ma to step conversion is typically searched by users that for some reason struggle with export of Maya files to STEP format. It seems that Maya supports export to STP / STEP format only for objects with NURBS data. But that might be case of old version of Maya and latest versions of the tool should have no issues with export to STEP format.
Considering the limited support for Maya files in 3rd party software, it is more than likely that this export is doable only with Maya.
Updated: January 5, 2024