Borated low-alloy high-speed steel roller and manufacturing method thereof

Abstract

The invention belongs to the technical field of steel rolling, and relates to a roller, in particular to a borated low-alloy high-speed steel roller and a manufacturing method of the borated low-alloy high-speed steel roller. The roller comprises a roller body and a roller core, wherein the roller body comprises the following chemical components by weight percentage: 0.7-0.8% of C, 1.3-2.4% of Cr, 2.50-3.0% of B, 1.0-1.5% of W, 1.0-1.5% of V, less than or equal to 1.0% of Si, less than or equal to 0.4% of Mn, 0.09-0.12% of Ti, 0.16-0.19% of Mg, 0.10-0.12% of RE, less than or equal to 0.03% of P, less than or equal to 0.03% of S, and the balance of Fe and unavoidable trace impurities. The roller core is made of nodular cast iron. The manufacturing method of the roller comprises the steps of smelting, deoxidation and alloying, composite modification of RE-Mg, centrifugal casting and heat treatment, and then a finished product is processed. The roller and the manufacturing method have the major advantages that boride particles are major wear-proof particles; the addition amount of alloying elements is reduced, so that the production cost is lowered; and the roller is high in rigidity, good in wear resistance and thermal fatigue resistance, uniform in material, and high in accident resistance in the later period.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a roll, in particular to a boron-containing low-alloy high-speed steel roll and a manufacturing method thereof. Background technique [0002] Rolls are the main consumable spare parts in steel rolling production. The quality of rolls directly affects the surface quality of rolled materials, the productivity of rolling mill operations and the production cost of rolled materials; therefore, improving the quality of the rolls, reducing the alloy composition of the rolls, and saving the production cost of the rolls have always been The focus of attention of production enterprises. [0003] Commonly used hot roll materials are high nickel chromium infinite chilled cast iron rolls, semi-steel rolls and high chromium cast iron rolls, which are widely used because of their excellent performance, but in high nickel chromium infinite chilled cast iron rolls, carbonization M3C type is ...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the important problems existing in the high-speed steel materials used for metallurgical rolls in my country, that is, the key bottleneck of high cost due to high content of expensive alloy elements and low life due to poor wear resistance and accident resistance, and aims to be used in high-speed steel rolls Inexpensive boron replaces expensive alloy elements such as tungsten, molybdenum, vanadium, niobium, cobalt, etc., which can significantly reduce the cost of the roll and greatly improve the performance, thereby saving production costs and improving the useability and safety of the roll; boron and iron The reaction can generate high-hardness borides, which is beneficial to improve the wear resistance of the roll; the addition of appropriate excess boron can also improve the hardenability and hardenability of the roll, and the addition of titanium, yttrium, magnesium and other elements can be effective. Improve the shape and distribution of borides, improve the strength and toughness of high-boron low-alloy high-speed steel; the reduction of vanadium content can significantly reduce the segregation of vanadium element during centrifugal casting, which has a good effect on improving and stabilizing the performance of rolls