An AISI 1137 type medium carbon steel was studied by means of scanning electron microscopy and Mössbauer spectroscopy. This steel in as received state at room temperature was ferritic. Different heat treatments on related steel exhibited different microstructures such as pearlite and bainite. Also magnetism of these product phases was determined as 32·7 T and 32·6 T relatively where ferromagnetism of ferritic phase in as received state was 33·05 T. Mössbauer parameters such as isomer shifts and % volumes were also determined before and after transformations. © Indian Academy of Sciences.