... ,hardness is 62-64 3.Stable quality, and low price. flange for concrete pump pipe MaterialQ235,20#steelModelDN125,DN150,DN175,so ... , Kyokuto, Sany, Zoomlion, Ihi, Niigata1.We are a manufacturer of flange and concrete pump pipe clamp,which use the national high ... truck pipe flanges and wearing ring.We exported the advanced machine and take high-tech heat treatment technology, the hardness is ...