Special chilled cast iron roller for wire rod bar finishing mill rack and production process thereof

Abstract

The invention relates to a roller and a production process thereof, in particular to the special chilled cast iron roller for a wire rod bar finishing mill rack and the production process thereof. Theroller is prepared from chemical components of an outer layer and a core part. The outer layer is prepared from the chemical components: 3.0 to 3.2 percent of C, 0.4 to 0.60 percent of Si, 0.3 to 0.5percent of Mn, less than or equal to 0.05 percent of P, less than or equal to 0.03 percent of S, 1.25 to 1.45 percent of Cr, 0.3 to 0.5 percent of Mo, 3.0 to 3.5 percent of Ni, 0.1 to 0.3 percent ofV, 0.06 to 0.15 percent of Re, and 0.2 to 0.4 percent of Nb; and the core part is prepared from the chemical components: 3.0 to 3.5 percent of C, 2.2 to 2.60 percent of Si, 0.40 to 0.60 percent of Mn,less than or equal to 0.05 percent of P, less than or equal to 0.03 percent of S, 0.8 to 1.2 percent of Cu, larger than or equal to 0.05 percent of Mg, and the balance Fe and a small amount of residual elements. According to the special chilled cast iron roller for a wire rod bar finishing mill rack and the production process thereof provided by the invention, a traditional advantage of the chilled cast iron roller is fully played, and a carbide morphology and a roller microstructure are improved through optimized component preparation and improvement of a heat treatment process, so that a precious alloy resource is saved, a comprehensive performance of the roller is improved, and a production requirement of a steel rolling enterprise is met with a reasonable cost performance; and the on-machine rolling quantity of the roller is improved by 1.7 times compared with bainite made of a traditional material, and the roller price is only half of the price of high-speed steel.

Description

technical field [0001] The invention relates to a roll and a production process thereof, in particular to a chilled cast iron roll specially used for a wire bar finish rolling stand and a production process thereof. Background technique [0002] Due to the small difference in hardness in the working layer of the chilled cast iron roll, the rolling output is relatively close no matter in the early or late stage of the rolling operation. The hardness of the chilled cast iron roll is relatively high, especially the existence of various metal carbides, and the wear resistance of the roll is relatively excellent. For a long time, steel rolling enterprises have been applying chilled cast iron rolls to finish rolling product stands. Due to the excellent surface quality of the finished rolled parts, the rolls of this material are very popular among enterprises. With the development of rolling mills in the direction of high precision, high rigidity, high speed, and automation, new ...

AI Technical Summary

Problems solved by technology

However, because the rolls of the above materials need to consume a large amount of precious metal resources, the production process is complicated, the heat treatment requirements are high, and the roll hardness is high. It is difficult to process the pass when used in profile steel, and the time period is long, which brings many production problems to steel rolling enterprises.

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