Basic introduction of ordinary carbon structural steel

Basic introduction of ordinary carbon structural steel

Round steel is divided into hot rolled, forged and cold drawn. The size of hot rolled round bar is 5.5-250 mm. Among them: 5.5-25 mm small round bars are mostly supplied as straight steel tendons, and are often used as steel bars, bolts and various mechanical parts; 25 mm round bars are mainly used for the manufacture of mechanical parts, seamless steel pipe billets, etc.

Ordinary carbon structural steel, also known as ordinary carbon structural steel, has a wide range of restrictions on carbon content, performance range, phosphorus, sulfur and other residual element content. In my country and some countries, according to the delivery guarantee conditions, it can be divided into three categories: a-grade steel (a-grade steel) is a steel with guaranteed mechanical properties. Grade B steel (grade B steel) is a steel whose chemical composition is guaranteed.

Special steel (C-grade steel) is a kind of steel that can guarantee both mechanical properties and chemical composition. It is usually used to manufacture important structural parts. A3 steel (A3 grade steel) has a carbon content of about 0.20%, which is the most produced and used steel in my country and is mainly used in engineering structures.

Some carbon structural steels also add a small amount of aluminum or niobium (or other carbide-forming elements) to form nitride or carbide particles to limit grain growth, enhance the strength of the steel, and save steel.

In my country and some countries, in order to meet the special requirements of professional steel, the chemical composition and properties of ordinary carbon structural steel have been adjusted, and a series of ordinary carbon structural steel (such as bridges, buildings, steel bars, pressure vessel steels, etc.) have been developed. ) of professional steel.