Thermodynamic model and mechanism of non-alloyed hydrogen deoxidation of GCr15 bearing steel

A new method of non-alloyed hydrogen deoxidation is proposed, and the hydrogen deoxidation of GCr15 is studied using thermodynamic modelling. Deoxidation by blowing hydrogen is dominated by hydrogen molecular, and the degree of deoxidation depends on pH(2)O/pH(2), which is independent of [H]. Carbon and hydrogen will compete for deoxidation during the blowing of hydrogen. The deoxidation mode depends on the relationship between the actual pH(2)/OpH(2) and the critical pH(2)/OpH(2). The system pressure has a great influence on the carbon / hydrogen deoxidation equilibrium. Under vacuum conditions, carbon has a stronger deoxidation ability than hydrogen. Finally, a new process for hydrogen deoxidation was proposed. In the later stage of converter smelting, hydrogen was blown to reduce the excess oxygen -> tapping, and hydrogen was blown to alternate deoxidation of carbon and hydrogen -> sufficient carbon powder was added into the ladle -> RH treatment, and hydrogen was stopped to blown, and carbon deoxidation occurred.

Automated summary

A new method of non-alloyed hydrogen deoxidation is proposed and the hydrogen deoxidation of GCr15 is studied using thermodynamic modelling. The results show that carbon and hydrogen compete for deoxidation during the blowing of hydrogen, and the degree of deoxidation depends on the ratio of hydrogen to water vapor. It is also found that carbon has a stronger deoxidation ability than hydrogen under vacuum conditions.