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,

Spiral steel pipe is a spiral seam steel pipe made of strip steel coils as raw material, often warm-extruded under urban pressure, spirally bent and formed by automatic double-wire double-sided submerged arc welding process for inner seam and outer seam welding. The raw materials are strip steel coi