Abstract
Production of hot rolled strips for oil and gas transport pipelines requires a fine and homogeneous microstructure and careful choice of chemical composition in order to meet strength, toughness, and weldability requirements. The current work is aimed to assess the feasibility of producing high strength hot rolled strips in a thin slab plant. The study was carried out using a metallurgical modelling system based on empirical equations describing austenite evolution, transformation and mechanical properties (UTS, 50% FATT). Using this approach, it is possible to study the effects of initial slab thickness, reduction ratio and chemical composition on the mechanical properties of strips in a thickness range of 10 to 20 mm. In this way, for each grade, the optimum rolling schedules, microstructures and chemical compositions could be obtained. Starting from this initial condition, the austenite evolution from the entrance of the first roughing stand, is simulated considering the following phenomena: • Recrystallization kinetics. • Recrystallized grain size. • Grain growth after recrystallization. • Strain induced precipitation of Nb(C, N).
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