Steel is a kind of material, in which ingots, billets or steel are made into various shapes, sizes and properties we need through pressure processing. Steel is an indispensable and important material for national construction and the realization of the four modernizations. It has a wide range of applications. According to the different cross-sectional shapes, it is generally divided into four categories: profiles, plates, pipes and metal products. In order to facilitate the organization of steel production, order supply and good management, it is also divided into heavy rail, light rail, large section steel, medium section steel, small section steel, cold-formed section steel, high-quality section steel, wire rod steel, medium-thick steel plate and thin steel plate. Production method of steel: most steel products are processed by pressure, so that the processed steel (billet, ingot, etc. ) plastic deformation occurs. According to the different processing temperatures of steel, it can be divided into cold working and hot working. The main processing methods of steel are:

Rolling: The metal blank passes through the gap between a pair of rotating rollers (various shapes). Due to the compression of the rollers, the cross section of the material is reduced and the length is increased. This is the most commonly used production method for producing steel, mainly used for producing profiles, plates and pipes. Cold rolling and hot rolling.

Casting: a pressure processing method that changes the blank into the shape and size we need by using the reciprocating impact of forging hammer or the pressure of press. Generally divided into free forging and die forging, it is often used to produce materials with large cross-sectional dimensions such as large profiles and cogging.

Drawing: It is a processing method of drawing rolled metal blanks (dies, pipes, products, etc.). ) stretching through the die hole to reduce the cross section and increase the length, which is mainly used for cold working.

Extrusion: It is a processing method that metal is put into a closed extrusion box, and one end is pressed, so that the metal can be extruded from the specified die hole to get the finished product with the same shape and size, which is mostly used to produce non-ferrous metal materials.