... 64 3.Stable quality, and low price. flange for concrete pump pipe MaterialQ235,20#steelModelDN125,DN150,DN175,so onTechnicalForging, high-temperature 1200 ... of flange and concrete pump pipe clamp,which use the national high quality 20# steel (Q235).After high-temperature 1200 forging, and rolling ... with any questions you may have. Best regards! DN125 Wear-resisting Flange For Concrete Pump Pipe