This report is concerned with the representation of temperature profiles for gas and solid in temperature‐enthalpy‐diagrams for the example of the blast‐furnace process. Of particular interest is the point at which the gas and solid temperatures approach each other the most. For this, the temperature profiles for gas and solid are required, which can both be represented as a function of the specific enthalpy of the solid. With such diagrams we are able to judge the effects on process changes with reference to the position and the level of the minimum temperature difference between gas and solid, and to the level of the top‐gas temperature and the caloric temperature dominating in front of the air‐blast tuyères. In this context the influence of the coke ratio, of the furnace blast temperature, of the oxygen enrichment of the furnace blast, of the specific heat losses, as well as of the injected replacement fuels was studied for the example of pulverized coal and heavy oil. As a rule, the minimum temperature difference is to be found at the beginning of the smelting of the burden. Depending on the change of the process quantities the temperature difference can also arise at the top, as for example during oxygen enrichment.