and wear resistance of the steel rod; due to the large size of the round steel, the internal residual temperature of the steel rod after quenching is high, and the cooling effect of one spray often reaches less than expected

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