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The controlled rolling of structural flat micro alloyed steels aims basically to refine the austenitic microstructure at the end of rolling, which fineness is by the final ferritic structure, increasing both mechanical strength and toughness. The present work shows the correlations between mechanical properties of API 5L-X70 steel plates and the strain degree applied during the finishing stage of controlled rolling. It was observed that heavier thickness reductions during the finishing stage has little effect over mechanical strength, but significantly improves toughness, reflecting the refining effect over the microstructural grain size.

ESTUDO DAS PROPRIEDADES MECÂNICAS DO AÇO API X70 PRODUZIDO POR LAMINAÇÃO CONTROLADA