According to the different smelting quality of steel, section steel is divided into ordinary section steel and high-quality section steel. According to the current metal product catalogue, ordinary section steel is divided into large section steel, medium section steel and small section steel. According to its section shape, ordinary section steel can be divided into I-beam, channel steel, angle steel, round steel, etc. Large section steel: in large section steel, I-beam, channel steel, angle steel and flat steel are hot rolled. In addition to hot rolling, round steel, square steel and hexagonal steel are also forged and cold drawn.

I-beam, channel steel and angle steel are widely used in industrial buildings and metal structures, such as factory buildings, bridges, ships, agricultural machinery and vehicle manufacturing, power transmission towers and transportation machinery. Flat steel is mainly used for bridges, house frames, fences, power transmission, ships, vehicles, etc. Round steel and square steel are used as various mechanical parts, agricultural machinery accessories, tools, etc.

Medium section steel: medium section steel, groove, angle, round and flat steel are similar to large section steel

Small section steel: the processing and use of angle, round, square and flat steel in small section steel are similar to that of large section steel. Small diameter circle is often used as building reinforcement.