Abstract: The invention concerns a method for manufacturing a worked weldable, low temperature ferritic steel consisting of0.015 to 0.08% C0.1 to 0.5% Si0.3 to 0.6% Mn<0.015% P<0.015% S4 to 7% Ni0 to 1.5% Cuthe rest iron and unavoidable impurities in normal amounts which is characterized in that the steel has added to it 0.15 to 0.25% vanadian and 0.020 to 0.030% nitrogen; the steel being rolled and then cooled to room temperature and finally subjected to a one time normalizing. Such a steel is usable as work material for making construction part especially for the transport and storage of liquified natural gas and having at a temperature of -196.degree. C. a notch charpy impact value at longitudinal test samples of more than 42 J.