Series 75, its thickness should be divided into main bone and accessory bone, the thickness of main bone reaches 1.2 mm, while the thickness of accessory bone is 0.75 mm

Light steel keel is a new building material. With the development of China's modernization, light steel keel is widely used in hotels, docks, railway stations, stations, playgrounds, shopping malls, factories, office buildings, renovation of old buildings, indoor decoration settings, ceilings and other places.