Steel introduction Steel is an alloy of iron with C, Si, Mn, P, S and a small amount of other elements. In addition to Fe, the content of C plays a major role in the mechanical properties of steel, so it is collectively referred to as iron-carbon alloy. It is the most important and most used metal material in engineering technology. Classification and nature According to different carbon content, iron-carbon alloy is divided into two major categories: steel and pig iron. Steel is an iron-carbon alloy with a carbon content of 0.03% to 2%. Carbon steel is the most commonly used ordinary steel, which is convenient for smelting, easy to process, low in price, and can meet the requirements of use in most cases, so the application is very common. Carbon steel is divided into low carbon steel, medium carbon steel and high carbon steel according to the carbon content. As the carbon content increases, the hardness of carbon steel increases and the toughness decreases. Alloy steel, also known as special steel, adds one or more alloying elements to the carbon steel to change the microstructure and properties of the steel, thus having some special properties, such as high hardness, high wear resistance, high toughness, Corrosion resistance, and so on. The alloying elements frequently added to steel are Si, W, Mn, Cr, Ni, Mo, V, Ti, and the like. China's alloy steel resources are quite rich. Except for Cr and Co, the Mn grade is low, and the reserves of W, Mo, V, Ti and rare earth metals are very high. At the beginning of the 21st century, the proportion of alloy steel in the total output of steel will increase significantly. About pig iron An iron-carbon alloy containing 2% to 4.3% of carbon is called pig iron. The pig iron is hard and brittle, but it is pressure and wear resistant. According to the form of carbon in pig iron, it can be divided into white iron, gray iron and ductile iron. The carbon in white iron is distributed in the form of Fe3C, the fracture is silvery white, the quality is hard and brittle, and it can not be mechanically processed. It is the raw material of steel making, so it is also called steel pig iron. The carbon is distributed in the form of flake graphite, which is called gray iron. The fracture is silver-gray, easy to cut, easy to cast and wear-resistant. If carbon is distributed in spheroidal graphite, it is called ductile iron, and its mechanical properties and processing properties are close to that of steel. Special cast iron can be added to the cast iron to obtain special cast iron. If Cr is added, the wear resistance can be greatly improved, and it is very important under special conditions. For this elite talent, it is also the most scarce in China. At present, there are many steel alloys in the iron alloy industry. It is a professional recruitment and job search website for the iron alloy industry talents. Caterpillar Parts,Caterpillar Engine Parts,Cheap Caterpillar Parts,Caterpillar Forklift Parts JINING SHANTE SONGZHENG CONSTRUCTION MACHINERY CO.LTD , https://www.sdkomatsugenuineparts.com