- Arcelor Mittal, Spain
- Arcelor Mittal, Germany
- Arcelor Mittal, France
- Arcelor Mittal Bremen, Germany
- Arcelor Mittal Krakau, Poland
- CIM - Tech, USA
- Walter Brinkmann GmbH, Germany
- AE&E Inova GmbH, Germany
- AE&E AG, Austria
- Hitachi Power Europe GmbH, Germany
- MAN Ferrostaal, Germany
- SMB Wildau, Germany
- Satherm GmbH, Germany
- Stork Industry b.v., Netherlands
- Mehldau & Steinfath GmbH, Germany
- Pipeline Supplies, Australia
- China Steel, Taiwan
- SMS Mevac, Germany
- Saudi Iron Steel, Saudi Arabia
- Ensidesa Verina, Spain