... production. PC Steel Bar Description: small sized deformed steel bars for prestressed concreteMaterial: 30MnSiSize: 6.1mm, 7.1mm, 7.4mm, ... ≤4.0%, Low Relaxation ≤2.0%Feature: good properties for lap welding and heat forging, low relaxation, comprehensive mechanical properties.Usage: PC bars ... sheet; coil weight 1.0-2.0 tonsPC steel wires and bars are mainly used to electric concrete pole, railway ...