... 3. T/S: 1860Mpa Name Dia. Tensile Strength Standard low relaxation unbonded Pc strand 9.53mm-15.24mm1770Mpa-1860MpaGB5224, , ASTM A 416, BS ... and coil weight requirement.Post-tensionde unbonded Prestressed concrete steel strand is suitable for cast-in-place concrete of long-span and wide buildings, large ... and grout-on, convenient use, material saved, bend easy. low relaxation unbonded pc strand