Nucor Steel has chosen Danieli to supply a new quenching and self-tempering system to be installed at its mill in Marion, Ohio. The quenching and self-tempering process improves the mechanical properties of deformed bars, particularly yield strength, using billets with lower alloy content. The result is a product with final technological characteristics equal to or better than those obtained by low-alloyed/micro-alloyed steels.
The new system is designed for rolling speeds up to 13 meters/second for single- and multi-strand rebar, and it is controlled by a dedicated stand-alone system provided by Danieli Automation. Commissioning is expected in the next few months.