It should be possible to convert CAD data saved in ISO STEP product data files (.stp, .step) as vector SVG files. This can probably done in some CAD software that supports this function, only vector data from the CAD file will be exported. You may also want to check STP to SVG conversion.
Convert ISO-10303 STEP product data to XML based scalable vector graphics format.
We found one software available in the database for this conversion.
Multiplatform software - convert step to svg on any platform
An open source multiplatform 3D CAD/MCAD/CAx/CAE/PLM modeler
Convert from step file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.