In July 2001, Dunkirk blast furnace 4 achieved a 13 years and 9 months long campaign with a 41.7 millions tons hot metal cumulative output. The relining works had been scheduled within a 65 to 75 days period for a total cost over 150 millions Euros. The objectives of the next campaign are : a daily production over 10,800 tons, a blast furnace life over 20 years without any intermediate repair, a significant improvement of the working conditions and a major reduction of the environmental impact.