Carbon steel is an iron-carbon alloy with carbon content of 0.0218%~2.11%. Also called carbon steel. Generally also contains small amounts of silicon, manganese, sulfur, phosphorus. Thehigher the carbon content in general carbon steel, the greater the hardness, the higher the strength, but the lower the plasticity.
Classification of carbon steel
(1) Carbon steel can be divided into carbon structural steel, carbon tool steel and free cutting structural steel, carbon structural steel is divided into engineering construction steel and machine manufacturing structural steel two kinds;
(2) according to the smelting method can be divided into open hearth steel, converter steel;
(3) According to deoxygenation method can be divided into boiling steel (F), sedation steel (Z), semi-sedation steel (B) and special sedation steel (TZ);
(4) 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%).
(5) According to the quality of steel, carbon steel can be divided into ordinary carbon steel (higher phosphorus and sulfur), high quality carbon steel (lower phosphorus and sulfur) and high quality steel (lower phosphorus and sulfur) and super high quality steel.
Its advantages are:
1, it can make the hardness increase after heat treatment, and the wear resistance will be better.
2, he is suitable in the annealing hardness, and excellent plasticity, can facilitate the construction.
3, its raw materials are common, so it is very convenient to find, without consuming a lot of cost.
Common Grades Of Carbon Steel
A36：The most common standard of carbon steel plate
A283：A very common structural steel plate available in A, B, and C
A516：A typical carbon steel plate found in boiler vessels
A537：Heat-treated carbon steel plate that’s common in fusion-welded pressure vessels
A573：Another structural steel plate with carbon, manganese, and silicon
A572：A carbon steel plate with higher mechanical strength than A36 at a lower weight
A737：Another carbon steel plate that’s found in boiler pressure vessels requiring lower carbon steel
Uses of carbon steel
High carbon steel, often called tool steel, has carbon content from 0.60% to 1.70% and can be hardened and tempered. Hammers, crowbars, etc. are made of steel with a carbon content of 0.75%; Cutting tools such as drills, taps and reamers are made of steel with a carbon content of 0.90% to 1.00%. General high carbon steel strength is very high, widely used in cutting, drilling, lathe, milling machine and so on the need for high hardness requirements of the environment.
Carbon steel with a carbon content of 0.25% ~ 0.60%. Sedation steel, semi – sedation steel, boiling steel and other products. In addition to carbon, it can also contain a small amount of manganese (0.70% ~ 1.20%). According to the product quality is divided into ordinary carbon structural steel and high quality carbon structural steel. The hot working and cutting performance is good, but the welding performance is poor. The strength and hardness are higher than low carbon steel, and the plasticity and toughness are lower than low carbon steel. Without heat treatment, hot rolled or cold drawn materials can be used directly or after heat treatment. Medium carbon steel after quenching and tempering has good comprehensive mechanical properties. The highest hardness can be achieved is about HRC55(HB538), σb is 600 ~ 1100MPa. So in the various uses of medium strength level, medium carbon steel is the most widely used, in addition to as a building material, but also a large number of mechanical parts for manufacturing.
Low carbon steel also known as mild steel, low carbon steel carbon content of 0.04-0.3%, is the most common grade of carbon steel. Mild steel is also considered low carbon steel because it is defined as having a low carbon content of 0.05 to 0.25%. Mild steel is malleable and highly malleable and can be used in automotive body parts, panels and wire products. At the high end of the low carbon range, with up to 1.5% manganese, mechanical properties are suitable for stampings, forgings, seamless tubes and boiler plates. Carbon content from 0.10% to 0.30% low carbon steel is easy to accept all kinds of processing such as forging, welding and cutting, often used in the manufacture of chains, rivets, bolts, shafts, etc
