To meet the requirements of higher strength, improved weldability, and higher performance placed on structural steel plates for large-scale structures in recent years while also reducing manufacturing costs, JFE Steel has developed revolutionary plate manufacturing technologies; the Super-OLAC, a next-generation accelerated cooling technology for plates with a high cooling capacity, achieving the theoretical cooling limit, and uniform cooling performance, and the HOP (heat-treatment on-line process), an induction heating-type on-line heat-treatment process which reduces delivery times. Making full use of these plate manufacturing technologies, JFE Steel has developed high quality, high performance plates for a wide range of fields.