The use of oxygen technologies within the steel industry has become increasingly important. During the last decades increased throughput capacity and lowered average cost have been the driving forces, however, today the positive impact on energy savings and reduced emissions have come into the focal point, a fact that seems to be even further pronounced in the future. The article describes how the oxygen technologies can contribute to an increased energy efficiency in the electric arc furnace process, how flameless oxygen combustion reduces fuel consumption and CO₂ emission in melting and heating operations, and how low calorific gases, for example blast furnace top gas and converter gas, can be effectively used to further improve the overall energy efficiency, reduce CO₂ emission, and reduce costs.