In order to cope with the global climate change, a remarkable reduction of worldwide CO2-emissions is necessary. To archive this target, the United Nations have agreed to cut the emission of climate-active gases by 80 % till 2050. The base of this number is the amount of emissions in 1990. These actions were negotiated in various treaties, like in the agreement of Paris. Also, the iron and steel industry is affected by these measures and therefore has launched plenty of research to find possibilities for the necessary reduction of CO2 emissions. As an outcome of several research works, four basic strategies can be named. The production of iron with coke/coal accompanied by a capture of the created CO2 (by CCS and CCU), an electrolysis of iron ore, production by utilizing of biomass and finally a reduction of iron ore with hydrogen. In this work the focus lays on the latter strategy. Firstly, a literature research to summarize the existing knowledge of application of hydrogen in blast furnace and a MIDREX plant has been done. Secondly, a FactSage model for a mass and energy balance has been created to evaluate the effects of the use of hydrogen in a MIDREX plant. With this model the maximum feasible input of pure hydrogen in the plant was investigated. As a result of the simulation, the function of the reformer can´t be guaranteed anymore at a hydrogen content of 39 % in the addition to the gas-cycle. The burning of hydrogen-rich gas is seen as another limit of reasonable hydrogen application, this is necessary at a content of 45 % hydrogen in the addition. The maximum capacity of the top gas scrubber is also reached at an addition of 45 % hydrogen. Furthermore, possible actions to expand the stated limits are described.