MC5 Steel and large-sized flattening roll prepared by using the same, and manufacturing process of MC5 steel

Abstract

The invention relates to an MC5 steel and a large-sized flattening roll prepared by using the same, and a manufacturing process of the MC5 steel, wherein the MC5 steel comprises the following chemical components in weight percentages: 0.75%-0.90% C, 0.40%-0.80% Si, 0.20%-0.50% Mn, 4.80%-5.20% Cr, 0.30%-0.60% Ni, 0.20%-0.60% Mo, 0.10%-0.20% V, less than or equal to 0.015% P, less than or equal to 0.015% S, less than or equal to 0.20% Cu, less than or equal to 0.01% Al, less than or equal to 0.02% Pb, less than or equal to 0.02% As, less than or equal to 0.02% Sn, less than or equal to 0.02% Sb, less than or equal to 0.02% Bi, less than or equal to 2 ppm of H, less than or equal to 30 ppm of O, less than or equal to 120 ppm of N, and rest being Fe and inevitable impurities; and the MC5 steel is capable of meeting the utilization requirements of high-end metal plate rolling and long service life of the flattening roll.

Description

technical field [0001] The invention belongs to the technical field of high-end metallurgical equipment manufacturing, relates to a 5±0.2wt%Cr-MC5 steel, and uses the steel type to manufacture large-scale leveling rolls with a finished roll body diameter of more than 800mm, and specifically relates to an MC5 steel and its preparation The large-scale leveling roll and the manufacturing process of MC5 steel. Background technique [0002] There are various methods and techniques for processing metal materials, but no matter what technique is used, it is finally put into use after rolling, forging, cutting and necessary performance treatment. Among the current processing techniques, the proportion of rolled products is far greater than that of other production techniques, and it is widely used, especially in high-end wide-width alloy plates for aerospace, steel plates for cars and other non-ferrous metals. In the production of metal materials such as strips, precision rolling i...

AI Technical Summary

Problems solved by technology

[0006]At present, large smooth rolls with a finished roll body diameter of 800mm or more are made of 2%Cr steel, which has a low degree of alloying and a hardened layer thickness of only 10mm-15mm , when rolling steel plates, the rolling capacity per 1mm roll body thickness is about 3200 tons. When rolling high-strength metal plates, water ripple-like surface defects are often formed on the surface of the plates, which is difficult to meet product requirements. Therefore, it can no longer adapt to the current high-end metal High service life requirements for plate rolling and skin pass rolls

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