... delievery time 5.tianjin port 1.product name : black round steel pipe2. thinckness:0.3-3.0mm3.width:20-400mm4.market ... .We are mainly manufacturing welded steel pipe , hot rolled steel pipe ,cold rolled steel coil ,black steel pipe , black steel coil,galvanized steel pipe , galvanized steel coil ,cold hard steel pipe , clod hard coil ...