... concrete pump spare parts This is the brief introduction of our products: we produce and supply concrete pump parts( ... as follows; 1. pipe line(wear-resistant seamless or welded tube)material:45Mn2,high quality alloy steel ... pipe,st52,20#steel,etcsize:DN 125mm or DN 150mmWall thickness:4.1-7.1mmlength:3meters ... :Hi-Mn13,20#steel,st52,etcsize:DN 125mm or DN 150mm (R275,R225,R315,etc)degree:90 ...