What are the classifications of round steel?
(1) Low carbon steel is also called soft steel, with a carbon content ranging from 0.10% to 0.30%. Low carbon steel is easy to accept various processing such as forging, welding and cutting, and is often used to make chains, rivets, bolts, shafts, etc.
(2) Medium carbon steel Carbon steel with a carbon content of 0.25% to 0.60%. There are many products such as calm steel, semi-calcined steel, boiling steel, etc. In addition to carbon, it can also contain a small amount of manganese (0.70% to 1.20%). According to product quality, it is divided into ordinary carbon structural steel and carbon structural steel. It has good hot processing and cutting performance, but poor welding performance. The strength and hardness are higher than those of low carbon steel, but the plasticity and toughness are lower than those of low carbon steel. It can be used directly as hot-rolled or cold-drawn material without heat treatment, or it can be used after heat treatment. Medium carbon steel has good comprehensive mechanical properties after quenching and tempering. The highest hardness that can be achieved is about HRC55 (HB538), so medium carbon steel is widely used in various uses with medium strength levels. In addition to being used as a building material, it is also widely used in the manufacture of various mechanical parts.
(3) High carbon steel is often called tool steel, with a carbon content ranging from 0.60% to 1.70%, which 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, reamers, etc. are made of steel with a carbon content of 0.90% to 1.0%.
