... 3 Material: 45Mn2, high quality alloy steel pipe, st52, 20#steel, 1. We are a professional manufacturer of concrete pump ... parts in China, specialized in producing concrete pump delivery pipe, ... ,7.0148mmChrome Carbide insertSchwing,Putzmeister, CIFA, Kyokuto, SanyZX-Pipe(ST52)Harden ZX-Pipe1257.0ZX-5 inchF/M FlangesPutzmeisterHigh Pressure1257 ...