6mm C45 1045 4140 carbon steel round bar Black 10mm Steel Round Rod 1055 Carbon Steel Round Bar

Round steel refers to long solid steel with circular section. Its specifications are expressed in diameter, in millimeters (mm). For example, "50mm" means round steel with a diameter of 50mm.Classification by chemical composition Carbon steel can be divided into low carbon steel, medium carbon steel and high carbon steel according to chemical composition (i.e. carbon content).

1.Low carbon steel

Also known as mild steel, low carbon steel with carbon content from 0.10% to 0.30% is easy to accept various processing, such as forging, welding and cutting. It is commonly used in the manufacture of chains, rivets, bolts, shafts, etc.

2.Medium carbon steel

Carbon steel with carbon content of 0.25% ~ 0.60%. There are killed steel, semi killed 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, it is divided into ordinary carbon structural steel and high-quality carbon structural steel. Good hot working and cutting performance, poor welding performance. The strength and hardness are higher than those of low carbon steel, while the plasticity and toughness are lower than those of low carbon steel. Hot rolled and cold drawn materials can be directly used without heat treatment, and can also be used after heat treatment. Medium carbon steel is the most widely used in various applications with medium strength level. In addition to being used as building materials, it is also widely used to manufacture various mechanical parts.

3.High carbon steel

It is often called tool steel, with carbon content ranging from 0.60% to 1.70%, which can be hardened and tempered. Hammer and crowbar are made of steel with carbon content of 0.75%; cutting tools such as drill bit, tap and reamer are made of steel with carbon content of 0.90% to 1.00%.