Cetto AG – Company profile
Cetto AG has been a family-owned and family-managed business since 1922 with its headquarter in Ratingen, Germany. Our core areas of expertise include welding technology, mechanical engineering, radioactivity measurement technology, and the reconditioning of roller bearings. We serve a broad range of customers both nationally and internationally.
As a family-owned business we thrive for sustainable approach and always consider the well-being of future generations in our corporate management. This commitment is also reflected in our products: high quality and competence in manufacturing and repair expertise help ensure the longevity of our solutions.
Combining our sense of tradition with innovation and the courage to make decisions, we develop tailor-made solutions to meet our customers’ needs. Reliable and flexible, we offer our expertise in the following areas:
- Mechanical engineering and welding technology With many years of experience, our experts are looking forward to work out the most cost-effective solution with you. We are able to manufacture according to your specifications and technical drawings.
- Radioactivity measurement technology We develop and manufacture measurement systems for detecting radioactive radiation. Our inspection systems examine steel, steel scrap, raw materials, and waste. In addition, we offer a wide range of services, from consulting and planning new systems or assessing existing installations to project implementation and subsequent after-sales support.
- Roller bearing reconditioning In cooperation with Timken, we offer roller bearing reconditioning services to extend service life and ensure optimal utilization. Our services cover bearings from all premium manufacturers.
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Mechanical engineering for highest demands
As a renowned mechanical engineering company with over 100 years of tradition, we specialize in manufacturing and repairing steel products weighing up to 32 tonnes. With our modern machinery and fully equipped workshops, we precisely meet even the most demanding and individual customer requirements.
Our experienced engineers provide expert advice and extensive technical know-how to develop tailored, sustainable solutions for your specific needs. We carry out repairs, maintenance work, and new manufacturing projects in accordance with your specifications and technical drawings while still meeting highest quality standards.
Welding has been our passion since 1922
Starting with the production of shielded electrodes, we have evolved into specialists in welding high-strength materials with high alloys and carbon content.
Our hardfaced rolls set the benchmark for hot rolling mills and continuous casting machines. With our KMS hard-facings, we can significantly enhance the wear, heat, and corrosion resistance of your products. Coating your rolls with our KMS Welding material ensures maximum life cycle. Once the working layer has reached the end of its characteristics, it can be reapplied with ease, significantly improving cost-effectiveness.
We offer the optimal hardfacing material for every case.
Our core expertise is hardfacing of rolls, strikers, spindles, drive components, and all types of worn out metal components.
Our extensive portfolio of self-developed cored wires is designed to improve surface characteristics or restore components to their specified drawing dimensions and tolerances.
Our welding engineers will be happy to provide you with individual, expert advice tailored to your project.
Our welding processes:
- Submerged Arc Welding (SAW)
- MAG Welding (Metal Active Gas)
- TIG Welding (Tungsten Inert Gas)
Cetto AG - High-prescision radioactivity measurement technology
Since 1992, Cetto AG has been developing high-performance measurement systems for detecting radioactive radiation. Depending on the measurement task, our stationary and mobile systems use detectors made from different materials and in various sizes, meeting the highest standards of reliability and safety.
Radioactive sources are used in numerous industrial, scientific, and medical applications. They can also originate from natural sources and, for example, accumulate inside pipes. If these materials enter the recycling cycle through improper or illegal disposal, or are accidentally melted down during steel production, they can cause significant economic, environmental, and health-related damage.
Our radioactivity measurement systems detect radioactive radiation at an early stage, helping to effectively protect employees, facilities, the environment, and the public.
Tailored measurement systems
Our systems feature a flexible, modular design and can be adapted to a wide range of applications and requirements. Solutions range from stationary monitoring systems for trucks, trains, and conveyor belts to mobile systems for grabs and laboratory equipment for steelworks.
Innovation and experience
Through continuous research and technological development, we provide measurement systems that meet the latest technical standards. At Cetto AG, we do not offer off-the-shelf measuring devices. Instead, we work closely with our customers to develop solutions precisely tailored to their specific operating conditions and measurement requirements.
Your benefits at a glance:
- Highly sensitive detectors for every measurement scenario, including plastic scintillators and crystal detectors
- Stationary and mobile measurement systems for a wide range of cases
- Modular system architecture for customized solutions
- Development and manufacturing in Germany
- Continuous advancement based on modern electronics
- Personal consultation and project planning
- Over 30 years of experience in radiation measurement technology
Stationary portal monitoring system
ConRaD C5
The stationary ConRaD C5 portal monitoring system enables reliable, fully automated screening of all incoming and outgoing materials for radioactivity. Trucks and trains are dynamically monitored for radioactive radiation as they pass through the portal.
In case of an alarm, nuclide-specific analysis can be performed, depending on the detector type installed. This allows radioactive isotopes such as Americium-241, Cesium-137, or Cobalt-60 to be identified, while distinguishing natural background radiation from medical and artificial industrial sources.
Your benefits at a glance:
- Individually configurable number, size, and type of detectors, tailored to your specific requirements
- Complete recording and documentation of all measurement results
- Automatic identification and classification of different radioactive nuclides (e.g., Am-241, Cs-137, or Co-60), depending on the detector type
- Reliable alarm notification in case of an incident, both visually and acoustically on site and by email to predefined recipients
Mobile measurement system
ConRaD GrabScan
For measuring material handled by grabs, the can be equipped with crystal detectors. Thanks to the short distance between the material being measured and the detector, combined with the long measurement time during material handling, the ConRaD GrabScan delivers outstanding measurement performance.
The detector signals are transmitted via modem to the evaluation unit in the crane operator’s cabin, where visual and acoustic alarms are triggered in case of an alarm.
Because of its crystal detectors, the ConRaD GrabScan is capable of identifying radioactive nuclides.
Your benefits at a glance
- Individually configurable number and size of crystal detectors, tailored to the dimensions of the grab
- Complete recording and documentation of all measurement results
- Ability to detect and identify various radioactive nuclides (e.g., Am-241, Cs-137, or Co-60)
- Reliable alarm notification in the event of an incident, with visual and acoustic signals in the operator’s cabine
Automatic monotoring of materials for radioactive contamination
ConRaD Dust Scan, ConRaD Conveyor
Radioactively contaminated dust, slag, or exhaust air pose significant health risks if radioactive particles enter the human body. Since radioactivity cannot be detected by human senses, reliable measurement systems are essential for early detection.
Our measurement systems continuously monitor conveyor belts, silos, and exhaust air systems for radioactive contamination. If radioactive radiation is detected, an alarm is triggered automatically. This enables radionuclides such as Cs-137 , to be detected in dust even after the melting process.
Your benefits at a glance
- Fully automated monitoring of conveyor belts, silos, and exhaust air systems
- Continuous, real-time detection of radioactive contamination
- Highly sensitive detectors for reliable radiation measurement
- Rapid alarm notification when predefined threshold values are exceeded
Cetto AG – Roller bearing reconditioning
Cetto AG reconditions your used roller bearings. Recover valuable components and reinforce longevity. We inspect your bearings and offer tailor-made reconditioning solutions. Once inspected, preserved, and securely packaged, your bearings are ready for their next application.
In many cases, we achieve tighter tolerances than those specified for new bearings. This enables optimal load distribution and extends the duration of use.
As an independent provider, we are not focused on selling new or replaced bearings. Instead, we concentrate exclusively on our customers’ interests, combining the highest quality with significant cost savings.
Our reconditioning services cover bearings from all premium manufacturers.
We currently work with customers across the following industrial sectors:
- Steel and Metal Processing: Continuous casting plants, hot rolling mills, cold rolling mills, plate mills, and aluminium mills
- Energy and Recycling: Energy companies and recycling facilities
- Other Industries: Paper, grain processing, sugar, and cement industries
Our motivated and highly qualified team is fully equipped to respond effectively and efficiently to your requirements, whether in emergency situations or as part of planned maintenance activities.
Our partner in rolling bearing reconditioning is Timken.
Reconditioning instead of replacement - Making smart use of resources
For us, sustainability begins with keeping valuable resources in use for as long as possible. Through professional reconditioning of worn components, we give them a new lease of life rather than replacing them prematurely. This not only conserves raw materials and energy but also reduces waste and the need for new production.
Our reconditioning processes significantly extend product-longevity of various components without compromising on quality, safety, or performance. Every reconditioned component helps conserve materials and reduce our customers’ environmental footprint.
In this way, we combine economic efficiency with responsible business practices, supporting a sustainable circular economy in which existing resources are used to their full potential.
Renewable energy for our electricity needs
We now source more than 80% of our electricity from renewable energy.
A substantial share of this energy is generated by our own photovoltaic system, which covers more than 65% of our electricity needs through solar power.
This reduces our reliance on conventionally generated electricity and represents a tangible contribution to a more sustainable energy supply. At the same time, we continue to work towards increasing the share of renewable energy and improving energy efficiency at our site.
From our point of view, the use of renewable energy is an ongoing process and an integral part of responsible corporate management. Through our photovoltaic system and the procurement of green electricity, we are laying the foundations for a sustainable future today – and we are committed to continuing along this path step by step.
Bee sustainable - Connecting with nature on our company premises
Sometimes, sustainability starts on a very personal level. In their spare time, our company’s management pursues beekeeping with great passion. Inspired by this personal interest, we have our own beehives on our company premises.
For us, beekeeping is not a large-scale conservation project, but first and foremost an expression of a personal appreciation for nature. At the same time, it brings additional benefits: honeybees pollinate plants in the surrounding area and highlight the importance of diverse habitats and an sufficient supply of flowering plants.
With our bees, we aim to bring a little piece of nature into our everyday working environment, spark interest in beekeeping, and encourage a more mindful approach to our environment.
We see this initiative as a small, personal contribution to nature – not as a substitute for the essential protection of wild pollinators and their natural habitats.
Cetto AG – Our history and milestones
Cetto AG represents technological innovation, highest quality standards, and sustainable development.
Since its founding in 1922, the company has evolved from a specialist in welding technology into a leading provider of measurement technology, radiation detection, and roller bearing reconditioning.
Our continuous progress is built on a strong heritage, visionary leadership, and a dedicated team.
Discover the key milestones in our company’s history and join us on a journey through a century of pioneering spirit and transformation.
| 2024 | After 12 years at the top of the company, Barbara Rübbelke-Dehnhardt hands over her position as Chairwoman of the Executive Board to her son, Lukas Rübbelke. Cetto’s Operations Manager, Daniel Keuck, joins the Executive Board. Today, approximately 45 employees work in production and administration at Cetto AG. |
| 2022 | Cetto AG celebrates its 100th anniversary. |
| 2017 | Lukas Rübbelke joins the Executive Board. |
| 2012 | Following the death of her husband, Dr. Stefan Dehnhardt, Barbara Rübbelke-Dehnhardt takes over the management of the company. |
| 2007 | Introduction of the roller bearing reconditioning business in partnership with bearing manufacturer TIMKEN. |
| 1992 | Establishment of the measurement technology department, including the development and marketing of detectors for identifying radioactive materials in the steel and recycling industries. |
| 1981 | Dr. Stefan Dehnhardt begins working as a welding engineer in his father’s family business and gradually assumes responsibility for managing the company. |
| 1961 | Relocation to Dechenstraße 15 in Ratingen, Germany. |
| 1946 | Max Dehnhardt joins the family business, sharing responsibility for the company’s development before eventually becoming its sole managing director for a total of 45 years. The product portfolio is expanded to include the “Riecetto process,” a welding method for non-weldable cast materials. |
| 1936 | Heinrich Dehnhardt acquires the company from Fred Cetto and takes over its management. |
| 1923 | The company is renamed Elektrische Schweissbetriebe Cetto und Gärtner. |
| 1922 | Brockhaus & Co. GmbH is founded, with Fred Cetto serving as Chief Engineer. Its main activities include manufacturing coated welding electrodes, selling welding machines, and providing repair welding services. |
Active worldwide & globally connected
Our company successfully operates across international borders, delivering projects in numerous countries around the world. This global experience strengthens our network, broadens our perspectives, and enables us to develop solutions that work internationally while meeting local needs.
We look forward to further expanding our global cooperation and building relationships with new countries, markets, and partners. We welcome international partnerships at any time.
A look at the countries we have successfully worked with
- Egypt
- Belgium
- France
- India
- Japan
- Canada
- Mexico
- Norway
- Austria
- Saudi Arabia
- Sweden
- Switzerland
- Spain
- Thailand
- United States
Everything you need to know about Cetto AG - Frequently asked questions
This FAQ section helps you plan your projects and provides answers to questions about our range of services. Our engineers support you at every stage, from initial consultation and manufacturing to your specifications and drawings, through to the long-term reconditioning of heavy-duty machine components.
Discover more about our workshop facilities, which can handle components weighing up to 32 tonnes, as well as our additional services, including maintenance, training, and the assessment of existing legacy equipment.
Who we are
For over 100 years, Cetto AG has been a family-owned and managed company with its headquarter in Ratingen, Germany. Our core areas of expertise include welding technology, mechanical engineering, roller bearing reconditioning, and measurement technology, serving a broad customer base both nationally and internationally.
Combining a strong sense of tradition with innovation and the courage to make decisions, we develop tailored solutions to meet our customers’ individual needs.
What motivates us?
We are driven by the ambition to solve technical challenges reliably, precisely, and sustainably. Since 1922, we have stood for engineering expertise, innovative strength, and the conviction that quality and responsibility go hand in hand.
Our goal is to make industrial processes safer, more efficient, and more durable – in mechanical engineering, radiation measurement technology, and reconditioning. Above all, we are motivated by one thing: developing solutions for our customers that make a real difference.
Our commitment to quality is also reflected in our standards. We are certified to ISO 9001 and DIN EN ISO 3834. These certifications combine our technical expertise with clearly defined quality management processes and responsible business practices.
We take a long-term perspective, act responsibly, and work every day to develop technologies that deliver outstanding results worldwide.
Which industries do we serve?
We serve a broad range of industrial sectors that rely on precision engineering, reliable measurement technology, and durable mechanical engineering solutions. Our customers include national and international companies with high standards for quality, safety, and efficiency.
Our Key Industries at a Glance
- Steel Industry
Continuous casting plants, hot and cold rolling mills, plate mills and aluminium mills. - Recycling Industry
Metal and scrap recycling, material handling facilities and sorting plants. - Energy Sector
Energy companies, power plant operators and utility providers. - Process Industries
Paper manufacturing, grain processing, sugar production and cement plants. - Logistics & Material Handling
Port operations, transshipment centres and material handling systems. - Forging Industry
Hot forming and industrial forging processes.
What machinery do we have available?
Our customers benefit from a powerful, modern machine park that enables the precision manufacturing, repair, and reconditioning of steel components weighing up to 32 tonnes. Our equipment covers a wide range of industrial requirements, from heavy-duty machining and welding technology to precision measurement technology.
Our Machinery and Equipment Includes
- Large-Capacity Lathes for machining heavy components with large diameters
- Milling Machines & Machining Centres for precise mechanical machining
- Welding Systems (SAW, MAG, TIG) for hardfacing, overlay welding and repairs
- Measurement & Inspection Equipment for quality control and final inspection
- Special-Purpose Machines for reconditioning and surface finishing
For a complete list of our machinery and equipment, please see our detailed machine inventory.
How can we support you?
We support our customers wherever precision, safety and industrial performance are essential. By combining mechanical engineering, radiation measurement technology and reconditioning, we deliver solutions that improve entire production processes – from manufacturing and quality assurance to equipment availability.
Our Key Areas of Support
- Mechanical Engineering & Heavy-Duty Manufacturing
Manufacturing, repair, and reconditioning of steel components weighing up to 32 tonnes, produced precisely to your technical drawings and in accordance with the highest quality standards. - Radiation Measurement Technology
Stationary, mobile, and process-integrated measurement systems for detecting radioactive radiation, designed for steelworks, recycling facilities, and material handling operations. - Roller Bearing Reconditioning
Reconditioning of premium-brand roller bearings to a quality comparable to new bearings, including tighter tolerances and significant cost savings. - Service & Emergency Support
Fast response times, qualified technicians and reliable on-site support for malfunctions, maintenance and planned operations. - Individual Consulting & Project Planning
Tailor-made technical solutions adapted to your processes, equipment and safety requirements.
How quickly can we respond to urgent requests?
Thanks to our well-structured organization and direct communication channels, we respond quickly and flexibly, even to urgent requests. Decisions are made without unnecessary delays, allowing us to assess, prioritize, and implement projects efficiently.
As a result, our customers benefit from short response times, the best possible delivery lead times, and reliable, straightforward cooperation.
