steel research international

Thermally activated dissipation of stored energy and resulting microstructural reorganization of a Ti-added steel have been monitored by dynamic calorimetry. The studies revealed that the kinetics of stored energy release and resulting structure formation is basically a dispersive one, involving more than one relaxation time. However, it is possible to isolate the energy barriers for recovery and recrystallization stages by modeling the rate of energy dissipation through isokinetic formalism of thermally activated rate processes.

The rotary multi-nozzle cup atomizer is proposed to granulate the molten slag at a high cooling rate without water consumption in this study. The disintegration mechanism, flight trajectory and heat transfer models of the droplet have been successfully developed. The results can provide guidance for designing the commercialized atomizer and optimizing the operation parameters of atomizer.

Mixture of waste iron oxide fines and lime fines are micro-pelletized without binder using CO₂/industrial waste gas at room temperature that can provide a good handling strength. Subsequently, the developed micro-pellets are sintered without using coke breeze. Waste materials itself provides heat for sintering. The produced sinter would be useful as a synthetic flux in basic oxygen process for early formation of oxidizing slag to make refining faster.

The partition ratios of phosphorous between CaO–SiO₂–Fe_tO–P₂O₅ slag with Na₂O or K₂O addition and solid pure iron were measured at different temperatures to learn about those between the same slag and carbon-saturated iron. The experimental results shows that both Na₂O and K₂O addition can improve the dephosphorization ability of the experimental slag and they have similar dephosphorization ability under the same experimental conditions.

In present work, adiabatic carbon rates are compared between smelting reduction and direct reduction along idealized conditions. Both oxygen-enrich and pre-heating air are optimized methods to decrease carbon rate of hot metal production. From the figure, the total adiabatic carbon rate of “Direct reduction-Melting” process may be lower than 440 kg tHM⁻¹.