... , low relaxation, high tensile strength, pre-stressing steel wire for pre-cast pre-stressed concrete Specification:Diameter: 2.9, ... Description: small sized deformed steel bars for pre-stressed concrete (ULBON)Material: Steel wire rod grade 30MnSiSize: 5.0mm, ... high tensile strength, comprehensive mechanical properties, good properties for lap welding and heat forging.Usage: PC bars mainly used in ...