A Steel Dynamics worker watches over the automated zinc dipping process, where raw steel is galvanized. At left, a treated coil is rolled out and painted beige for use in construction. (Annie Ropeik/IPB News)

A Steel Dynamics worker watches over the automated zinc dipping process, where raw steel is galvanized. (Annie Ropeik/IPB News)

A treated coil is rolled out and painted beige for use in construction. (Annie Ropeik/IPB News)