Method for the manufacture of a galvannealed steel sheet comprising: A. The provision of a steel sheet having the following chemical composition in weight percent: 0.05 ≤ C ≤ 0.20%, 1.5 ≤ Mn ≤ 3.0%, 0.10 ≤ Si ≤ 0.45%, 0.10 ≤ Cr ≤ 0.60%, Al ≤ 0.20%, V < 0.005% and on a purely optional basis, one or more elements such as P < 0.04%, Nb ≤ 0.05 %, B ≤ 0.003%, Mo ≤ 0.20%, Ni ≤ 0.1%, Ti ≤ 0.06%, S ≤ 0.01% Cu ≤ 0.1%, Co ≤ 0.1%, N ≤ 0.01%, the remainder of the composition being made of iron and inevitable impurities resulting from the elaboration, B. The recrystallization annealing of said steel sheet in a full radiant tube furnace comprising a heating section, a soaking section, a cooling section, optionally an equalizing section comprising the sub-following steps: i. the heating of said steel sheet from ambient temperature to a temperature T1 between 700 and 900°C in the heating section having an atmosphere A1 comprising from 0.1 to 15% by volume of H 2 and an inert gas whose a dew point DP1 is between -18°C and +8°C, ii. the soaking of the steel sheet from T1 to a temperature T2 between 700 and 900°C in the soaking section having an atmosphere A2 identical to A1 with a dew point DP2 equal to DP1, iii. the cooling of the steel sheet from T2 to T3 between 400 and 700°C in the cooling section having an atmosphere A3 comprising from 1 to 30%H 2 by volume and an inert gas whose a dew point DP3 is below or equal to -30°C, iv. optionally, the equalizing of the steel sheet from a temperature T3 to a temperature T4 between 400 and 700°C in the equalizing section having an atmosphere A4 comprising from 1 to 30%H 2 by volume and an inert gas whose a dew point DP4 is below or equal to -30°C, C. The hot-dip galvanizing of the annealed steel sheet in a zinc bath and D. An alloying treatment performed at a temperature T5 between 460 and 600°C during a time t5 between 1 and 45 seconds. A. The provision of a steel sheet having the following chemical composition in weight percent: 0.05 ≤ C ≤ 0.20%, 1.5 ≤ Mn ≤ 3.0%, 0.10 ≤ Si ≤ 0.45%, 0.10 ≤ Cr ≤ 0.60%, Al ≤ 0.20%, V < 0.005% and on a purely optional basis, one or more elements such as P < 0.04%, Nb ≤ 0.05 %, B ≤ 0.003%, Mo ≤ 0.20%, Ni ≤ 0.1%, Ti ≤ 0.06%, S ≤ 0.01% Cu ≤ 0.1%, Co ≤ 0.1%, N ≤ 0.01%, the remainder of the composition being made of iron and inevitable impurities resulting from the elaboration, 0.05 ≤ C ≤ 0.20%, 1.5 ≤ Mn ≤ 3.0%, 0.10 ≤ Si ≤ 0.45%, 0.10 ≤ Cr ≤ 0.60%, Al ≤ 0.20%, V < 0.005% P < 0.04%, Nb ≤ 0.05 %, B ≤ 0.003%, Mo ≤ 0.20%, Ni ≤ 0.1%, Ti ≤ 0.06%, S ≤ 0.01% Cu ≤ 0.1%, Co ≤ 0.1%, N ≤ 0.01%, B. The recrystallization annealing of said steel sheet in a full radiant tube furnace comprising a heating section, a soaking section, a cooling section, optionally an equalizing section comprising the sub-following steps: i. the heating of said steel sheet from ambient temperature to a temperature T1 between 700 and 900°C in the heating section having an atmosphere A1 comprising from 0.1 to 15% by volume of H 2 and an inert gas whose a dew point DP1 is between -18°C and +8°C, ii. the soaking of the steel sheet from T1 to a temperature T2 between 700 and 900°C in the soaking section having an atmosphere A2 identical to A1 with a dew point DP2 equal to DP1, iii. the cooling of the steel sheet from T2 to T3 between 400 and 700°C in the cooling section having an atmosphere A3 comprising from 1 to 30%H 2 by volume and an inert gas whose a dew point DP3 is below or equal to -30°C, iv. optionally, the equalizing of the steel sheet from a temperature T3 to a temperature T4 between 400 and 700°C in the equalizing section having an atmosphere A4 comprising from 1 to 30%H 2 by volume and an inert gas whose a dew point DP4 is below or equal to -30°C, i. the heating of said steel sheet from ambient temperature to a temperature T1 between 700 and 900°C in the heating section having an atmosphere A1 comprising from 0.1 to 15% by volume of H 2 and an inert gas whose a dew point DP1 is between -18°C and +8°C, ii. the soaking of the steel sheet from T1 to a temperature T2 between 700 and 900°C in the soaking section having an atmosphere A2 identical to A1 with a dew point DP2 equal to DP1, iii. the cooling of the steel sheet from T2 to T3 between 400 and 700°C in the cooling section having an atmosphere A3 comprising from 1 to 30%H 2 by volume and an inert gas whose a dew point DP3 is below or equal to -30°C, iv. optionally, the equalizing of the steel sheet from a temperature T3 to a temperature T4 between 400 and 700°C in the equalizing section having an atmosphere A4 comprising from 1 to 30%H 2 by volume and an inert gas whose a dew point DP4 is below or equal to -30°C, C. The hot-dip galvanizing of the annealed steel sheet in a zinc bath and D. An alloying treatment performed at a temperature T5 between 460 and 600°C during a time t5 between 1 and 45 seconds.