A new, open-access material data management tool has been developed and applied to bainitic steels. Microstructural characteristics of carbide-bearing and carbide-free bainite were investigated and digitalized. Microstructural investigations showed that in carbide-bearing steels, bainitic ferrite formed as primary phase, while cementite precipitated as secondary phase. In carbide-free bainite, retained austenite and martensite were introduced as secondary phases due to Silicon (Si) addition. The low solubility of Si in cementite hinders cementite precipitation. This enables carbon-diffusion from ferrite to austenite during phase-transformation, which results in stabilization of the austenite. The isothermal phase-transformation behaviour of both bainitic steels is examined via dilatometer experiments. Microstructures obtained from isothermal heat treatments are characterized. The metastable retained austenite in carbide-free bainite showed TRIP effect during deformation, which resulted in better mechanical properties. The experimental data processed in the self-developed intelligent digital Computational advanced research laboratory (idCarl), a web application based on the material description ontology Digital Material Twin. idCarl enables the material processing chain creation and adjustment. The experimental data of the materials is automatically connected in the database to the process steps by idCarl. The combination of experimental data and idCarl, is a new way for targeted material properties which can be monitored and predicted in the future.