Post Tensioning ASTM Standard 12.7mm Steel PC Strand Good Performance Characteris (1)high tensile strength and elongation; (2)low relaxation value; (3)small stress losing; (4)excellent durable anti-fatigue performance. INTRODUCTION A branch factory of HENGXING group (listed in 2007) Professional on PC Steel Strand manufacturing An annual output of 300,000 tons ISO management certificated China National construction steel quality supervision and test center certificated Cooperated with National railway for many years