"Development of Low Cost High Strength Steel without Accelerated Cooling Process "

by "Pancoro. P Tagentar "

Publisher - "PT. KRAKATAU POSCO, Cilegon, Indonesia "

Category - Engineering & IT

"Most urban people must have known the painstaking struggle of daily commuting traffic. In Jakarta, the traffic is so severe that we spend 5 hours travel on a route which supposedly only took 1 hour. So, in 2017, Indonesian Government proposed to build an e levated toll road from Jakarta-Cikampek as a solution for this condition. In other countries, infrastructure of the elevated toll road was built from concrete and steel. But Indonesia is mostly using concrete to make the structure due to abundant supply of limestone, which is raw material to make concrete. In comparison of concrete and steel, steel is lighter, has higher strength which can accommodate longer distance in between pier, which can reduce the cost and time of construction. Considering these advantages of steel for bridge construction, our government decided to use steel for the elevated toll road in Jakarta-Cikampek Project II which would be the first case in our country. This project needs high strength steel with minimum 570 MPa of TS. Usually, accelerated cooling and heat treatment facilities are required to produce high strength steel like JS-SM570TMC.Albeit lacking in those facilities, PT. Krakatau POSCO opted to optimize the existing facilities in order to conquer the challenge of this Jakarta-Cikampek’s 38KM Elevated Toll Road. PT. Krakatau POSCO produced the material with ultra-high temperature reheating instead of the water cooling condition, and make adjustment on rolling parameter and chemical composition to achieve the targeted properties. Up until now, the supply for this project is still on going. "

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