... ,rolling 3.hardness of 62-64 4.long service life pipe to flanges MaterialQ235,20#steelModelDN125,DN150,DN175,so onTechnicalForging, high ... and production of the new generation of concrete pump truck pipe flanges and wear-resisting, forgings with high-tech heat treatment ... product is high abrasion resistance and its advantage than ordinary pipe fittings of long service life. 4.Stable product quality, ...