  The combination of the final version of the RAVE spectroscopic survey data
release 6 with radial velocities and astrometry from Gaia DR2 allows us to
identify and create a catalog of single lined binary star candidates (SB1),
their inferred orbital parameters, and to inspect possible double lined binary
stars (SB2).
  A probability function for the detection of radial velocity (RV) variations
is used for identifying SB1 candidates. The estimation of orbital parameters
for main sequence dwarfs is performed by matching the measured RVs with
theoretical velocity curves sampling the orbital parameter space. The method is
verified by studying a mock sample from the SB9 catalogue. Studying the
boxiness and asymmetry of the spectral lines allows us to identify possible SB2
candidates, while matching their spectra to a synthetic library indicates
probable properties of their components.
  From the RAVE catalog we select 37,664 stars with multiple RV measurements
and identify 3838 stars as SB1 candidates. Joining RAVE and Gaia DR2 yields
450,646 stars with RVs measured by both surveys and 27,716 of them turn out to
be SB1 candidates, which is an increase by an order of magnitude over previous
studies. For main sequence dwarf candidates we calculate their most probable
orbital parameters: orbital periods are not longer than a few years and primary
components have masses similar to the Solar mass. All our results are available
via Vizier/CDS.
