... flange for concrete pump pipe 1,Forging&rolling, long service life 2.Q235,hardness is 62-64 3.Stable quality, and low ... price. flange for concrete pump pipe MaterialQ235,20#steelModelDN125,DN150,DN175,so onTechnicalForging, high-temperature 1200 forging and ... the national high quality 20# steel (Q235).After high-temperature 1200 forging, and rolling,it’s shaped.2.The company ...