Carbon steel is an iron-carbon alloy with a carbon content of 0.0218%~2.11%, also known as carbon steel. It also contains small amounts of silicon, manganese, sulfur and phosphorus. In general, the higher the carbon content of carbon steel, the greater the hardness, the higher the strength, but the lower the plasticity.
1. less than 0.25%C is low carbon steel, especially with carbon less than 0.10% of 08F, 08Al, because of its good deep drawing and weldability and is used as a deep drawing parts such as automobiles, cans...... And 20G is the main material for ordinary boilers. In addition, mild steel is also the most popular as carburizing steel, used in machinery manufacturing.
2. 0.25 ~ 0.60%C is medium carbon steel, mostly used in the condition of conditioning, the production of machinery manufacturing industry parts. How many conditioning 22~34HRC, can get comprehensive mechanical properties, but also easy to cut.
3. Higher than 0.6%C is high carbon steel, which is mostly used for manufacturing springs, gears, rolls, etc. According to the different manganese content, it can be divided into ordinary manganese content (0.25 ~ 0.8%) and higher manganese content (0.7 ~ 1.0% and 0.9 ~ 1.2%) two steel groups. Manganese can improve the hardenability of steel, strengthen ferrite, and improve the yield strength, tensile strength and durability of steel. Usually, "Mn" is added after the grade of steel with high manganese content, such as 15Mn and 20Mn, to distinguish it from carbon steel with normal manganese content.
Carbon tool steel carbon content between 0.65 ~ 1.35%, after heat treatment can get high hardness and high strength, mainly used in the manufacture of various tools, cutting tools, molds and measuring tools
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