Heat treatment of steel and metals – hardening, nitriding, annealing – as well as CNC complete solutions (SILUTION).
Siegener Werkzeug- und Härtetechnik GmbH
Siegen (Kolbeweg 7, headquarters & hardening centre) · Siegen region (3 sites of the SWF group)New on Amplifa
About SWF
Siegener Werkzeug- und Härtetechnik GmbH (SWF) specialises in thermal and thermochemical heat treatment of steel and other metals. The process spectrum covers hardening (case hardening, protective-gas hardening, vacuum hardening, salt-bath hardening, tempering, ageing, cryogenic treatment), nitriding (gas nitriding, plasma nitriding, gas nitrocarburising SINOX/SINIT, gas oxinitriding, Tenifer salt-bath nitrocarburising Q/QP/QPQ, salt-bath carbonitriding, SiCor Pro) as well as annealing (stress-relief, normalising, solution and soft annealing, special annealing) and vacuum brazing. Materials processed range from unalloyed to highly alloyed steels, tool and PM steels, stainless steels, cemented carbides as well as aluminium, copper and brass alloys. Under the umbrella of the group "SWF – Eine Gruppe für präzise Lösungen" ("SWF – A Group for Precise Solutions"), the company operates three sites in the Siegen region with a hardening centre, CNC machining and plasma nitriding. With the complete solution SILUTION, SWF combines machining, heat treatment and logistics from a single source; the product SiB testblock provides hardness comparison plates for indirect calibration of hardness testers. Customers include the mechanical engineering, tool and mould making and hydraulics industries, among others.
- Site
- Siegen
- Processes
- Case hardening, Protective-gas hardening, Vacuum hardening, Salt-bath hardening, Tempering, Ageing, Cryogenic treatment, Gas nitriding
- Materials
- Steel, Material steel, Tool steels, highly alloyed, corrosion-resistant stainless steels, rust- and acid-resistant steels, higher-alloyed and chromium-containing steels, unalloyed to medium-alloy steels, unalloyed structural steels
- Certificates
- ISO 9001 (quality management), Environmental management certified (ISO 14001 not explicitly named), Energy management audited (EnMB, not explicitly stated as per ISO 50001), ISO 9001, ISO 14001, Energy management (EnMB, audited)
- Founded
- 1919
- Industries
- Tool and mould making, Mechanical engineering, Hydraulics industry, Machining / tool industry, Hydraulics industry (salt-bath carbonitriding of stainless steel cutting rings)
- 01
Consulting and material/process selection
- 02
CNC machining (milling and machining centre)
- 03
Heat treatment (hardening, nitriding, annealing)
- 04
Hardness testing, metal analysis and quality reports
- 05
Logistics with in-house metal courier and freight partners
Materials & Processes
Unalloyed to medium-alloy steels
Structural steels and tempering steels for case hardening, protective-gas hardening, stress-relief annealing and gas nitrocarburising.
Case-hardening, tempering and RSH steels
Part of the SILUTION material portfolio, e.g. 1.0503, 1.7131, 1.7225, 1.6587, 1.8550.
Tool steels (cold-work/hot-work steel, HSS, PM steel)
e.g. 1.4034, 1.4112, 12344, ASP 2023–2060, CPM steels and K390 Microclean for vacuum hardening and plasma nitriding.
Stainless and acid-resistant steels
e.g. 1.4301 and 1.4571 for gas oxinitriding, salt-bath carbonitriding and solution annealing.
Cemented carbides
Grades K10 to K40F in the material portfolio of the complete solutions.
Aluminium alloys
Stress-relief annealing and solution annealing of aluminium components.
Copper alloys
e.g. AMPCO M25; annealing treatments to improve formability.
Brass (MS 58)
Non-ferrous alloy in the material portfolio of mechanical machining.
Titanium
Annealing of titanium according to the company's service overview.
Sites
Siegen (Kolbeweg 7)
DEHeadquarters, hardening centre, heat treatment, complete solutions (SILUTION), administration
- Part weight / size
- Piece weights up to 5,000 kg; batches up to 15 t (pit
- Lot size
- Single parts to batches in the tonne range
- Materials
- Steel, tool steel, stainless steel, aluminium, copper
- Pit furnaces up to 15 t
- Gas nitriding furnaces (600×600×1200 mm and 900×900×1500 mm, year of manufacture 2017)
- Vacuum system with 10 bar quenching pressure (1994)
- Plasma system (from 1999)
- Salt-bath system
- Salt-bath extraction system 25,000 m³/h (2024)
- 3D coordinate measuring machine
- Hardness testers (Rockwell, Vickers, Brinell, Leeb, UCI)
- Spectrometer
Siegen region (other sites)
DECNC machining, plasma nitriding, complete solutions of the SWF group
- Materials
- Steel, stainless steel, tool steel
- Milling and machining centres (investment 2006)
Components & Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Case hardeningHeat treatment | – | – | – | – | Steel |
| Protective-gas hardeningHeat treatment | – | – | – | – | Steel |
| Vacuum hardeningHeat treatment | – | – | – | – | Steel |
| Salt-bath hardeningHeat treatment | – | – | – | – | Steel |
| TemperingHeat treatment | – | – | – | – | Steel |
| AgeingHeat treatment | – | – | – | – | – |
| Cryogenic treatmentHeat treatment | – | – | – | – | Steel |
| Gas nitridingHeat treatment | – | – | – | – | Steel |
| SiCor Pro (alternative to blackening)Surface | – | 850 mm | 500 kg | – | Steel, highly alloyed steels, corrosion-resistant steels |
| Plasma nitridingHeat treatment | – | – | – | – | Tool steels, highly alloyed, corrosion-resistant stainless steels |
| Tenifer salt-bath nitrocarburising (Q/QP/QPQ, Tenifer N)Heat treatment | – | – | – | – | Steels, unalloyed to medium-alloy steels |
| Gas nitrocarburising (SINOX/SINIT)Heat treatment | – | – | – | – | unalloyed to medium-alloy steels, iron-based materials |
| Gas oxinitridingHeat treatment | – | 900 mm × 900 mm × 1500 mm | 2500 kg | – | higher-alloyed and chromium-containing steels, corrosion-resistant (stainless) steels |
| Salt-bath carbonitridingHeat treatment | – | – | – | – | Steel |
| Stress-relief annealingHeat treatment | – | 500 mm / 2800 mm | 300 kg / <5000 kg | – | unalloyed structural steels, tempering steels, tool steels, rust- and acid-resistant steels, aluminium alloys, copper alloys |
| NormalisingHeat treatment | – | – | – | – | Steel |
| Solution annealingHeat treatment | – | – | – | – | – |
| Soft annealingHeat treatment | – | – | – | – | Steel, higher-carbon steels, tool steels |
| Special annealingHeat treatment | – | – | – | – | – |
| Vacuum brazingJoining | – | – | – | – | – |
| SILUTION (complete solution machining & heat treatment)Engineering | – | – | – | – | – |
| SiB testblock (hardness comparison plate for calibration)Testing | – | – | – | – | – |
| Hardness testing & metal analysisTesting | – | – | – | – | – |
| 3D coordinate metrologyTesting | – | – | – | – | – |
| CNC machining / milling and machining centreMachining | – | – | – | – | – |
| Metal courier service (collection/transport)Assembly | – | – | – | – | – |
6 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Gas nitriding system | – | – | – | 2017 | Siegen |
| Vacuum system (vacuum hardening, 10 bar quenching pressure) | – | – | – | 1994 | Siegen |
| Plasma system (plasma nitriding) | – | at least 1 | – | 1999 | Siegen |
| Milling and machining centre | – | – | – | 2006 | Siegen |
| Salt-bath system (salt-bath hardening/salt-bath nitrocarburising) | – | – | – | – | Siegen |
| 3D coordinate measuring machine | – | – | – | – | Siegen |
Additional services
Quality & Certification
All process parameters are documented without gaps as process evidence; the hardness testers are calibrated annually. The laboratory offers hardness testing (Rockwell, Vickers, Brinell, mobile via Leeb and UCI), metallography, material analysis by spectrometry, first-article inspection reports as well as heat-treatment bath analytics.
| Evidence | Siegen |
|---|---|
| ISO 9001 | |
| ISO 14001 | |
| Energy management (EnMB, audited) |