The silicon content of boiling steel is not more than 0.07%; The silicon content of semi-killed steel is not more than 0.17%; The lower limit of silicon content of the killed steel is 0.12%.

Structural steel refers to steel that meets specific strength and formability grades. This formability is expressed by the elongation after the break of the tensile test.

​Steel structure is the steel plate, round steel, steel pipe, steel cable and various types of steel processing, connection, installation of the engineering structure.

The truss in the truss structure refers to the truss beam, which is a kind of beam structure with lattice structure.

Ordinary carbon structural steel follows the "Carbon structural steel" GB/T700-2006 standard. Due to its affordable price and large output, this type of steel is widely used in the field of gold struc···

The main plate and strip steel for structure are: hot steel plate and steel strip, cold rolled steel plate and steel strip. The application range of the thickness of the hot rolled steel plate is 4~20···