What Kind of Metal is this???

[Murphy]

I've got this scrap metal laying around my place. Wanted to cash in on it but am unsure what kind of metal it is.

http://i226.photobucket.com/albums/dd233/aaronhuerta1983/100_0131.jpg

http://i226.photobucket.com/albums/dd233/aaronhuerta1983/100_0130.jpg

[ballhog]

Iron or steel. About 80% rust now.