Automotive steel grades via green DRI-EAF route
The production of steel with low-residual content together with a high degree of steel cleanliness via electric steelmaking and low CO2 is possible and proved by Danieli experience.
Excellent liquid steel with low carbon [C], sulphur [S], nitrogen [N] and hydrogen [H] contents, together with very stable steel quality fulfilling the requirements for automotive, thin plate and pipe applications, is achievable by implementing proved Danieli technologies based on process know-how, suitable equipment and dedicated automation.
Everything starts within the EAF and the optimal, controlled charging mix of raw materials including, scrap, DRI, HBI and pig iron. The Danieli-patented scrap-to-melt system and Digimelter digital melting unit with its advanced controls, the acquired process know-how, and stirring in the liquid pool make it possible to send steel with low nitrogen, impurities and tramp elements to the secondary metallurgy stations.
The patented Tornado continuous scrap-charge system provides exceptional energy efficiency and low operational costs by adjusting the preheating geometry to the actual charge mix. The Eco-Pro sealed-furnace design reduces CO2 direct emissions close to zero.
Highly efficient, reliable, low-consumption vacuum degassers featuring mechanical vacuum pumps are available in different configurations –like twin-tank, twin-cover– to meet different production capacity requirements and layout constraints. Deep nitrogen removal in short treatment time, and ultra-low carbon grades production with carbon content in the range of 100 ppm are achieved thanks to the Q-Degas advanced process control.
All this, together with an advanced Danieli Automation process control with closed loop, self-learning application, and a dynamic steelmaking process –Q-Melt and Q-Ref– make it possible to replace BF/BOF steelmaking with electric steelmaking.
