[Aluminium.com] The addition of titanium to steel not only improves the formability and non-aging properties of steel, but also prevents austenite grain growth and promotes the formation of fine ferrite. Therefore, titanium is widely used in hot-rolled steel and machinery. Parts steel, tool steel, corrosion resistant steel and other steels. Although titanium alloys are generally added after the deoxidation of aluminum, titanium still has a strong binding force with oxygen and therefore may affect the composition of the inclusions. South Korea's Pohang discovered that the inclusions that cause cracks in the can ends are mainly Al2O3 and Al2O3-TiO2. Tata Steel of India dismantled the nozzles of cast titanium-aluminum-containing killed steels and found that there were Al-Ti composite oxides in the nozzle nodules; similar studies also suggested that large Al2TiOX was the cause of water nozzle nodules.
Scholars of Zhejiang University for the titanium alloyed aluminum killed steel, thermodynamic calculation results show that the stable deoxidation product is Al2O3, Al2TiO5 will only be formed after the aluminum content in the steel is less than 0.008%. Through sampling and analysis of the actual smelting process of Ti-IF steels, it was found that after the addition of ferrotitanium, unstable Al-Ti composite oxides may appear in the steel. This may be due to the gradual reaction between titanium oxides in ferrotitanium and aluminum in steel. The product formed; in the casting process, when the content of reducible oxides such as SiO2 in the tundish covering agent is relatively high, the loss of aluminum at the steel-slag interface is very serious, and thus a local titanium-rich region is generated near the molten steel side. In order to meet the thermodynamic conditions for the formation of Al2TiO5 or Ti3O5, the resulting titanium oxide can easily be entrained in the molten steel under turbulent motion conditions.
(Source: Steelmaking)
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