... , long service life 2.Q235,hardness is 62-64 3.Stable quality, and low price. flange for concrete pump pipe MaterialQ235,20 ... and concrete pump pipe clamp,which use the national high quality 20# steel (Q235).After high-temperature 1200 forging, and rolling ... service life and is superior to ordinary pipe fittings.4.Stable quality, and low price.5.In Shanghai port, FOB price.6 ...