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Open Clusters have long been used to study the chemo-dynamical evolution ofthe Galactic disk. This requires an homogeneously analysed sample covering awide range of ages and distances. In this aper we present the OCCASO seconddata release. This comprises a sample of high-resolution ($R>65,000$) and highsignal-to-noise spectra of 115 Red Clump stars in 18 Open Clusters. We deriveatmospheric parameters ($T_{\mathrm{eff}}$, $\log g$, $\xi$), and [Fe/H]abundances using two analysis techniques: equivalent widths and spectralsynthesis. A detailed comparison and a critical review of the results of thetwo methods are made. Both methods are carefully tested between them, with the\emph{Gaia} FGK Benchmark stars, and with an extensive sample of literaturevalues. We perform a membership study using radial velocities and the resultingabundances. Finally, we compare our results with a chemo-dynamical model of theMilky Way thin disk concluding that the oldest Open Clusters are consistentwith the models only when dynamical effects are taken into account.

OCCASO II. Physical parameters and Fe abundances of Red Clump stars in 18 Open Clusters