For more than 90 years now, the Tenova LOI Thermprocess has been supplying heat treatment facilities for metal processing plants in the world's main industrial regions. Today, our companies
- B.M.I. Fours Industriels, Lyon, France
- IVA Industrieöfen, Dortmund, Germany
- Mahler, Plochingen, Germany
- Schmetz, Menden, Germany
are the leading providers of high-end heat treatment furnaces and services.
Tenova LOI Thermprocess has developed both vacuum and controlled atmosphere continuous and non-continuous furnaces to solve all types of treatment problems. The knowhow that we have developed over decades, our strength in worldwide sales and services and our ongoing development efforts allow us to steadily strengthen our position on world markets. Our employees are dedicated experts in their fields. They will help you to derive maximum benefit from your materials and your heat treatment equipment.
Our main industry partners are:
- Aerospace industry
- Automotive industry
- Heat treatment shops
- Steel suppliers
- Heat exchanger manufacturers
- Tool manufacturers
- Mould and die manufacturers
- Sinter producers
- Surface processing industry
- Industrial and aircraft turbine manufacturers
- Food industry
- Medical industry.
Our synergy effects bring benefits to customers:
- Reliability and quality ensured by many decades of market presence for each company in the group
- Well-founded expert advice based on our bundled process technology expertise
- Innovative technology at reasonable prices
- A complete range of different furnace types
- Highly advanced control and documentation technology
- Substantial innovation potential through development pools
- World-wide market presence - world-wide service
After Market Services
Acid Regeneration PlantsTenova owns the Acid Regeneration know-how and due to its rich experience is able to offer the up-to-date solutions for hydrochloric acid regeneration by means of spray roaster and fluidized bed giving the customers an opportunity to choose the most suitable solution. Tenova can add Acid Regeneration Process to its proven technologies in continuous or push-pull pickling lines and to provide all customers with optimized, tailored and modern Pickling Lines and Acid Regeneration Plants, with the aim to reduce environmental impact and increase the efficiency of the complete pickling process. Tenova is increasing its role as a pole of excellence in technologies and solutions connected with the chemical step of pickling.
After Market ServicesWith our qualified and internationally experienced service team, we guarantee a worldwide quick and economical service to ensure high availability and productivity of the furnaces.
Annealing and Coating Line (ACL) for Silicon Steel StripNon-grain-oriented strip is annealed in a radiant tube furnace using a continuous process after cold rolling to ensure recrystallization and controlled grain growth. Top-quality steel requires strip temperatures above 1100°C and a very dry atmosphere with a high hydrogen content. This is followed by controlled cooling to obtain an extremely flat strip.
Annealing and Pickling Line (APL) for Silicon Steel StripThe hot rolled strips (NGO and GO) are initially annealed in a continuous process to eliminate brittleness prior to cold rolling and to modify the microstructure. The annealing process is followed by a controlled cooling stage with a cooling rate which may range from 5 to 80 K/s depending on the steel grade required.
Annealing and Pickling Line (APL) for Stainless Steel StripTenova, with its over 40 years of experience, has the competence and knowledge of the thermal process which is required for the production of stainless steel strip.
Atmosphere FurnacesOur atmosphere furnaces can be used for various purposes and represent the latest state of the art.
Calcining FurnacesTenova has developed advanced technologies for petroleum coke and coal rotary hearth calciners used to process lignite, sub-bituminous coal, anthracite, brown coal, formed coke briquettes and many other carbon-based products. Its proprietary rotary hearth calciner provides better product quality and higher product yield than traditional rotary kilns.
Carbon Baking FurnacesTenova has designed and supplied carbon baking furnaces for almost every major U.S. carbon electrode manufacturing plant and for many other customers worldwide. For this purpose, Tenova has provided different types of furnaces to fit the specific product and customer requirements. These furnaces are designed to provide a high quality product in an efficient and cost effective way.
Color Coating Lines for Carbon SteelAnswering to the huge demand for coloured products in the markets of architectural, furniture, laminated, co-laminated, food, appliances, and white goods; Tenova provides Colour Coating and Laminating Lines for thin and heavy gauge strip, narrow and wide strip, aluminium strip, carbon steel, silicon steel and even stainless steel strip. Integrating mechanical and process know-how, Tenova offers high quality technology and environmentally friendly process for treating baths and solvent cleaning with heat recovery. The processes are: - Conventional chemical conversion by dip or spray tanks - Advanced “dry-in-place” process by Chemical Coaters - Specifically designed Paint Coaters - Special Catenary or Flotation curing ovens. Over the years Tenova has realized a great number of chemical coaters and passivation/pre-treatment sections, and our production range covers every possible pass-line configuration that can be found in new as well as in existing lines for revamping. Coaters can be fully automatic and moved off line for maintenance purposes. Most featured lines are equipped with two coaters in order to have a possibility to run while maintenance is made on the off-line coater so as to increase productivity. The automotive end users are requesting coating values in specific ranges and these are the basis for the certification of the lines for automotive purposes that Tenova is able to provide for today and tomorrow automotive market demands.
Continuous Pickling LinesTenova supplies high-capacity and high-quality fully automatic Continuous Pickling Lines for carbon steel featuring: • Capacity of up to 2.200.000 ton/year • Process speed up to 350 m/min • Entry/Exit sections speed up to 800 m/min • Potentially zero waste in combination with a dedicated Acid Regeneration Plant.
Decarburizing and Coating Line (DCL) for Silicon Steel StripCold rolled GO Si steel strip is annealed in a continuous process line for primary recrystallization and decarburization. After the steel strip has passed through the DCL furnace, it is coated with magnesium oxide and then dried.
Drying furnaceDrying furnaces are used for drying the goods before they enter the galvanizing bath. The drying process finishes the pre-treatment, which took place in liquid media and ended up with dipping the parts into flux.
Electrolytic Cleaning LineA Cleaning section removes from the strip surface the remaining rolling emulsion and iron fines and dries the strip through several processes and is equipped with the special high-turbulence high-efficiency density (HTHE) electrolytic cleaning tank to enhance the strip cleaning. The strip is brushed with the high efficiency - quick maintenance brushing units of the brush-to-brush type.
Electrolytic Galvanizing Lines (EGL) for Carbon Steel StripTenova EGL technology stands out due to the following distinctive features: • Plating cells • Improved plating process control • Insoluble anodes • Zinc dissolving plants
Flattening and Coating Line (FCL) for Silicon Steel StripFor the final heat treatment process the transformer strip is coated with insulating varnish in an in-line process and then dried in an indirectly heated furnace. The steel strip is heated further in a radiant tube furnace with a controlled atmosphere and then straightened using the integrated hot stretching equipment. This stage is followed by a slow cooling process.
Galvanizing furnace for high temperatureGalvanizing furnaces with ceramic bath area are used for galvanizing of small parts. They are available with natural gas and oil heating. The dimension can be adapted to the intended goods to be galvanized.
Galvanizing furnace with kettleGalvanizing furnaces with kettle are used for galvanizing of structural steel components of large dimension. They are available with natural gas, oil or electrical heating. The dimension can be adapted to the intended goods to be galvanized.
Hard zinc grabMost important tool for maintaining the galvanizing kettle is the hard zinc grab.
Heat Treatment Furnaces for wire of nonferrous metalsChamber furnaces are used for annealing and solution annealing processes of wire coils made of nonferrous alloys (e.g. nickel alloys, Inconel) or also special steels (e.g. duplex or high resistance steels) Furnaces can be custom-designed to meet the specific customer needs. Normally annealing processes require the presence close to the furnace of a dedicated tank for rapidly quenching the products.
Hot Dip Galvanizing/Galvalume Lines (HDG) for Carbon Steel StripCost-effective and high-performance Galvanizing Lines for architectural and structural applications.
HPH® Bell-type Annealing Furnace for Nonferrous StripLOI Thermprocess, with its predecessors Matthias Ludwig and Nassheuer, has been building bell-type annealing plants for more than 60 years. Throughout the world, more than 8500 LOI annealing bases have been installed. About 5000 of these bases operate with HNx controlled atmospheres. More than 3500 bases use HPH® annealing technology, with a proven atmosphere of pure hydrogen.
HPH® Bell-type Annealing Furnaces for non-grain-oriented Silicon Steel Strip (NGO)For over 60 years LOI, has been a technical and economical market leader in Bell-type Annealing technology. A wide variety of innovative details and comprehensive process technology expertise are the result that customers can build on.
HPH® Bell-type Annealing Furnaces for Stainless Steel StripFor over 60 years LOI, has been a technical and economical market leader in Bell-type Annealing technology. A wide variety of innovative details and comprehensive process technology expertise are the result that customers can build on.
HPH® Bell-type Annealing Furnaces for WireLOI Thermprocess, with its predecessors Matthias Ludwig and Nassheuer, has been building bell-type annealing plants for more than 60 years. Throughout the world, more than 8500 LOI annealing bases have been installed. About 5000 of these bases operate with HNx controlled atmospheres. More than 3500 bases use HPH® annealing technology, with a proven atmosphere of pure hydrogen.
HPH® Bell-type Annealing Furnaces with BYPASS+JET Cooling for Carbon Steel StripBYPASS+JET cooling allows highest productivity of the three cooling technologies designed by LOI. High efficient JET cooling hood is combined with a BYPASS system utilizing a gas-water heat exchanger to cool the process atmosphere directly.
HPH® Bell-type Annealing Furnaces with JET Cooling for Carbon Steel StripJET cooling technology does not require open water in the workshop. During cooling, specially designed JET nozzles ensure high air velocity perpendicular to the inner cover, ensuring high heat transfers, while the cooling speed can be controlled by frequency-controlled fans.
HPH® Bell-type Annealing Furnaces with SPRAY Cooling for Carbon Steel StripSPRAY cooling ensures high productivity with low investment costs. After initial cooling by air, the inner cover is cooled with water.
Lamination Furnace for Semi-Finished Silicon Steel StripSemi-finished electrical steel requires an annealing process with recrystallizing, decarburizing and blueing. The punched laminations are continuously annealed in a roller hearth furnace or for smaller capacity in a pusher type furnace.
Multi-stack Bell-type Annealing Furnaces (MBAF) for Silicon Steel StripTenova LOI Thermprocess, with its predecessors Matthias Ludwig and Nassheuer, has been building bell-type annealing plants for more than 60 years. Throughout the world, more than 500 LOI multi-stack annealing bases have been installed. The world-wide market share during the past 10 years is virtually 100%.
Controls and Measuring SystemIncreasing industrial requirements of restoring the proper surface quality of rolls have increasing requirements in terms of in-cycle control of the roll geometrical characteristics and of presence of superficial defects to be eliminated and under-roll-surface defects to be timely discovered.
GrindingPomini is the worldwide leader in the design and supply of Roll Grinders for flat product Rolling mills as well as of special machines for grinding of heavy components.
HandlingModern Roll Shop organization requires frequent handling operations of heavy and bulky components (rolls, chocks), which must be ensured in full safety, but also to be fast and accurate enough to comply with high productivity and modern standards, often by an increasing use of automated processes.
MaintenanceThe increased demand for turnkey projects drove Pomini Tenova to extend since the 90s its portfolio of products with the addition of a wide range of auxiliary machines as presented below.
Pomini Digital TexturingIn the field of cold Rolling, roll texturing is of utmost importance to achieve the correct surface quality on the metal sheet, to grant the highest performance in terms of paintability and formability.
Revamping - Pomini and other OEM GrindersExisting Roll Grinders can be upgraded to perform exactly the same tasks as the most modern machines, with beneficial improvements on productivity, precision and availability. Revamping interventions can be focussed both on mechanical and/or electrical parts. New or special accessories (e.g. Inspection Devices) may of course be added upon request.
Software and AutomationThanks to its specialized and dedicated Software Development Team, Pomini Tenova is able to offer a standardized machine HMI, which allows a perfect integration and an easy operation of all Roll Shop Machines. Moreover, the long term experience and the constant technical exchange with Customers all over the world lead to the development of special software tools aimed at making Roll Shop Operation easier and more efficient.
Push-pull Pickling LinesTenova is a leader in supplying Push Pull Pickling Lines also in Push-Pull and Semi-continuous configuration. Tenova Push Pull Pickling Lines provide a capacity of up to 750.000 ton/year and one of the most important advantages is extra wide production flexibility: • Process speed up to 180 m/min • Thickness up to 12 mm • Single or double entry sections
Roller Hearth Furnace for Carbon Steel Tubes and BarsLOI Thermprocess, with its predecessors Matthias Ludwig and Nassheuer, has been building Continuous roller hearth furnace plants under protective gas atmosphere for tubes, bars, wire coils and semi-finished annealing goods for more than 60 years. Throughout the world, more than 350 LOI roller hearth furnace plants under protective gas atmosphere have been installed.
Roller Hearth Furnace for Nonferrous Steel Tubes and BarsLOI Thermprocess, with its predecessors Matthias Ludwig and Nassheuer, has been building Continuous roller hearth furnace plants under protective gas atmosphere for tubes, bars, wire coils and semi-finished annealing goods for more than 60 years. Throughout the world, more than 350 LOI roller hearth furnace plants under protective gas atmosphere have been installed.
Roller Hearth Furnace for Stainless Steel Tubes and BarsLOI Thermprocess, with its predecessors Matthias Ludwig and Nassheuer, has been building Continuous roller hearth furnace plants under protective gas atmosphere for tubes, bars, wire coils and semi-finished annealing goods for more than 60 years. Throughout the world, more than 350 LOI roller hearth furnace plants under protective gas atmosphere have been installed.
Roller Hearth Furnace for Wire
Specialty Application FurnacesTenova's staff of engineers is fully dedicated to the thermal processes of heating and heat treating. We have the capabilities to build special and sometimes unique furnaces for various industries and applications.
STC® Short Time Cycle Furnaces for BarsAvailable through a license agreement with Daido Steel, the STC® (Short Time Cycle) furnace is a roller hearth batch furnace that performs an impressive variety of annealing processes.
Tinning Lines for Carbon Steel StripTenova proposes an innovative technology for the new generation of tin plating lines. Tenova state-of-the-art technology features the following: • Lowest tin consumption • More uniform coverage, better edges • Advanced Edge Masks design and control • Lowest coating thickness • Less drainage of electrolyte • Electrolyte always available • More flexible production campaigns • No anodes casting plant - No anodes handling • Much higher safety levelthe
Zinc bath housingThe zinc bath housing collects all the fumes arising during dropping the goods into the liquid zinc.