1.Flanged Crrugated Steel Pipe/Plate 2.Pipe for Road culvert,mining,civil use 3.SS400 Q23 4.Galvanized and ... culvert, passage, bridge, pilotage pipeline, drainage pipeline4. Coal mine: minerals transporting pipeline, workers and mining machine passage, aven/ ... grain stock, fermentation tank, wind power generation6. Military use: military sidewalk, air-defense passage, evacuation passage Technical ...