A method for strengthening cast iron rolls

Abstract

The invention provides a reinforcing method of a cast iron milling roller and belongs to the technical field of metal surface treatment. The reinforcing method comprises the following steps that firstalloy powder is adopted for carrying out first laser cladding on the roller face of the cast iron milling roller, and a first alloy layer is formed on the roller face; and second alloy powder is adopted for carrying out second laser cladding on the first alloy layer, a second alloy layer is formed on the surface of the first alloy layer, and the reinforced cast iron milling roller is obtained. Bythe adoption of the method, by controlling the composition of the first alloy powder and the second alloy powder, the surface quality of the cast iron milling roller can be improved remarkably, the steel passing amount of the milling roller is increased, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for strengthening cast iron rolls. Background technique [0002] In the process of steel rolling production, cast iron rolls often experience early wear and fatigue due to the special shape of the rolled steel, especially cast iron angle steel rolls, cast iron bar rolls, cast iron H-shaped rolls, etc., how to improve the cast iron rolls The amount of steel used and the service life have become the key factors restricting the cost per ton of steel for iron and steel enterprises. [0003] Cast iron rolls that have only undergone traditional heat treatment have low roll surface hardness, short service life, and low steel passing capacity. Moreover, due to the particularity of the cast iron material, it is difficult to achieve its strengthening by traditional methods, such as traditional spray welding technology, plasma cladding and other technologies, becau...

AI Technical Summary

Problems solved by technology

[0003] Cast iron rolls that have only undergone traditional heat treatment have low roll surface hardness, short service life, and low steel passing capacity

Moreover, due to the particularity of the cast iron material, it is difficult to achieve its strengthening by traditional methods, such as traditional spray welding technology, plasma cladding and other technologies, because of their large heat input in the welding process, through them to strengthen the roll surface, often resulting in new rolls Cracks on the surface lead to the scrapping of the roll and failure to complete strengthening; however, the use of laser alloying technology can easily lead to extremely poor alloyed surface quality, a large number of pores and trachoma, and these defects directly affect the quality of steel products in production. Defective rolls make the surface of the rolled steel rough and poor in appearance, which affects the product delivery and product prices of steel companies