3D models and data saved in STEP product files (.stp, .step) are usually well-supported in modern CAD / 3D modeling tools so you should have no problem with its import. You will just need to use software that supports formats from CATIA, that is if you do not have access to CATIA itself. Some viable alternatives for step to model conversion are listed below.
Home > Search converters: step to model
Conversion of step file format to model file format beta
Search for step to model converter or software able to handle these file types.
Convert ISO-10303 STEP product data file to CATIA V4 model.
We have found 4 software records in our database eligible for .step to .model file format conversion.
Microsoft Windows software 
- convert step to model on Windows
CATIA
A PLM/CAD/CAM/CAE software suite
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from step file | No | Yes | Yes | step editor | Yes | No | Yes | No |
to model file | No | Yes | Yes | model editor | Yes | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned step to model. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Solid Edge
A feature rich 3D CAD software by Siemens
EnSuite
A CAD visualizaton, analyzation and translating system
On-line services software 
- convert step to model on web
Online CAD converter
A commercial online CAD converter
Additional links: Open step file, Open model file
STEP
Files with step extension are quite often found as 3D model / part files saved in STEP (Standard for the Exchange of Product Data) format.
MODEL
Files with model extension can be often found as 3D models or parts prepared and saved using the CATIA V4 CAD application.
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