1) Small and medium-sized steel bars, wire rods, steel bars, medium-diameter steel pipes, steel wires and wire ropes, etc., can be stored in a well-ventilated material shed, but must be placed on top and under the pad.　　2) Some small steels, thin steel plates, steel strips, silicon steel sheets,

Steel pipes can be used to transport fluids and powdered solids, exchange thermal energy, and make mechanical parts and containers, it is also an economical steel. For example, the use of steel pipes to make grids, pillars and mechanical supports for building structures can reduce the weight and