You can import STEP files as 3ds Max Body Objects.
Standard for the Exchange of Product Data (STEP) is an ISO standard exchange format that multiple programs can recognize. It is used for transferring graphics data between CAD/CAM systems.
3ds Max does not export the STEP format.
Support for the STEP format is provided by Autodesk DirectConnect.
There are no import options. When you import a STEP file, 3ds Max displays a progress dialog and a progress bar. When import is complete, the Body Objects appear in 3ds Max viewports.