Manufacturer of complete furnace systems and heat treatment accessories.
Industrieofen- & Härtereizubehör GmbH Unna
Unna (Viktoriastr. 12, 59425)New on Amplifa
About IHU Unna
Industrieofen- & Härtereizubehör GmbH Unna (IHU) has been active in the field of heat treatment since 1993 and is a manufacturer of complete furnace systems for carburizing, hardening, annealing, gas nitriding and air circulation. The portfolio covers pit furnaces, bell furnaces, chamber furnaces and continuous furnaces in electrically or gas-heated versions, as well as an extensive range of system accessories such as annealing retorts, salt bath crucibles, quench tanks, washing machines and convection discs. Almost all components are manufactured in-house, as welded or cast constructions and, depending on customer requirements, in various materials up to titanium and Inconel. Systems are individually planned, manufactured, installed and commissioned; in addition, IHU offers repairs, conversions, maintenance and spare parts also for third-party equipment. Customers come from wind energy, the automotive industry, aerospace, and commercial and in-house heat treatment shops. Around 30 employees work at the Unna site in North Rhine-Westphalia on approximately 4400 m² of operating space.
- Site
- Unna
- Processes
- Pit furnace (manufacturing), Bell furnace (manufacturing), Chamber furnace (manufacturing), Continuous furnace (manufacturing), In-house production of furnace components (welded and cast construction), Repairs and modifications of existing installations, Quenching in oil or polymer mixture (quench tanks), Washing machines for post-quench cleaning
- Materials
- Titanium, Inconel, Clad, Chromium-nickel (CrNi), Stainless steel pipes in various alloys, Stainless Steel, Stainless steel / CrNi, Chromium-nickel (CrNi) / Clad
- Certificates
- ISO 9001:2015, ISO 14001:2015, ISO 9001, ISO 14001
- Founded
- 1993
- Employees
- approx. 30
- Industries
- Wind energy, Automotive suppliers and manufacturers, Aerospace, Commercial and in-house heat treatment shops
- 01
Consultation & requirements analysis meeting
- 02
Design & technical consulting
- 03
Manufacturing (welded and cast construction)
- 04
Assembly & commissioning
- 05
Maintenance, repair & spare parts supply
Materials & Processes
Stainless steel / CrNi
Stainless steel pipes and components in various alloys for furnace interiors and retorts.
Titanium
Titanium ventilation pipes and salt bath crucibles for special process requirements.
Inconel
Material for salt bath crucibles and accessories under high thermal stress.
Chromium-nickel (CrNi) / Clad
Material options for salt bath crucibles in various grades.
Cast construction
Cast fan wheels and cast components for air circulation and charge carriers.
Locations
Unna
DEProduction site and administration
- Part weight / size
- Charge weight up to 25,000 kg
- Lot size
- Custom-built systems and special constructions
- Materials
- Stainless steel, titanium, Inconel, CrNi, cast
- Pit furnace (manufactured up to 3000 mm usable diameter, 4500 mm usable height or 13,500 mm in modular design)
- Bell furnace (clear diameter up to 4650 mm, height 6150 mm)
- Chamber furnace
- Continuous furnace
- Quench tank (oil or polymer mixture)
- Washing machines
Components & Systems
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Pit furnace (manufacturing)Engineering | – | – | – | – | – |
| Bell furnace (manufacturing)Engineering | – | 6150 mm | – | – | – |
| Chamber furnace (manufacturing)Engineering | – | – | – | – | – |
| Continuous furnace (manufacturing)Engineering | – | – | – | – | – |
| In-house production of furnace components (welded and cast construction)Engineering | – | 13 m (shaft length pit furnace) | – | – | – |
| Repairs and modifications of existing installationsEngineering | – | – | – | – | – |
| Quenching in oil or polymer mixture (quench tanks)Heat treatment | – | – | – | – | – |
| Washing machines for post-quench cleaningSurface | – | – | – | – | – |
| Salt bath crucible manufacturing incl. crack testing (FE)Casting | – | – | – | – | Titanium, Inconel, Clad, Chromium-nickel (CrNi) |
| Salt bath heat treatment (carburizing, annealing, neutral hardening, tempering, preheating, saltHeat treatment | – | – | – | – | – |
| Special constructions (endogas retorts, washing drums) on customer requestEngineering | – | – | – | – | – |
| Heat treatment processes supported by complete furnace systems: carburizing, hardening, annealing,Heat treatment | – | – | – | – | Titanium |
| Plasma nitriding (bell furnace)Heat treatment | – | – | – | – | – |
| Manufacturing of Stainless Steel Pipes in various alloys and dimensionsJoining | – | – | – | – | – |
| Repair and modification of existing furnace installations (also from other manufacturers)Engineering | – | – | – | – | – |
| Welded construction and cast construction for base plates (annealing pots, retorts)Joining | – | – | – | – | – |
4 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Pit furnace | Industrieofen- & Härtereizubehör GmbH Unna | – | – | – | Unna |
| Bell furnace | Industrieofen- & Härtereizubehör GmbH Unna | – | clear diameter up to 4650 mm, height 6150 mm | – | Unna |
| Chamber furnace | Industrieofen- & Härtereizubehör GmbH Unna | – | – | – | Unna |
| Continuous furnace | Industrieofen- & Härtereizubehör GmbH Unna | – | – | – | Unna |
Additional services
Quality
IHU is certified according to DIN EN ISO 9001:2015 and DIN EN ISO 14001:2015. Temperature measurement and process control are carried out, among other things, via thermocouples and closed process systems.
| Evidence | Unna |
|---|---|
| ISO 9001 | |
| ISO 14001 |
Company History
- 1993
IHU founded by Friedrich Wilhelm zur Weihen, Friedhelm Kreffter, Karl-Ulrich Rinne and Alfons Brune.
- 1999
Alfons Brune leaves the company.
- 2004/05
Hendrik zur Weihen joins the company as an employee; start of manufacturing pit furnaces in compensator technology.
- 2016
Friedhelm Kreffter, Karl-Ulrich Rinne and Hendrik zur Weihen run the company as managing partners.
- 2019
01.02.2019: Hendrik zur Weihen becomes sole managing partner.