1) 1*2, 1*3 ,1*7wire P.C. steel strand 2) ASTM A416 3) low relaxation,1860Mpa 270ksi 4)Dia. 12.7,15.24,17 ... .8,21.6mm 1*2 wire P.C.strand Nor.Dia ... ;15.20;15.24;15.70;17.80;21.601*7 strand: 12.7mm,15.2mm,1860Mpa,Grade 270(ksi)Standard ... .mass per 1000m(kg/1000m)Minimum Breaking LoadMin Load at 1% Extension(KN)Lo≥610mm(%)the relaxation at 1000h)Initial to ...