Alloy steel, also known as alloy steel pipe, refers to the iron carbon alloy composed of materials other than carbon and iron plus alloy elements, and an appropriate amount of one or more alloy elements are added on the basis of ordinary carbon steel. According to the different elements added and the appropriate processing technology, high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, non-magnetic and other special properties can be obtained. Alloy steel has a history of more than 100 years. Alloy steel was widely used in industry in the second half of the 19th century.
The main alloy elements of alloy steel are silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, copper, boron, rare earth, etc.
Among them, vanadium, titanium, niobium, zirconium, etc. are strong carbide forming elements in steel. As long as there is enough carbon, they can form their own carbides under appropriate conditions. When there is no carbon or under high temperature conditions, they enter the solid solution as atoms; Manganese, chromium, tungsten and molybdenum are carbide forming elements, one part of which enters the solid solution in atomic state, and the other part forms replacement alloy cementite; Aluminum, copper, nickel, cobalt, silicon, etc. are elements that do not form carbides and generally exist in the solid solution in an atomic state.
