... ,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 ... technology, the hardness is 62-64 °.3.This series of products is high abrasion resistance.It is long service life and ...