Influence of desulfurization slag containing oxides of vanadium and titanium on semi-steel pre-desulfurization

Hot Ductility Evolution Mechanism of Titanium‐Bearing Microalloyed Steels

“…Specially, the proeutectoid ferrite film around the austenite grain boundary of the tensile sample at 800 °C forms a complete ring with thicker size than that at 850 °C due to longer phase transformation time, which is in accordance with the equilibrium phase transition temperatures A e3 of 840 °C, as shown in Table 2. What is more, a small amount of intermittent or continuous proeutectoid ferrite film in the fracture of the tensile sample at 800 °C, as shown in Figure 9e, has very low strength, only a quarter of the austenite strength, [ 21,29,30 ] this results in stress concentration in the thin films of ferrite of the tensile samples, finally decreases remarkably the RA of the tensile samples, as shown in Figure 3.…”

“…Liu et al [ 16 ] and Qian et al [ 17 ] reported that Ti (C,N) particles precipitated on the grain boundaries in Ti‐bearing steel with Ti of 0.02–0.10 wt% pined the grain boundaries migration and prevented the occurrence of dynamic recrystallization, [ 18 ] accelerating the crack expansion and leading to brittle fracture of the casting billet. In addition, Mintz et al, [ 19 ] Cowley et al, [ 20 ] and Liang et al [ 21 ] pointed out that the lower‐strength ferrite films at the austenite boundary in other microalloyed steels with niobium (Ni), aluminum (Al), Ti elements, were prone to stress concentration between grains, resulting in reduced plasticity due to intergranular fracture. However, the above researches are almost focused on hot ductility in Ti‐bearing microalloyed steels with low Ti content (0.01–0.10 wt%), there are few reports on hot ductility in Ti‐bearing microalloyed steel with high Ti content (0.10–0.15 wt%).…”

A Novel Method of Recovery Vanadium from Vanadium Slag through CaO2‐Briquetting Roasting Process

“…The optimal parameters on the calcification roasting in the selected literature [ 12,23–25,29–32 ] of the past 10 years are listed in Table 2 . The optimal CaO/V 2 O 5 (all of the Ca in the raw V‐slag and from the additive are converted into CaO for unification with this article) and temperature in the present work are not much different from that reported in the literature, [ 12,23–25,29–32 ] and the slight differences are probably caused by the differences of V‐slag compositions. The authors think that the additive content and temperature should be a pair of conjugate parameters, and their effects should be considered synergistically.…”

“…However, in practical production, the lack of oxygen caused by a large amount of material accumulation will inevitably require longer roasting time, as shown in the literature. [ 32 ] In summary, the outstanding advantage of the present method is that it greatly shortens the roasting time. The disadvantage of the present method is that it needs to change the current production process and may not be accepted by large‐scale iron works.…”

Research Progress of Desulfurization Refining Slag: A Review

“…The development of refining slag is the core of LF refining, which is the key to fast and effective desulfurization refining, [4] and optimizing the composition of refining slag is an effective way to achieve steel composition control. [5][6][7] In addition, the use of a refining slag with a high desulfurization rate is critical for reducing the LF refining time and improving the refining efficiency. This study summarizes the mechanism of desulfurization of refined slag, the influencing factors of desulfurization of refined slag, and desulfurization-related models, and expounds on the current research progress and challenges faced by refining slag, providing references for iron and steel enterprises and researchers.…”