Method for heat treating a manganese steel product whose alloy comprises: - a carbon fraction between 0.09 and 0.15 wt.%, and - a manganese fraction (Mn) in the range of 3.5 wt.% ≤ Mn ≤ 4.9 wt.%, - a silicium fraction (Si), - an aluminium fraction (Al), and - a chromium fraction (Cr), - wherein the following relationship between the silicium fraction (Si), aluminium fraction (Al) and chromium fraction (Cr) holds: 0.3 wt.% ≤ Si + Al + Cr ≤ 3 wt.%, and - iron (Fe) as a basic element and unavoidable impurities; wherein the method comprises the following steps: - performing a first annealing process (S4.1) with the following substeps ∘ heating the steel product to a first holding temperature, which lies above 780°C, ∘ holding the steel product during a first time period (Δ1) at the first holding temperature, ∘ cooling the steel product, - performing a second annealing process (S4.2) which is carried out subsequently to the first annealing process (S4.1), with the following substeps ∘ heating the steel product to a holding temperature, which lies above 630°C and below 660°C, ∘ holding the steel product during a second time period (Δ2) at the holding temperature, ∘ cooling the steel product, wherein the cooling (A1; A2) of the steel product during the first annealing process (S4.1) and during the second annealing process (S4.2) is carried out at a cooling rate which lies between 25 Kelvin/second and 200 Kelvin/second, and wherein the method is carried out after a hot rolling and a cold rolling step, and wherein the heat treated manganese steel product comprises fractions of bainite microstructure. - a carbon fraction between 0.09 and 0.15 wt.%, and - a manganese fraction (Mn) in the range of 3.5 wt.% ≤ Mn ≤ 4.9 wt.%, - a silicium fraction (Si), - an aluminium fraction (Al), and - a chromium fraction (Cr), - wherein the following relationship between the silicium fraction (Si), aluminium fraction (Al) and chromium fraction (Cr) holds: 0.3 wt.% ≤ Si + Al + Cr ≤ 3 wt.%, and - iron (Fe) as a basic element and unavoidable impurities; - performing a first annealing process (S4.1) with the following substeps ∘ heating the steel product to a first holding temperature, which lies above 780°C, ∘ holding the steel product during a first time period (Δ1) at the first holding temperature, ∘ cooling the steel product, ∘ heating the steel product to a first holding temperature, which lies above 780°C, ∘ holding the steel product during a first time period (Δ1) at the first holding temperature, ∘ cooling the steel product, - performing a second annealing process (S4.2) which is carried out subsequently to the first annealing process (S4.1), with the following substeps ∘ heating the steel product to a holding temperature, which lies above 630°C and below 660°C, ∘ holding the steel product during a second time period (Δ2) at the holding temperature, ∘ cooling the steel product, wherein the cooling (A1; A2) of the steel product during the first annealing process (S4.1) and during the second annealing process (S4.2) is carried out at a cooling rate which lies between 25 Kelvin/second and 200 Kelvin/second, and ∘ heating the steel product to a holding temperature, which lies above 630°C and below 660°C, ∘ holding the steel product during a second time period (Δ2) at the holding temperature, ∘ cooling the steel product,