October 20, 2022
Carbon steel is mainly composed of iron, carbon two elements, and generally do not add a large number of alloy elements of steel, sometimes also called general carbon steel or carbon steel. Carbon steel generally contains a small amount of silicon, manganese, sulfur and phosphorus in addition to carbon. According to its use, carbon steel can be divided into carbon structural steel, carbon tool steel and free cutting structural steel. Carbon structural steel is divided into building structural steel and machine manufacturing structural steel two kinds, according to the carbon content can be divided into low carbon steel (WC≤0.25%), medium carbon steel (WC0.25% - 0.6%) and high carbon steel (WC> 0. 6%), according to phosphorus, sulfur content can be divided into common carbon steel (phosphorus, sulfur is higher), high quality carbon steel (phosphorus, sulfur is lower) and high quality steel (phosphorus, sulfur is lower), general carbon steel with higher carbon content, the higher the hardness, the higher the strength, but low plasticity.
Carbon steel has good performance, easy processing, low cost, and is the most widely used and used in engineering, but the performance of carbon steel can not meet the higher performance requirements in many aspects, mainly reflected in:
1. The strength and strength are low
2, low hardenability
3, low high temperature strength
4. Thermorigid difference
5, tempering stability is poor
6, can not meet the special requirements
In order to solve some defects of carbon steel, improve the performance of steel, obtain better properties than carbon steel - toughness, plastic toughness, corrosion resistance, dimensional stability, friction resistance, cutting property, etc., purposeful in iron carbon alloy to add some alloy elements, the formation of alloy steel. Alloy steel refers to steel containing silicon and manganese as alloying elements or deoxyelements, but also contains other alloying elements (such as chromium, nickel, molybdenum, vanadium, titanium, copper, tungsten, aluminum, cobalt, niobium, zirconium and other elements, etc.), some also contain some non-metallic elements (such as boron, nitrogen, etc.) steel. According to the amount of alloying elements in the steel, it can be divided into low alloy steel, medium alloy steel and high alloy steel.
