Six Sigma for production process (Steel Industry)

Hello All!
I’m looking for a good examples of 6Sigma implementation  in steel industry (metal, copper, alloy, etc.) in production process.
For example Phelps Dodge Quest for Zero is based on six sigma methodology but they do not give to many information about this program on their website. I would be very grateful if you give me some links to good articles.
Regards,
Pete