flange for concrete pump pipe 1,Forging&rolling, long service life ... 62-64 3.Stable quality, and low price. flange for concrete pump pipe MaterialQ235,20#steelModelDN125,DN150,DN175,so onTechnicalForging, high ... ring.We exported the advanced machine and take high-tech heat treatment technology, the hardness is 62-64 °.3.This ... may have. Best regards! DN125 Wear-resisting Flange For Concrete Pump Pipe