Galvanized rectangular tube is lighter in weight when the bending and torsional strength are the same, so it widely used in construction, machinery manufacturing, shipbuilding, steel structure engineering, power engineering, agriculture and chemical machinery. Light-gauge cold-formed steel roof purlins replace heavier hot-rolled steel angle and channel sections. A purlin is a secondary structural member that spans between the primary/main steel frame to support the roof cladding. The purlin transfers load from the roof cladding to the primary steel rafters. Similarly, a side rail is a secondary structural member that spans between the primary/main steel frame to support the wall cladding and transfer load from the wall cladding to the primary steel columns. Both purlins and side rails are used to provide restraint to the primary steel frame members. Light gauge cold-formed steel roof purlins are used on a wide range of building types including retail and leisure, industrial, warehouses and distribution, healthcare and education.Read more
U-SHAPE steel is a steel with a cross section like the letter "U" . Sometimes the Cross section is in the shape of the Japanese letter "Fu" . Main features: Withstand pressure, long support time, easy to install not easy to deformation and so on. U-SHAPED steel is widely used in the world as the main section steel in the manufacture of mine roadway compressible metal support. Main features: Withstand pressure, long support time, easy to install not easy to deformation and so on. Main uses: mainly used in the mine tunnel, the mine tunnel secondary support, as well as through the mountain tunnel support and other uses. U-SHAPED steel is widely used in the world as the main section steel in the manufacture of mine roadway compressible metal support. However, due to the different understanding of the properties and requirements of u-shaped steel itself, the section shape, geometric parameters and material of u-shaped steel vary from country to country. There are four types of u-shape steel in China, which are 18U, 25U, 29U and 36U. The first two are from the 1960s, and the last two are from the 1980s, and belong to the ear. U18s are rarely produced because of their low carrying capacity.Read more
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