In recent decades, the development and application of NM450 wear-resistant plates have developed rapidly. This type of steel is developed on the basis of low alloy high-strength weldable steel, which has good wear resistance and a service life several times that of traditional structural steel plates; The production process is relatively simple. Usually, direct quenching and tempering after rolling, or controlled rolling and cooling are used for strengthening. The product is suitable for various working conditions. The development of wear-resistant steel in China started relatively late. In the past decade, the introduction of engineering machinery manufacturing technology has broken the low level state of traditional 16Mn steel and begun to develop towards economic and high-performance directions.
The alloy element content of NM450 wear-resistant plate is relatively low, usually 1% -3%. Usually, chemical elements include silicon, manganese, chromium, molybdenum, vanadium, nickel, titanium, boron, copper, rare earth, etc. Table 1 shows the chemical composition of the main brands of imported wear-resistant plates.
Most of the alloy elements added by domestic steel mills to produce NM450 wear-resistant plates are resource-rich elements in China, such as Cr, Si, Mn, B, re, etc. This type of steel has the characteristics of high hardness, high wear resistance, good plasticity and toughness, and good weldability. Its strength is usually greater than 1000MPa, which is a very high strength product of carbon steel plate in the current supply state.
NM450 wear-resistant plates are widely used in mining machinery, coal mining and transportation, engineering machinery, and cement equipment, and can meet the requirements of large engineering machinery for high wear resistance, long service life, and simple cold forming in harsh environments. For example, it is used to manufacture shovels and buckets for bulldozers and loaders, coal mine electric shovels, automatic loading and unloading trucks, and bottom liners for scraper conveyor slots. In addition, various types of wear occur between workpieces in relative motion in machinery, which requires improving the wear resistance of the workpiece material or using wear-resistant steel.
