  We study the QCD equation of state and the chiral condensate using the hadron
resonance gas model with repulsive mean-field interactions. We find that the
repulsive interactions improve the agreement with the lattice results on the
derivatives of the pressure with respect to the baryon chemical potential up to
eighth order. From the temperature dependence of the chiral condensate we
estimate the crossover temperature as a function of baryon chemical potential,
$T_{pc}(\mu_B)$. We find that the chiral crossover line starts to deviate
significantly from the chemical freeze-out line already for $\mu_B>400$ MeV.
Furthermore, we find that the chiral pseudocritical line can be parametrized as
$T_{pc}(\mu_B)/T_{pc}(0)=1-\kappa_2 (\mu_B/T_{pc} (0))^2-\kappa_4 (\mu_B/T_{pc}
(0))^4$ with $\kappa_2=0.0150(2)$ and $\kappa_4=3.1(6) \times 10^{-5}$, which
are in agreement with lattice QCD results for small values of $\mu_B$. For the
first time we find a tiny but non-zero value of $\kappa_4$ in our study.
