concrete pump pipe parts 1.20#steel 2.Forging,rolling 3. ... hardness of 62-64 4.long service life 2-3 times DN125 concrete pump pipe parts ... MaterialQ235,20#steelModelDN125,DN150,DN175,so onTechnicalForging, high-temperature ... 1.We are a manufacturer,the national high quality 20# steel (Q235), high-temperature 1200 rolling and ...