Grating, also known as steel grating, with flat plus rail (flat steel, twisted steel, pipe, etc.) made of a welded steel products, which is used widely. More than 95% of the steel grating products are made of carbon steel production. In exceptional circumstances will use stainless steel. Product range is very diverse, depending on the raw materials can be divided into: I type, tooth, complex, depending on the functional use can be divided into: platform type, trench cover and treads several. The preparation method is divided into different bonding type, pressure and plug-type locking. Bearing steel: bear the main load bearing steel flat center spacing: the distance between the centers of two adjacent bearing steel center to. Rail: orthogonal to the load twisted square steel, round or flat on the flat. Priority use twisted square steel. Rail center spacing: the distance between the centers of two adjacent center to the crossbar. Hemming plate: bearing steel welded grating or other openings, flat steel or steel cut edge manufacturing practices: pressure welding grating: hosting flat steel and bars at every intersection, by pressure resistance welding Fixed steel grating, called bonding steel grating. Pressure welding steel grating crossbar usually twisted square steel. Pressure lock grating: flat and each bearer at the intersection of rail, rail pushed by pressure bearing steel or pre-start and a good groove bearing steel, which was fixed steel grating, saying the pressure lock steel grating. Pressure lock steel grating crossbar usually flat.