Risse + Wilke cold strip
| Risse + Wilke Kaltband GmbH & Co. KG
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| legal form | GmbH & Co. KG |
| founding | 1920 |
| Seat | Iserlohn |
| management | Kai Wilke, Jörg Lohölter |
| Number of employees | 350 |
| sales | 160 million euros |
| Branch | Cold strip, strip steel |
| Website | www.risse-wilke.de |
The Risse + Wilke cold strip GmbH & Co. KG is a German company for cold-rolled and cold-rolled strip steel . The company is medium-sized and is family-run in the third generation.
history
The start of production under the founding fathers Eduard Risse and Wilhelm Wilke sen. goes back to 1907. This year, the farmer Eduard Risse founded the Hohenlimburger Facondraht-Fabrik Risse & Co. company in the Elsey district . In 1919 Eduard Risse and the merchant Wilhelm Wilke acquired the former Camphausen site on Oeger Strasse and founded the Risse + Wilke company there at the beginning of 1920. Gradually, the wire production was switched to the rolling production of cold strip and strip steel. In 1924 Eduard Risse left the company, which from that point on was managed by Wilhelm Wilke alone. Wilhelm Wilke Sr. died in 1939.
After the Second World War , Wilhelm Wilke, the son of the company founder, joined the company and took over management at the age of 19. The essential basic investments were carried out under his leadership, particularly in the 1960s at the Oeger Strasse site in Hohenlimburg . After the death of Wilhelm Wilke in 1972, the management of the company was placed in the hands of Karl Halverscheid and Lore Wilke. In the 1970s and 1980s, investments were made in a four-high reversing stand as well as in further modernization and expansion measures in the heating and re-rolling area at the Hohenlimburg location.
The heirs of the company shares and sons of Wilhelm and Lore Wilke, Jens Wilke and Dr. Kai Wilke, joined the company in 1985 and 1989 respectively. In the 1990s, a series of investment, organizational and personnel measures created the basis for a secure further development of the company.
After taking over the majority stake in Hoesch Hohenlimburg's Iserlohner Kaltwalzwerk in 1998, the activities of Hohenlimburg Risse + Wilke GmbH & Co. KG were gradually transferred to Risse + Wilke Kaltband GmbH & Co. KG based in Iserlohn. The cold strip production in the Hohenlimburg plant was finally stopped at the end of 2003 and completely transferred to the Iserlohn plant. At the beginning of 2006 the remaining minority shares of Hoesch Hohenlimburg GmbH in Risse + Wilke Kaltband GmbH & Co. KG were taken over by the brothers Kai and Jens Wilke. In 2008, the previous managing director Jörg Lohölter also joined the company as a partner.
Production sites
Risse + Wilke is located with its two locations in the center of the European cold rolling industry in the Lennetal .
Iserlohn-Letmathe plant
The plant in Iserlohn- Letmathe on Stenglingser Weg, originally built by PW Lenzen in 1960, became the second at the beginning of 1998 as a joint venture under the name Risse + Wilke Kaltband GmbH & Co. KG by Risse + Wilke GmbH & Co. KG and Hoesch Hohenlimburg GmbH Risse + Wilke site installed. Gradually, the active business, employees and parts of the production facilities were transferred from the now smaller location in Hohenlimburg to this more modern and significantly larger plant. This process was finally completed in 2006 with the takeover of the remaining minority shares from Hoesch Hohenlimburg GmbH.
Hagen-Hohenlimburg plant
The company's main plant, founded in 1920, is located in Hagen- Hohenlimburg on Oeger Strasse and was decommissioned at the end of 2003 after the active business was completely transferred to the plant in Letmathe. Today, after the production facilities have been almost completely dismantled, the location is used to store and dispatch finished materials from the Letmath production facility. Only one re-rolling stand still produces selected cold strip grades there.
Products
Classic cold strip
Classic cold strip is suitable for stamping, drawing, stretching and deep-drawing purposes, where high demands are made on the forming properties, the surface finish and the tolerance accuracy. It is also characterized by a very homogeneous structure with little variation in the parameters and unsurpassed forming properties and can therefore be used in forming processes with high lifting speeds.
Packing tape
This special product is manufactured in a shortened production process and is a starting material for the manufacture of tempered steel packaging tapes.
Micro-alloyed cold strip
Micro-alloyed cold strip is suitable for the production of bent and drawn parts with increased or high yield strengths with high values for elongation at the same time.
Case hardening steel / special steel
Case-hardening steels are used to manufacture stamped parts that are simultaneously exposed to high wear and high impact loads (e.g. gear wheels). These grades are used for components whose surface layer is case-hardened, as they have a higher hardness in the surface layer than in the core. Nevertheless, case-hardened steels have very good formability in the LC version.
Structural steels are suitable for the production of stamped, bent and drawn parts for various applications. In addition, a low carbon equivalent allows this material to be welded well.
Key steels are used for the manufacture of keys. The advantage in production is that the material can be easily milled and embossed. In addition, comparatively long tool life can be achieved through chemical analysis.
The magnetic soft iron product is a special quality, which is characterized by a low coercive field strength , high induction and magnetic aging resistance.
Tempered steel
Quenched and tempered steels and boron-alloyed steels in cold-rolled design are two higher carbon steel types.
Quenched and tempered steels , alloyed and unalloyed, meet the high requirements for later use in different applications thanks to the following material and processing properties:
- high strength combined with good ductility
- uniform structure formation
- good formability in LC design
- up to 100% formation structure (GKZ) adjustable
- narrow range of mechanical-technological values
- as a special version with further optimized formability and fineblanking capability (VAUTEZETT steels)
- Can be tempered for higher strip strengths to improve wear resistance
The boron - alloyed cold-rolled steel strips also have good cold formability and, due to the addition of boron, increased material hardness. These grades are therefore particularly suitable for heavily formed finished parts that have to be tempered to improve the structural strength or wear resistance. Boron-alloyed grades can be tempered to high hardness values with good toughness at the same time. The low C equivalent allows good weldability .
Spring steel
Spring steels have a very diverse range of applications. They have a high elastic limit , a high elongation at break and necking at break, as well as very little edge decarburization.
Tempered steel strip
Quenched and tempered steel strips have the following properties:
- tightest strength and hardness tolerance ranges
- homogeneous structures result in uniform material properties
- lowest strip flatness in the tempered condition
- low and even residual stresses in the strip
- very good wear resistance
- metallic bright strip surfaces or annealed in color
- Martensitic and bainitic microstructure designs depending on the intended use
