1).used for bridge or big-span buildings 2).ASTM A416,BS,JIS 3)1860Mpa, high tension strength 4)12.7,15.24,17.8mm The main features of PC steel strand are high strength and good relaxation(low relaxation or normal relaxation), being quite straight while streching.Standard: ASTM A416 ,GB/T 5224,GB/T5223(China);,ASTMA421(USA);BS 5896(UN);JIS G3536(Japan);AS/NZS 4672(Australia);NBR-7483(Brazil); ...