The promotion and application of Vertical roller mills in the cement industry has put forward higher and higher requirements for the wear resistance of Vertical roller mill and discs. Due to the severe working conditions of vertical grinding rollers, the surface of the rollers is severely abraded. Therefore, when manufacturing mills, the vertical grinding roller sleeves and disc liners are generally cast with a wear-resistant alloy (high chromium cast iron or nickel hard cast iron) or The composite wear-resistant surfacing welding method is used to improve the wear resistance and service life of the roller body and the grinding disc. Due to the shortcomings of the roller body itself, such as the brittleness of the roll body and the difficulty of surfacing repair, many domestic and foreign companies have begun to adopt the composite wear-resistant surfacing method when manufacturing large Vertical roller mill and discs. That is, the roller body is made of low-carbon steel and low-alloy steel with good toughness, and the surface is welded with abrasion-resistant materials for effective protection. In this way, not only can the surface of the workpiece have excellent abrasion resistance, but also the roll can have good comprehensive mechanical properties without the risk of cracking or breaking. In addition, the workpiece of this steel body can be welded multiple times, greatly reducing the cost of spare parts of the equipment. Therefore, composite wear-resistant surfacing is a current development trend.
In the vertical roll grinding roll overlay welding project, the quality of the welding wire determines the service life of the grinding roll after surfacing. At present, the welding wires used for vertical grinding surfacing are high chromium alloy cast iron flux cored wires. According to the requirements of different working conditions and different requirements for wear resistance, the alloy types of high chromium alloy cast iron flux cored wires are mainly 3 Species: