Under the given description of what an alloy is, steel can not be regarded as such. I'll explain what category does steel fall under.
Music:
"Tranquility Base" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/
Images:
since the credits are to ridiculously long I have provided a sharable link to a text file with all the credit attributions for the required images
https://drive.google.com/open?id=0B9-n1L6wf2xzTDJRQzRITXBmS00
Green beetles channel: https://www.youtube.com/user/greenbeetlegear
Sites and references:
https://ehttps://en.wikipedia.org/wiki/Ferrite_(magnet)n.wikipedia.org/wiki/Ferrite_(iron)
https://en.wikipedia.org/wiki/Carbon
https://en.wikipedia.https://en.wikipedia.org/wiki/Ceramicorg/wiki/Cementite
https://en.wikipedia.org/wiki/Ceramic
https://en.wikipedia.org/wiki/Alloy
https://en.wikipedia.org/wiki/Steel
The Mössbauer spectroscopy of iron carbides : http://www.nature.com/articles/srep26184
