... 4.Used for: railway and highway bridge, roof truss Prestressed Concrete Steel Wire 1.Diameter:4.0mm~7.0mm2.Strength:1570mpa3 ... -stressed concrete members of large, medium and small-size in all structures and shapes of Pre-tensioning and Post-tensioning methods, e ... pile, electrical poles as well as construction of pre-stressed concrete water pipe, television tower,nuclear power station project, etc. ...