... steel wire for pre-cast pre-stressed concrete Specification:Diameter: 2.9, 3.0, 3.5, 4.0, 4 ... 1770, 1860 N/mm2Relaxation: 70% breaking load, 1000hour relaxation 2.0% maxElongation: Lo=100/200/250mm, 4.0% minPacking: ... 0mm, 6.0mm, 7.1mm, 9.0mm, 10.7mm, 12.6mm Standard: YB/T111, GB/T5223.3, JISG3137, KSD3505 ... 1280 N/mm2Elongation 5.0% min, Straightness 2.0mm/m maxNormal Relaxation 4.0% max, Low Relaxation ...