Classification of angle steel and its chemical composition

Posted by Chase Liu on April 26th, 2024

Angle steel iron is mainly divided into two types: equilateral angle steel and unequal angle steel. Among them, unequal angle steel can be divided into two types: unequal sides and equal thickness and unequal sides and unequal thickness.

The specifications of angle steel are expressed by the dimensions of side length and side thickness. At present, the specifications of domestic angle steel are No. 2-20, and the number is the number of centimeters of the side length. The same angle steel often has 2-7 different side thicknesses. Imported angle steel indicates the actual size and thickness of both sides and the relevant standards. Generally, those with a side length of more than 12.5cm are large angle steels, those with a side length between 12.5cm and 5cm are medium-sized angle steels, and those with a side length of less than 5cm are small angle steels.

The ordering of import and export angle steel is generally based on the specifications required for use, and the steel grade is the corresponding carbon structural steel grade. Also, apart from the specification number, angle steel does not have a specific composition and performance series.

The delivery length of angle steel is divided into two types: fixed length and double length. The fixed length selection range of domestic angle steel has four ranges: 3-9m, 4-12m, 4-19m, and 6-19m according to different specifications. The length selection range of angle steel produced in Japan is 6-15m.

The cross-section height of the unequal angle steel is calculated according to the long side width of the unequal angle steel. Refers to steel with an angular cross-section and unequal lengths on both sides. It is a kind of angle steel. Its side length ranges from 25mm×16mm to 200mm×125mm. Rolled by hot rolling mill. General unequal angle steel specifications are: ∠50*32--∠200*125, thickness 4-18mm

Unequal angle steel is widely used in various metal structures, bridges, machinery manufacturing and shipbuilding industries, various building structures and engineering structures, such as house beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, Container racks and warehouses, etc.

So what is the chemical composition of angle steel?

(1) Composition index: The chemical composition of angle steel belongs to the general structural rolled steel series, and the main verification indexes are C, Mn, P, and S. The content varies depending on the brand. The general range is C<0.22%, Mn: 0.30-0.65%, P<0.060%, S<0.060%.

(2) Inspection method: When testing the above chemical composition of angle steel, commonly used standard inspection methods for angle steel specifications include GB223, JISG1211-1215, BS1837, BS Manual 19, ГОСТ22536, etc.