The development of high strength hot rolled TRIP (Transformation induced plasticity)-aided steel sheetswith 780 MPa was carried out by taking into account the addition of Nb and Mo to 0.2C–1.5Si–1.5Mnmass% steel and coiling conditions after hot rolling. The results reveal that the addition of 0.05% Nb canattain higher elongation with higher strength compared with Nb-free steel. The obtained tensile strength inthis steel was higher than 780 MPa. The multiple addition of 0.2% Mo with 0.05% Nb results in higher TS(Tensile Strength) by the large amount of fine NbMoC precipitates than Nb containing steel without the deteriorationof TS–El (Elongation) balance under the possible hot rolling conditions. The good ductility in0.05% Nb containing steel was mainly obtained by large volume fraction and high carbon concentration ofretained austenite. In addition, finely dispersed retained austenite made some contribution to the improvementof ductility.

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