Composite roll ring of high-speed steel

Abstract

The invention is a kind of high-speed steel composite collars. The outer layer of the collars is high speed steel, the core of the collars is alloy nodular cast iron, the character lies in: the chemical elements o outer layer are: C 1.2-1.5%, Si 0.3-1.5%, Mn 0.4-1.0%, Cr 3.0-6.0 %, Mo 1.0-4.0%, V 1.0-4.0%, W 0.5-3.0%, Nb 0.5-2.0%, Ti 0.01-0.5%, RE 0.01-0.5%, P<0.05%, S<0.05%, the residue is Fe; the chemical elements of the core are: C 3.0-3.8%, Si 2.2-3.2%, Mn 0.3-0.8%, Ni 0.2-2.0%, Cr<0.3%, Mo<0.3%, Mg0.03-0.1%, RE>=0.03%, P<0.1%, S<0.03%, the residue is Fe. compared with current technology, the invention has a low cost, high rigidity, good wearability, long operation life and high efficiency.

Description

technical field [0001] The invention belongs to the field of composite roll rings for rolling mills, and is particularly suitable for high-speed steel composite roll rings used in wire, bar mills, strip steel mills and section steel mills. Background technique [0002] In the prior art, along with the improvement of the quality requirements of rolled materials due to industrial development, rolling technologies such as large reductions are generally used in the rolling field. Roller rings are key components consumed in large quantities in steel rolling production. It is generally required that the surface layer of the roller ring has good wear resistance and red hardness, and the core of the roller ring should have high strength and good toughness. In order to achieve this purpose, centrifugal composite technology is generally used in the industry to produce composite roll rings, that is, the roll ring is composed of a roll core and an outer layer. Compared with a single ma...

AI Technical Summary

Problems solved by technology

However, during the spheroidizing process of nodular cast iron, due to the unstable spheroidizing process, it is easy to cause poor uniformity of the composition of the surface roller ring, resulting in a decrease in hardness and wear resistance. The shortcoming that the service life cannot meet the performance requirements, it is difficult to meet the needs of the harsh rolling conditions before the finishing rolling of the hot rolling production line

In addition, the introduction of tungsten carbide roll rings improves the operating rate of the rolling mill, and the rolling capacity can be increased by 5-10 times compared with nodular cast iron rolls. However, the disadvantages of tungsten carbide roll rings are that the roll rings have high hardness, difficult processing, and the material is brittle and easy to break. , and expensive manufacturing costs, etc., are not suitable for large-scale application

Images