The extrudate is an object with a certain geometric shape made of iron or steel and materials with certain strength and toughness (such as plastic, aluminum, glass fiber, etc.). ) by rolling, extrusion, casting and other processes. Classification of section steel: according to the different smelting quality of steel, section steel is divided into ordinary section steel and high-quality section steel. Ordinary section steel is divided into large steel, medium steel and small steel according to the current metal product catalogue. Ordinary section steel can be divided into I-beam, channel steel, angle steel, H-beam, section steel and round steel according to its section shape. Large section steel: I-beam, channel steel, angle steel and flat steel in large section steel are all hot rolled, while round steel, square steel and hexagonal steel are not only hot rolled, but also forged and cold drawn.