Angle steel specifications and common sense

Angle steel is a steel material with an L-shaped cross-section, and its cross-section is usually at a 90-degree angle. The specifications and dimensions of angle steel are as follows:

Equilateral angle steel. The two side widths are equal, and the specifications are expressed in millimeters of side width × side width × side thickness. For example, "∠30×30×3" means an equilateral angle steel with a side width of 30 mm and a side thickness of 3 mm. It can also be expressed by model number, which is the number of centimeters of side width, such as ∠3#. The specifications of hot-rolled equilateral angle steel range from 2# to 20#.
Unequal angle steel. It is divided into large waist angle steel and small waist angle steel. The size is represented by a combination of numbers and letters of the small waist width, large waist width and thickness. For example, "L-100×63×8" means that the small waist width is 100 mm and the large waist width is 100 mm. It is 63mm and the thickness is 8mm.
Size standard. Common angle steel thicknesses are 3 mm, 4 mm, 5 mm, 6 mm, etc. The length of angle steel is usually 6 meters or 12 meters. Common angle steel sizes include 20×20×3mm, 25×25×3mm, 30×30×3mm, 40×40×4mm, 50×50×5mm, 63×63×6mm, etc.
Theoretical weight. The theoretical weight (kg/m) of the national standard angle steel varies according to the long side width, short side width and side thickness. For example, the size of the "2.5/16" model is 25×16×3 mm, and the theoretical weight is 0.912kg/m; The size of the "4/2.5" model is 40×25×3 mm, and the theoretical weight is 1.522kg/m.

There are different standards for angle steel, including national standards, ISO standards and JIS standards. The model of the national standard angle steel consists of a number indicating the width of the angle steel and a letter indicating the thickness of the angle steel. For example, L45×3 means that the angle steel width is 45 mm and the thickness is 3 mm. ISO standard angle steel and JIS standard angle steel are relatively close to the international ISO standards, but there are certain differences. In addition, the dimensional parameters of Japanese standard angle steel include length, width and thickness, and its shape parameters include cross-sectional shape and number of sides. Angle steel of different shapes has different load-bearing capacity and stability, and is suitable for different structural types.