Drop forge for custom steel forgings, assemblies and forged valves from Warstein-Belecke.
Siepmann Werke GmbH & Co. KG
Warstein-BeleckeNew on Amplifa
About SIEPMANN-WERKE
Siepmann Werke GmbH & Co. KG is a family-owned company in the metalworking industry headquartered in Warstein-Belecke. The company develops, manufactures and markets custom product solutions in steel, with core competencies in drop forging and hot extrusion, machining, welding technology, heat treatment, finishing, as well as toolmaking and assembly of complete units. Products include forged hubs, gearbox components, planetary carriers for conveying technology, wheel bodies for rail transport, brake caliper carriers for commercial vehicles and forged engine pistons. Customers come from power plant and energy technology, wind energy, construction machinery, mining and raw material extraction, rail transport, automotive, the maritime industry and valve technology. The subsidiary PERSTA Stahl-Armaturen is an internationally established brand for forged industrial valves. With around 450 employees and annual revenue of approximately 85 million euros, the company supplies customers worldwide through sales partnerships. Since 2014, leadership has been in the fourth generation under Korinna Sophia Schwittay (née Siepmann).
- Site
- Warstein-Belecke
- Processes
- Drop forging, Hot extrusion, Machining (subtractive), Welding technology (welding processes for assemblies, also safety-relevant), Toolmaking, Heat treatment, Finishing, Assembly of complete units
- Materials
- Steel, Drop forging, Hot extrusion, Machining (subtractive), Welding technology, Heat treatment, Toolmaking
- Founded
- 1834 (pred
- Employees
- 450
- Industries
- General mechanical engineering, Power plants/Energy, Wind energy, Construction machinery, Raw material extraction/Mining, Rail transport
- 01
Development & technical-metallurgical consulting
- 02
Toolmaking
- 03
Drop forging & hot extrusion
- 04
Heat treatment
- 05
Machining
- 06
Welding technology
- 07
Finishing
- 08
Assembly of complete units
Materials & Processes
Steel
Base material for all forged, heat-treated and machined components.
Drop forging
Production of custom forgings, also in small and medium series.
Hot extrusion
Forming process for complex steel components with optimized wall thickness.
Machining (subtractive)
Finish machining of forgings into ready-to-install components.
Welding technology
Joining of assemblies by welding engineers, also in safety-relevant applications.
Heat treatment
Achieving the required material properties of the forgings.
Toolmaking
In-house production of dies and tools for forging production.
Sites
Warstein-Belecke
DEHeadquarters and production plant (drop forge, machining, PERSTA valves)
- Lot size
- Small to medium series
- Materials
- Steel
- Drop forging presses
- Counterblow hammers
- Heat treatment systems
- Machining equipment
- Welding technology
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Drop forgingForming | – | – | – | Small series – Medium series | Steel |
| Hot extrusionForming | – | – | – | – | Steel |
| Machining (subtractive)Cutting | – | – | – | – | Steel |
| Welding technology (welding processes for assemblies, also safety-relevant)Joining | – | – | – | – | Steel |
| ToolmakingEngineering | – | – | – | – | – |
| Heat treatmentHeat treatment | – | – | – | – | Steel |
| FinishingSurface | – | – | – | – | – |
| Assembly of complete unitsAssembly | – | – | – | – | – |
| DevelopmentEngineering | – | – | – | – | – |
| Technical & Metallurgical ConsultingEngineering | – | – | – | – | – |
Additional services
Reference customers
History
- 1834
Foundation of the predecessor operation by Wilhelm Bergenthal and Ferdinand Gabriel in Warstein (steel shovels)
- 1836
Construction of one of the first puddling works in Westphalia
- 1891
Takeover of the operation by Louis Peters (Peters & Cie.); management by Emil and Hugo Siepmann; conversion into a drop forge
- 1909
Purchase of an industrial site in Belecke with rail connection; relocation of production
- 1910
The Siepmann brothers officially acquire the company
- 1916
Start of production for the automotive industry (including Mercedes-Benz, BMW, Adler)
- 1938
Government contract; renaming to Siepmann-Werke; first production line for forgings in Germany; second-largest drop forge in Germany after Krupp
- 1944
Peak with around 39,980 t of forgings and 1,700–3,000 employees, including forced laborers
- 1946
Foundation of the subsidiary PERSTA-Stahlarmaturen GmbH & Co. KG; trading branch Forged Steel Valve Limited in Montréal
- 1963
Severe explosion at the plant with 20 fatalities
- 2014
Korinna Sophia Schwittay (née Siepmann, 4th generation) takes over the leadership of the corporate group