... alloy steel pipe, st52, 20#steel, 1. We are a professional manufacturer of concrete pump parts in China, specialized ... boom, and so on2. We have been supplying concrete pump parts for SCHWING, PUTZMEISTER, SANY, CIFA, KYOKUTO, ZOOMLION ... Specification TypeDNThickness(mm)Length(mm)Weld-on EndsApplicable pump BrandsST52/ST37/20#/Q235steel pipe1254.03000/2000/1000148mmSchwing,Putzmeister, CIFA, Kyokuto ...