Steel bar for pre-stressed concrete (PC steel bar for short) is pre-stressed concrete steel with very high technical content, which is developed by Japan Neturen Co., Ltd. in the 1960s. It features high strength toughness, low looseness, strong concrete bond stress, good weldability and upset forging and material saving. It is widely applied to high strength pre-stressed concrete centrifugal pipe pile, electric pole, overpass pier and other pre-stressed concrete components, and has very wide market in the world, in Southeast Asian regions in particular.