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OCT 20 2012

Abrasion resistant steel

Casting

A Brief History of wear-resistant steel as a steel about began in the latter half of the nineteenth century. 1883 British Hadfield (R0.A0.Hadfield) first obtained the patent of the high manganese steel, has more than 100 years of history, high manganese steel is a carbon content and manganese content in high wear-resistant steel, this ancient steels with more than 100 years of history, has a strong work hardening ability due to its impact abrasive wear conditions, with both good toughness and ductility, as well as the production process is easy to grasp, etc. Therefore, the current it is still the largest amount of wear-resistant steel (especially in the mining and other sectors). In recent decades, low, development and application of rapid development of wear-resistant alloy steel, steel has good wear resistance and toughness, the production process is relatively simple, comprehensive economic and reasonable in many working conditions under the applicable , while welcomed by users. In order to adapt to the needs of the mine mining operation machinery and engineering machinery development, the development of high hardness and wear-resistant steel, from the 1970s to the 1980s in the international community has formed a series and standardization. This type of steel is developed based on low alloy high strength welded steel, and they generally use the direct quenching after rolling and tempering, or the introduction of controlled rolling and controlled cooling technology intensive, saving energy, and low content of alloying elements cheaper, but high hardness, wear-resistant, process performance can still be very popular with users because of these advantages make the kind of wear-resistant steel. Japan, Britain, the United States and other countries, some steel companies to produce the kind of wear-resistant steel.
Classification
A wide variety of wear-resistant steel, can be largely divided into high manganese steel, low alloy wear-resistant steel, chromium, molybdenum, silicon manganese steel, cavitation-resistant steel, abrasion resistant steel, and special wear-resistant steel. Common alloy steel, such as stainless steel, bearing steel, alloy tool steel and alloy structural steel as a wear-resistant steel used in specific conditions due to their convenient source of excellent performance, also account for the use of wear-resistant steel a certain proportion.
Chemical composition
Silicon, manganese, chromium, molybdenum, vanadium, tungsten, nickel, titanium, boron, copper, rare earth, etc., usually contained in the chemical elements such as wear-resistant low-alloy steel steel. Many large and medium-sized ball mill liners with chromium molybdenum silicon manganese or chromium molybdenum steel, its chemical composition shown in Table 1. Most grinding balls are used in high-carbon chromium molybdenum steel manufacturing, chemical composition, heat treatment and hardness are shown in Table 2. Workpiece or work in the higher temperature (200 ~ 500 ℃) under the conditions of abrasive wear due to friction heat the surface to withstand the higher temperature of the workpiece, can be used chromium molybdenum vanadium, chromium, molybdenum, vanadium nickel or chrome molybdenum vanadium tungsten alloy resistance The steel mill, the type of steel after quenching temperature or high temperature tempering, secondary hardening effect. Table 3 lists China for the manufacture of ball mill liner silico-manganese, chromium manganese silicon molybdenum, chromium-manganese-molybdenum low, wear-resistant alloy steel chemical composition and range of applications.