ABS - American Bureau of Shipping

Krefeld - Forging Facility and Process Approval[GB]
Witten - Foundry Facility and Process Approval[GB]
Witten - Rolled bars-Machinery, Facility and Process Approval[GB]
Witten - Forging Facility and Process Approval[GB]
Siegen - Foundry Facility and Process Approval[GB]
Siegen - Rolled bars-Machinery, Facility and Process Approval[GB]

BV - Bureau Veritas

Witten - Steelmaking, rolling and forgings[GB]
Krefeld - forgings[GB]
Siegen - steelmaking and rolling[GB]

Class NK - Nippon Kaiji Kyokai

Witten - Ingots and forgings[GB]

DNV_GL - Det Norske Veritas_Germanischer Lloyd

Witten - Steel forgings (incl. HY-80 & HY-100) [GB]
Witten - Steelmaking & rolled steel products (inkl. HY-80, HY-100) [GB]
Krefeld - Steel forgings[GB]
Siegen - Steelmaking & rolled steel products[GB]
Hagen - Rolled steel products[GB]
Witten - OS-E302 Offshore Mooring Chain [Interim Confirmation][GB]
Krefeld - OS-E302 Offshore Mooring Chain [Interim Confirmation][GB]

LR - Lloyd's Register

Siegen - Steelmaking and bars [Interim Confirmation][GB]
Witten - Steelmaking, Semi-Finished Products and bars[GB]
Witten - Forgings[GB]
Krefeld - Forgings[GB]

KRS - Korean Register of Shipping

Witten - stainless steels - steelmaking, rolling and forgings[GB]
Krefeld - stainless steels - forgings[GB]
Siegen - steinless steels - steelmaking, rolling[GB]

RINA - Registro Italiano Navale

Witten, Krefeld - steelmaking, rolling and forgings[GB]