... PM Concrete Pump Spare Parts-Boom Pipe Material:ST52, 45Mn2, 20#,Q235 Brand: Schwing, PM, Sany, Kyokuto DN125 5 1/2" Concrete Pump ... -glass plate, cutting ring, concrete placing boom, and so on2. application: We have been supplying concrete pump parts for SCHWING, PUTZMEISTER, SANY ... concrete pump pipe is quenched and carried out carburizing chemical treatment on the inner wall.So it possess high wear ...