ABS - American Bureau of Shipping

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

BV - Bureau Veritas

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

Class NK - Nippon Kaiji Kyokai

Witten - Ingots and forgings[EN]

CCS China Classification Society

Witten - Semi-finished products (ingot billets / billets)[EN]
Witten - Bars (rolled)[EN]
Witten / Krefeld - Bars (forged)[EN]
Witten / Krefeld - Semi-finished products (forged)[EN]

DNV

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

LR - Lloyd's Register

Siegen - Steelmaking and bars [EN]
Witten - Steelmaking, Semi-Finished Products and bars  [EN]
Witten - Forgings [EN]
Krefeld - Forgings​​​​​​​[EN]

KRS - Korean Register of Shipping

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

RINA - Registro Italiano Navale

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