Process for producing ultra-low-carbon steel strip or sheet, said process comprising: - producing a vacuum-degassed steel melt in a steelmaking step comprising a ladle treatment comprising, by weight, ∘ at most 0.003% carbon, ∘ at most 0.004% nitrogen, ∘ at most 0.20% phosphorus, ∘ at most 0.020% sulphur, ∘ 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 in a suitable form to the melt to bind oxygen wherein the target oxygen activity or dissolved oxygen content of the melt at the end of the ladle treatment is at most 80 ppm; - 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 0.003% carbon, ∘ between 0.05 and 0.35% manganese, ∘ at most 0.004% nitrogen, ∘ at most 0.025% phosphorus, ∘ at most 0.020% sulphur, ∘ at most 40 ppm B, ∘ at most 0.005% titanium, ∘ at most 0.005% niobium, ∘ at most 0.005% zirconium, ∘ at most 0.005% vanadium, ∘ a total amount of the elements copper, nickel, chromium, tin and molybdenum of at most 0.10%, ∘ at most 0.002% of acid soluble aluminium, ∘ at most 0.004% silicon, ∘ a total oxygen content of at most 120 ppm, ∘ and balance iron and inevitable impurities. - producing a vacuum-degassed steel melt in a steelmaking step comprising a ladle treatment comprising, by weight, ∘ at most 0.003% carbon, ∘ at most 0.004% nitrogen, ∘ at most 0.20% phosphorus, ∘ at most 0.020% sulphur, ∘ and balance iron and inevitable impurities, ∘ at most 0.003% carbon, ∘ at most 0.004% nitrogen, ∘ at most 0.20% phosphorus, ∘ at most 0.020% sulphur, ∘ 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 in a suitable form to the melt to bind oxygen wherein the target oxygen activity or dissolved oxygen content of the melt at the end of the ladle treatment is at most 80 ppm; - 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 0.003% carbon, ∘ between 0.05 and 0.35% manganese, ∘ at most 0.004% nitrogen, ∘ at most 0.025% phosphorus, ∘ at most 0.020% sulphur, ∘ at most 40 ppm B, ∘ at most 0.005% titanium, ∘ at most 0.005% niobium, ∘ at most 0.005% zirconium, ∘ at most 0.005% vanadium, ∘ a total amount of the elements copper, nickel, chromium, tin and molybdenum of at most 0.10%, ∘ at most 0.002% of acid soluble aluminium, ∘ at most 0.004% silicon, ∘ a total oxygen content of at most 120 ppm, ∘ and balance iron and inevitable impurities. ∘ at most 0.003% carbon, ∘ between 0.05 and 0.35% manganese, ∘ at most 0.004% nitrogen, ∘ at most 0.025% phosphorus, ∘ at most 0.020% sulphur, ∘ at most 40 ppm B, ∘ at most 0.005% titanium, ∘ at most 0.005% niobium, ∘ at most 0.005% zirconium, ∘ at most 0.005% vanadium, ∘ a total amount of the elements copper, nickel, chromium, tin and molybdenum of at most 0.10%, ∘ at most 0.002% of acid soluble aluminium, ∘ at most 0.004% silicon, ∘ a total oxygen content of at most 120 ppm, ∘ and balance iron and inevitable impurities.