Square tube purlin has a wide range of applications in building structures, such as the skeleton of steel structures, supporting columns and beams of buildings. Square tubes are often used as support, load-bearing, and seismic components in the structures. The compressive and flexural performance significantly improves the safety and stability of buildings.
Square tube purlin is a lightweight thin-walled steel pipe with a hollow square cross-section, also known as a cold-formed steel profile. The beam is rolled from strip steel through processing. Generally, the strip steel is unpacked, flattened, curled, and welded into circular tubes, which are then rolled into square tubes and cut to the required length.
According to the cross-sectional shape, square tube purlins are classified into square tube beams and rectangular tube beams. The cross-sectional shape of square tube is square, usually used lightweight steel frames, decorative materials, etc. The cross-sectional shape of a rectangular tube is rectangular, with a large aspect ratio, and is usually used in fields such as building structures and bridge construction.
For example, square tube purlins are often used in columns, beams, stairs, and other parts of high-rise buildings to increase structural stability and safety. Square tubes also play an important role in bridge engineering. Square tubes can be used as materials for bridge decks, piers, and bridge supports to carry and transmit loads on bridges, ensuring their normal operation and service life.
Square tube purlins are generally made of steel or aluminum. The commonly used materials for steel include Q235, Q345, and 16Mn, while the commonly used materials for aluminum include 6061 and 6063. The following factors need to be considered for choosing the material:
As a structural material, square tube purlins need to have sufficient strength to withstand external loads. Compared to aluminum, steel has higher strength and can meet more demanding usage conditions.
If the square tube is to be used in corrosive environments, the corrosion resistance of the material becomes particularly important. Aluminum has good corrosion resistance and can be used in many natural environments. Steel square tubes need to undergo rust prevention treatment to improve their corrosion resistance such as hot-dip galvanizing, spraying, etc.
