Manufacture of spring steel wire, prestressing steel and special steel wires in Cologne
DWK Drahtwerk Köln GmbH
Cologne · 51063New on Amplifa
About DWK Drahtwerk Köln
DWK Drahtwerk Köln GmbH produces technically sophisticated steel wires in Cologne-Mülheim, with a company history dating back to 1873. The product range comprises patented-drawn and quenched-and-tempered spring steel wire made from unalloyed C steels as well as SiCr- and SiCrV-alloyed steels, prestressing steel wire and 7-wire prestressing strands for construction, and special steel wires such as rope wires, cable armouring wires and wires for stamped and bent parts. Manufacturing includes wire drawing with tolerances of ±0.020 to ±0.050 mm, patenting (air and in-line patenting), hardening and tempering, and surface finishing by galvanizing and ZnAl coating. In the drawing process, an in-line crack test is performed by eddy current over the entire wire length. The company belongs to the Saarstahl Group and supplies, among others, the automotive industry, the construction industry, mechanical engineering as well as the rope and cable industry. Deliveries are made in coils, rings, bars and steel spools in various packaging formats.
- Site
- Köln
- Processes
- Spring steel wire - technical spring steel wire (patented-drawn), Spring steel wire - quenched and tempered (drawn surface, also in-line crack tested), Wire drawing (drawing in the drawing process with in-line crack testing), Patenting (air patented Stelmor / in-line patented isothermal), Hardening and tempering, Galvanizing (surface finishing Zn), ZnAl coating (surface finishing), In-line crack testing (in the drawing process, eddy-current testing over the entire length)
- Materials
- Unalloyed spring steel wire (C steel), 54SiCr6, 60SiCrV6, 65SiCrV6, Prestressing steel wire/strand, Unalloyed spring steel wire (VG 01-N), Patenting (Stelmor / isothermal), Hardening and tempering
- Certificates
- ISO 9001:2015, ISO 14001:2015, ISO 50001:2018, ISO 9001, ISO 14001, ISO 50001
- Founded
- 1873
- Industries
- Automotive industry, Construction industry, Mechanical engineering, Rope and cable industry, Precision mechanics, Stamped and bent parts
- 01
Rolled wire feedstock (Saarstahl Group)
- 02
Patenting
- 03
Wire drawing with in-line crack testing
- 04
Hardening and tempering
- 05
Surface finishing (Zn, ZnAl)
- 06
Packaging and shipping logistics
Materials and Processes
Unalloyed spring steel wire (VG 01-N)
C steel with 0,60–0,80 % C for patented-drawn and quenched-and-tempered spring steel wire.
54SiCr6
SiCr-alloyed spring steel wire in the normal-strength to super-high-strength range, also in-line crack tested.
60SiCrV6
SiCrV-alloyed steel for extra-high-strength quenched-and-tempered spring steel wires.
65SiCrV6
SiCrV-alloyed steel for super-high-strength spring steel wires.
Patenting (Stelmor / isothermal)
Air patenting or in-line patenting with isothermal transformation in the pearlite stage for microstructure modification.
Hardening and tempering
Heat treatment for spring steel wire made from unalloyed and alloyed steels.
Galvanizing
Corrosion protection for spring and rope wires up to 6,00 mm and prestressing steel wire up to 7,0 mm.
ZnAl coating
Surface finishing for corrosion-protected wires.
Locations
Cologne
DEHeadquarters and production plant
- Materials
- Steel
Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Spring steel wire - technical spring steel wire (patented-drawn)Forming | – | – | – | – | unalloyed steels |
| Spring steel wire - quenched and tempered (drawn surface, also in-line crack tested)Forming | – | – | – | – | unalloyed steels, alloyed steels (54SiCr6, 60SiCrV6, 65SiCrV6) |
| Wire drawing (drawing in the drawing process with in-line crack testing)Forming | ±0,020 to ±0,050 mm (depending on diameter) | – | – | – | steel |
| Patenting (air patented Stelmor / in-line patented isothermal)Heat treatment | – | – | – | – | unalloyed steels |
| Hardening and temperingHeat treatment | – | – | – | – | unalloyed and alloyed steels |
| Galvanizing (surface finishing Zn)Surface | – | – | – | – | steel |
| ZnAl coating (surface finishing)Surface | – | – | – | – | steel |
| In-line crack testing (in the drawing process, eddy-current testing over the entire length)Testing | – | – | – | – | steel |
| Manufacture of prestressing strands (7-wire)Forming | – | – | 2,0 t (coil) – 4,0 t (coil); approx. 18 t (steel spool) | – | steel |
| Manufacture of prestressing steel wire (smooth/profiled, also galvanized up to 7,0 mm)Forming | – | max. 2.600 mm (threaded bars), max. | 1.250 kg (rings) – 2.500 kg (rings) | – | steel |
| Manufacture of rope wires (high-strength)Forming | – | – | – | – | steel |
| Manufacture of cable armouring wires (round wires)Forming | – | – | – | – | steel |
| Manufacture of wires for stamped and bent parts (round and flat cross-sections)Forming | – | – | – | – | steel |
Additional services
Quality
The processes are governed by a process-oriented quality management system in accordance with ISO 9001:2015; quality-relevant characteristics are continuously monitored on site and in the quality department. The wire surface is inspected during the drawing process by eddy-current in-line crack testing over the entire length.
| Evidence | Cologne |
|---|---|
| ISO 9001 | |
| ISO 14001 | |
| ISO 50001 |
History
- 1873
Foundation stone laid by Felten & Guilleaume for the construction of a factory for wire production in Cologne-Mülheim.
- 1912
Felten & Guilleaume acquires all shares of the jointly founded rolling mill (Böcking) to secure feedstock.
- 1920
Agreement with the steel group ARBED on the supply of raw material (wire rod).
- 1968
ARBED takes over the iron and steel division of Felten & Guilleaume; the Cologne plant trades as Felten & Guilleaume Carlswerk Eisen und Stahl GmbH.
- 1972
Renamed ARBED-F&G Drahtwerke Köln GmbH.
- 1979
Renamed TrefilARBED Drahtwerk Köln GmbH.
- 1984
Change of ownership of the Cologne plant from ARBED to SAARSTAHL AG.
- 1993
Renamed TrefilEUROPE Deutschland GmbH; insolvency petition filed following the insolvency of SAARSTAHL AG.
- 1994
Foundation of the successor company TrefilEUROPE Drahtwerk Köln GmbH as a 100% subsidiary of SAARSTAHL Beteiligungsgesellschaft mbH.
- 1995
Renamed DWK Drahtwerk Köln GmbH.