Construction Net

Ereğli Iron and Steel Works Turkish Co. (ERDEMİR)

Turkis Standards Institute

İstaş Construction Industry and Trading Co. Inc.

Metalprices.com

London Metal Exchange

American Iron and Steel Institute -> Pipes

Steel.com

Worldsteel.org

Steel Info Agency

DIN Standartları (DIN Deutsches Institut für Normung e.V.)

Steel Database

Trade Steel Online

Steel - Link