Process for producing a high strength steel said process comprising: - producing a vacuum-degassed steel melt in a steelmaking step comprising a ladle treatment comprising, by weight, ∘ at most 0.02% carbon, ∘ at most 0.003% silicon ∘ at most 0.010% nitrogen, ∘ at most 0.10% phosphorus, ∘ at most 0.020% sulphur, ∘ at least 0.15% and at most 4% manganese, ∘ at most 0.0045% boron, ∘ at most 0.03% titanium, ∘ at most 0.1% niobium, ∘ at most 0.2% vanadium, ∘ at most 3% chromium, ∘ at most 6% nickel, ∘ at most 1.5% molybdenum, ∘ at most 0.005% calcium, ∘ at most 0.006% zirconium, ∘ at most 0.005% barium, ∘ at most 0.005% strontium, ∘ at most 0.05% in total of rare earth elements, such as cerium, ∘ and balance iron and inevitable impurities, - wherein a target oxygen content of the melt at the end of the ladle treatment of the melt is obtained by measuring the actual oxygen content of the melt followed by adding a suitable amount of aluminium and/or zirconium in a suitable form to the melt to bind oxygen wherein the target oxygen content of the melt at the end of the ladle treatment is at most 100 ppm; - adding a second deoxidiser, after the oxygen activity at the end the ladle treatment of at most 100 ppm is reached, to create fine particles and to bring down the dissolved oxygen in the steel in the ladle to 10 ppm or lower, wherein the second deoxidiser is one or more of Zr, Ca, Ba, Sr, Ti, Cr and Si; - casting the steel thus produced in a continuous casting process to form a slab or strip; - wherein said process provides a slab, strip or sheet of ultra-low-carbon steel comprising at most 0.002% of acid soluble aluminium and at most 0.004% silicon and a total oxygen content of at most 150 ppm. - producing a vacuum-degassed steel melt in a steelmaking step comprising a ladle treatment comprising, by weight, ∘ at most 0.02% carbon, ∘ at most 0.003% silicon ∘ at most 0.010% nitrogen, ∘ at most 0.10% phosphorus, ∘ at most 0.020% sulphur, ∘ at least 0.15% and at most 4% manganese, ∘ at most 0.0045% boron, ∘ at most 0.03% titanium, ∘ at most 0.1% niobium, ∘ at most 0.2% vanadium, ∘ at most 3% chromium, ∘ at most 6% nickel, ∘ at most 1.5% molybdenum, ∘ at most 0.005% calcium, ∘ at most 0.006% zirconium, ∘ at most 0.005% barium, ∘ at most 0.005% strontium, ∘ at most 0.05% in total of rare earth elements, such as cerium, ∘ and balance iron and inevitable impurities, ∘ at most 0.02% carbon, ∘ at most 0.003% silicon ∘ at most 0.010% nitrogen, ∘ at most 0.10% phosphorus, ∘ at most 0.020% sulphur, ∘ at least 0.15% and at most 4% manganese, ∘ at most 0.0045% boron, ∘ at most 0.03% titanium, ∘ at most 0.1% niobium, ∘ at most 0.2% vanadium, ∘ at most 3% chromium, ∘ at most 6% nickel, ∘ at most 1.5% molybdenum, ∘ at most 0.005% calcium, ∘ at most 0.006% zirconium, ∘ at most 0.005% barium, ∘ at most 0.005% strontium, ∘ at most 0.05% in total of rare earth elements, such as cerium, ∘ and balance iron and inevitable impurities, - wherein a target oxygen content of the melt at the end of the ladle treatment of the melt is obtained by measuring the actual oxygen content of the melt followed by adding a suitable amount of aluminium and/or zirconium in a suitable form to the melt to bind oxygen wherein the target oxygen content of the melt at the end of the ladle treatment is at most 100 ppm; - adding a second deoxidiser, after the oxygen activity at the end the ladle treatment of at most 100 ppm is reached, to create fine particles and to bring down the dissolved oxygen in the steel in the ladle to 10 ppm or lower, wherein the second deoxidiser is one or more of Zr, Ca, Ba, Sr, Ti, Cr and Si; - casting the steel thus produced in a continuous casting process to form a slab or strip; - wherein said process provides a slab, strip or sheet of ultra-low-carbon steel comprising at most 0.002% of acid soluble aluminium and at most 0.004% silicon and a total oxygen content of at most 150 ppm.