... 1.Construction Corrugated Steel Pipe/Corrugated Steel Culvert 2.Pipe for Road culvert,mining,civil use 3.SS400 Q23 4.Galvaniz Construction Corrugated Steel Pipe/Corrugated Steel Culvert ... Construction Corrugated Steel Pipe/Corrugated Steel Culvert1.Highway and railway: culvert, passage, bridge, tunneling overhaul, temporary sidewalk2. Municipal works and construction: utility tunnel, optical cable ...