Analysis Of Thermodynamics Behavior Of Vanadium In Steel And Steel-slag

For the relevancy of N to unfavored brittleness effects, it has being seen as ill factors by metallurgical circle for a long period, while this is changed by the development of high N steels on the basis of the understanding and focus on desired interacition of N with alloy-making elements. With a comprehensive overview on the status quo and the worldwide evolution of VN microalloying as introduction, this thesis deals with the study and application of VN microalloying.Interactive effects of Vanadium and Nitrogen plays an important role in improve performances of high strength low alloy steels (HSLAS). The forms of VN, VCN, FeVN are introduced into HSLAS for accurate content control of V and N. Taking dynamics as main tools, the article is dedicated to the analyze and discussion of the preparation of V and VC from vanadium oxide with carbon and hydrogen as reduction reagents, and the themodynamics conditions for the nitrification of the sequent productions (V and VC). New formulae for the calculations of AIC of components in ternary system the paper are established by uniform solution modeling on the basis of evaluations of geometric modeling for ternary system, which leads to the conclusion of the prominent feasibility of uniform solution modeling for analyze thermodynamic performance of ternary system. To expand the study, activity modeling for quaternary system of CaO-FeO-SiO₂-V₂O₃ of steel slag is deduced and main V recovery influencing factors is found in components of steel and slag, the slag ratio. The VCN content of solid solution form and chemical formula in vanadium microalloy steel is determined, and is verified in the production of the 3^rd class steel made of vanadium microalloy steel. The work will eventually facilitate practical production.