Oxygen blast furnace with CO 2 capture and storage at an integrated steel mill – Part II: Economic feasibility in comparison with conventional blast furnace highlighting sensitivities

•Oxygen blast furnace (OBF) with CCS would lead to large reductions in CO2 emissions.•Also OBF without CCS would decrease emissions due to decreased coke consumption.•OBF process would increase mills electricity and gas purchase.•Feasibility is extremely sensitive for market prices (e.g. coke, CO2, electricity).•Costs of “low CO2 steel” production are compared in different market situations.