SIEPMANN

What SIEPMANN does

SIEPMANN-WERKE GmbH & Co. KG is a family-owned German steel forging specialist headquartered in Warstein, North Rhine-Westphalia, with a history dating to 1890 and approximately 450 employees. The company develops, manufactures, and markets customer-specific steel product solutions, operating counter-blow hammers up to 350 kJ, 25 MN screw presses, and full downstream capabilities including electron beam welding, MIG/MAG/SAW/PAW welding, heat treatment, CNC machining, and finishing. It also runs an in-house tool and die production facility, enabling short lead times on small and medium batch runs. Its wholly owned subsidiary, PERSTA Stahl-Armaturen GmbH, converts SIEPMANN forgings into certified industrial fittings and valves, including a proprietary two-in-one stop-check valve. The end-markets served are safety-critical industrial OEM segments: power generation (including nuclear, fossil, and renewable), construction and mining equipment, rail, marine, automotive and commercial vehicles, printing machinery, and general mechanical engineering.

SIEPMANN's commercial model is built on direct, long-tenure enterprise relationships with engineering-driven collaboration from the concept phase, supported by dedicated DACH and international sales contacts. Pricing is custom-quote based on part specifications, materials, batch size, and complexity, with multi-year contracts typical in safety-critical segments. Revenue is concentrated in custom, made-to-order components rather than catalogue products, with the company citing approximately EUR 85 million in annual revenue and self-identification as a European market leader in steel forgings. Distribution is exclusively direct; trade fair presence at bauma and Hannover Messe functions as the primary demand-generation channel.

The business is differentiated less by software or IP than by depth of process know-how and regulatory standing: SIEPMANN holds an unusually broad certification stack (ASME, KTA 1401, AD 2000, EN 15085-2, DIN ISO 9001/14001/50001, plus approvals from DNV GL, Bureau Veritas, Lloyd's Register, and ABS), enabling it to supply nuclear, rail, marine, and pressure-equipment customers that competitors without these credentials cannot serve. Ownership remains in the fourth generation of the Siepmann family, held through SIEPMANN-INDUSTRIES GmbH & Co. KG, with Korinna Schwittay as CEO and Nicolai Siepmann as Chairman of the Advisory Board.

Name

SIEPMANN

Legal name

SIEPMANN-WERKE GmbH & Co. KG

Website

https://siepmann.de

Company type

Private

Founded year

1890

Operating status

Operating

Headcount range

251–500 employees

Short description

SIEPMANN-WERKE is a fourth-generation, family-owned German steel forging specialist producing custom die forgings, hot-extruded parts, and certified industrial fittings (via subsidiary PERSTA) for safety-critical OEM customers in power generation, rail, construction equipment, marine, and general mechanical engineering.

Ownership category

akta.pro rank

Product category

Industrial Steel Forging

NAICS

Steel Product Manufacturing from Purchased Steel (3312), All Other Fabricated Metal Product Manufacturing (33299), Fabricated Pipe and Pipe Fitting Manufacturing (332996)

SIC

Fabricated Structural Metal Products (3440), Fabricated Plate Work (Boiler Shops) (3443), Miscellaneous Fabricated Metal Products (3490)

akta.pro primary industry

Steel Plate, Sections & Welded Assemblies (IMADACAD)

akta.pro secondary industries

Heat Treatment & Thermal Processing Furnaces (Hardening, Annealing, Induction) (IMAHADAI), Specialty & Alloy Steel (Stainless, Tool Steel, Electrical Steel, High-Strength/HSLA) (IMAKABAJ)

Keywords

• Steel forging services
• Die forging components
• Hot extrusion steel
• Welded steel assemblies
• Industrial metal components

Headquarters

HQ city

Warstein

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Infrastructure

Revenue model

1. Custom Steel Forging Products: Development, manufacturing and marketing of customer-specific product solutions from steel including die forgings, hot extruded parts, and welded assemblies. Revenue comes from producing custom components for industrial customers across multiple sectors.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

SIEPMANN-WERKE manufactures custom-forged steel components and welded steel assemblies for industrial OEMs. Capabilities cover drop forging up to 70 kg, open-die forging up to 65 kg, hot extrusion, hot bending/forming, welding, mechanical processing, heat treatment, surface finishing, and in-house tool production, with all processes qualified under DIN EN ISO 9001. Output is delivered into power generation (gas and steam turbines), construction equipment, mining, railway, marine, and wind power applications for customers including Volvo, Caterpillar, Liebherr, Siemens, Bosch Rexroth, MAHLE, and MAN.

Product overview

SIEPMANN-WERKE is a steel forging and manufacturing specialist offering an integrated production portfolio. The company's core offering centers on die forging and hot extrusion (Gesenkschmieden & Warmfliesspressen) using counter-blow hammers and screw presses, supported by comprehensive downstream capabilities: welding technology (MIG/MAG, SAW, PAW, EB including robotic welding), mechanical processing (turning, drilling, milling), heat treatment (quenching, tempering, normalising, annealing), and finishing services (grinding, polishing, coating). In-house tool production enables flexible, cost-effective small and medium batch manufacturing. Development and technical/metallurgical consulting are integral parts of the service offering. The subsidiary PERSTA produces high-quality industrial fittings including the proprietary stop-check valve (two-in-one solution) for power plant and industrial applications.

Differentiator

Problem solved

Functional benefit

Brands

• PERSTA Stahl-Armaturen: Worldwide known brand for high-quality industrial fittings and valves, operated as a subsidiary producing fittings for power plants and industrial applications.

Products and services

• Custom drop-forged steel components (up to 70 kg) Drop-forged steel parts up to 70 kg, produced to OEM specifications, used in heavy machinery, power generation, and construction equipment.
• Custom open-die forged steel components (up to 65 kg) Open-die forged steel parts up to 65 kg for heavy industrial applications where tailored geometries and metallurgical properties are required.
• Hot-extruded steel components Steel parts produced by hot extrusion, used when components require specific cross-sectional profiles and material properties for industrial OEM applications.
• Hot-bent and formed steel components Steel components shaped by hot bending and forming for industrial equipment manufacturers in power, construction, railway, and mining sectors.
• Welded steel assemblies Welded assemblies combining forged and formed steel components for industrial OEMs, supplied as ready-to-install units.
• Machined and heat-treated steel components Forged steel parts that have been machined and heat-treated to meet OEM metallurgical and dimensional specifications.
• Surface-finished steel components Forged and processed steel components delivered with surface finishing applied to meet customer corrosion-resistance and appearance requirements.
• PERSTA industrial fittings Industrial steel fittings and valves marketed under the PERSTA brand, supplied by SIEPMANN's subsidiary PERSTA Stahl-Armaturen, for industrial piping and equipment applications.
• Product development and technical consulting for forged parts Engineer-to-order development of new forged components, including metallurgical advisory and process engineering, for industrial OEM customers.

Quantifiable outcome

• Customer saved over EUR 1 million on repair costs within one year using Persta's stop-check valve in a power plant on the Isle of Man
• +1 more outcomes

Named customers24 records

Segments7 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• PERSTA Stahl-Armaturen GmbHcoreStrategic or Co-development PartnerPERSTA Stahl-Armaturen is SIEPMANN's subsidiary company specializing in industrial fittings and valves. PERSTA transforms SIEPMANN's forgings into complete fittings for applications such as nuclear power plants and paper industry equipment. PERSTA holds its own certifications including ASME Stamp Holder status and manufactures the 'stop-check valve' two-in-one product combining stop valve and check valve functions. PERSTA serves the US market with a new product launched in 2016 following successful field testing.

Scale indicators5 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Hirschvogel Holding: German family-owned steel forging specialist producing custom forged components for automotive, commercial vehicle and industrial customers — directly comparable in scale, customer base and integrated forging/machining capabilities.
• Ovako: Swedish/European producer of special steel long products and components for industrial OEMs including bearings, rail and heavy machinery; competes head-to-head with SIEPMANN in European custom forgings for heavy industrial end markets.
• Doncasters Group: Global precision castings and forgings supplier serving aerospace, industrial gas turbines and industrial markets — comparable in producing safety-critical forged components for industrial OEMs and overlapping on welding/certification footprint.
• Leiber Group: German drop-forgings specialist producing custom steel components for industrial and commercial-vehicle customers — a closely comparable niche German forging peer with similar customer/market overlap.

Emerging players

• Bharat Forge: Largest Indian forging group expanding into Europe and industrial/power-generation components — a global forging competitor that increasingly targets the same heavy-industrial OEM customer base as SIEPMANN, albeit from a lower-cost base.

Broad incumbents

• Scot Forge: North American open-die and large steel forgings producer serving power generation, mining, marine and heavy equipment — comparable in safety-critical custom forging scope and certifications, though focused on larger part weights.
• Ellwood Group: US-based producer of engineered steel forgings and castings for industrial, defense and heavy-equipment customers — comparable in certified, large-scale custom forgings supply into similar end markets including power and rail.
• Thyssenkrupp Steel Europe: Large German steelmaker with downstream forging and processing capabilities; overlapping with SIEPMANN on European industrial OEM supply, though at much greater scale and broader product mix.
• Voestalpine: Austrian integrated steel and metal-processing group with forged and rolled specialty steel products for rail, automotive and industrial machinery — competes with SIEPMANN on rail and industrial forgings as part of a much wider portfolio.

Others

• PERSTA Stahl-Armaturen GmbH: Wholly-owned subsidiary of SIEPMANN itself producing industrial fittings/valves (stop valves, check valves, stop-check valves) for power plants; included as a vertically integrated entity rather than an external competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance12 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about SIEPMANN