he concrete pump straight pipe is made of special alloy steel ( 45Mn2). The inner pipe wall is case hardened by CNC high-frequency induction hardening machine. The inner pipe wall becomes a wearable layer with high hardness.  Specification of Concrete Pipe Type DN Thickness (mm) Length (mm) Weld-on Ends Weight (kgs) Applicable Pump Brands ST52 Seamless pipe 125