Cleveland Strip, Columbus, Delta, Middletown, Monroe, Porter, Spartan, Taylor, TWB (Antioch, Canada, Canton, Glasgow, Monroe, Valley City), WS Bowling Green, Worthington Samuel Coil Processing (Cleveland, Twinsburg) - ISO-14001
Cleveland Strip, Columbus, Delta, Middletown, Monroe, Porter, Spartan, Taylor, TWB (Antioch, Canada, Glasgow, Monroe), WS Bowling Green-ISO-45001
Worthington Steel Bowling Green-ISO-9001
Worthington Steel Columbus-ISO-9001
Worthington Steel Rome, LLC (Worthington Steel Outside Processing)-ISO-9001
Worthington Samuel Coil Processing Twinsburg-ISO-9001
Tempel Chicago-ISO-14001
Tempel China-ISO-14001
Tempel China-ISO-45001
Tempel India-ISO-14001
Tempel India-ISO-45001
Tempel Mexico-ISO-14001
Tempel Canada-ISO-9001
Tempel Nagold-ISO-50001
Tempel Nagold-ISO-9001
Tempel Nagold-ISO-16949
