... the brief introduction of our products: we produce and supply concrete pump parts(fitting to Schwing and PM , Sany, Zoomlion,CIFA,etc ... as follows; 1. pipe line(wear-resistant seamless or welded tube)material:45Mn2,high quality alloy steel pipe,st52,20#steel ... (R275,R225,R315,etc)degree:90, 60,45,30,153. concrete pump coupling/clampmaterial:Hi-Mn13,20#steel,etcsize:from 2 to ...