Steel Division

Electrical industry

Faster, more resource-saving, more economical, more durable, lighter

Properties that are constant companions in handling and development in the course of the electrification of diverse areas in our daily lives and in industries. For voestalpine, they are an incentive for top performance in the development of non-grain-oriented electrical steel and pole sheets for the electrical industry. From generator design to motors of all kinds and static machines. In close cooperation with international customers and research institutions, tomorrow's solutions are continually being developed.

Efficiency as a hobbyhorse

There is hardly an industry that is growing faster and has greater demands on efficiency than the electrical industry. In this highly competitive industry, solutions are constantly being created at the highest level. In an effort to remain one step ahead, voestalpine has made it its business to permanently monitor research results and to collaborate with international customers in developing tailor-made solutions that can be readied for serial production. The focus is not exclusively on the material itself. voestalpine thinks ahead and has comprehensive expertise in the area of insulating varnish systems. First and foremost, Backlack technology, an innovative joining process for electrical steel strip packages, has become indispensable for demanding customers.

Precision as a success factor

The pressure to optimize in the electrical industry is enormous, not least as a result of legal requirements. One of the prerequisites to high-precision component production is the use of high-precision electrical steel. voestalpine is aware of this and supplies tailor-made material that meets the highest demands in terms of shape tolerance and processability. Precise geometric properties as a result of continuous cold-rolling processes, consistent mechanical properties, low tension levels in wide and slit strip, clean surfaces, high adhesiveness and abrasion-resistant insulation coatings with best adhesive properties in the Backlack coating make isovac® a product that more than meets high industry demands.

Green power as motivation

Are you ready for a green future? voestalpine is optimizing its ecological footprint along the entire lifecycle. From the extraction of raw materials, steel production and further processing to the use and reuse of the material. 

Its use in the field of e-mobility or alternative energy generation in wind or hydroelectric power plants makes isovac® an irreplaceable material for customers who demand 100% performance and at the same time want to set the course for a green future.

0% troubles as a philosophy

100% customer-oriented. voestalpine thinks in terms of solutions. From preliminary contact to delivery of the finished product. In addition to sophisticated logistics strategies, voestalpine offers practical and industry-specific process support. Whether it be in annealing trials, the adjustment of a stamping tool or assistance in making the transition to a new grade, highly qualified specialists will offer their expertise to you each step of the way.

voestalpine isovac® Isolierlacksysteme

Backlack, a coating that connects 

Insulating varnishes and bonding processes are absolutely essential. With backlack technology, the foundation has been laid for an electrical steel that meets the ever-increasing demands on the efficiency and performance of electric motors. The most non-damaging and flexible process is full-face bonding of the lamellas. Freedom of design in large-scale industrial production, unique mechanical stability, best magnetic properties, improved thermal conductivity and enormous advantages in acoustic behavior speak a very clear language.

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Steel strips

Electrical steel strip

Electrical steel strip

isovac®, electrical steel made by voestalpine, offers best magnetic properties and provides highest energy efficiency.

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Electrical steel strip

isovac® is the non-grain-oriented electrical steel made by voestalpine and stands for highest energy efficiency. Electrical steel is a material used in many different forms in the construction of magnetic cores in electrical appliances and machinery. voestalpine is Europe's market leader for non-grain-oriented semi-finished electrical steel.


isovac® made by voestalpine is a high-quality electrical steel for electric motors, generators and transformers of all kinds. 

The high demands of motors in general and especially drive motors in the field of e-mobility are met by isovac® with respect to efficiency and performance, highest permeabilities, lowest losses and, where required, high strength. 

Together with the pole plates of voestalpine, isovac® electrical steel makes a significant contribution in generator design with respect to increases in the efficiency of a wide range of generator types and sets new standards in terms of performance and sustainability.

The specialists of voestalpine are continually developing and optimizing special high-quality isovac® grades for static machines such as transformers, reactance coils or magnets for particle accelerators.

Product portfolio

Customized solutions are indispensable in a dynamic market marked by a wide variety of individual demands. With respect to compact engine design and high efficiency, voestalpine has just the right product for each customer.

Insulating varnish systems

The insulating varnish applied to the strip surface is a key factor in the highest performance of machines made of isovac® electrical steel. This is why voestalpine also relies on the highest quality of the insulating varnish systems. In close collaboration with leading European varnish manufacturers, voestalpine supplies insulating varnishes that contain no toxins, carcinogens, mutagens, formaldehyde or chromium compounds. The coatings meet all applicable EC directives (RoHS Directive 2011/65/EC).


Consistent mechanical properties across the entire length of the strip and clean surfaces that cause minimal abrasion on the punching tool are prerequisites to optimized punching processes.

The result of our stable and continuous rolling process is a reduction in the steel strip thickness tolerance value. Subsequent continuous annealing reduces material stress to a minimum. This enables voestalpine customers to manufacture components with the highest precision.

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isovac® is the electrical steel made by voestalpine and stands for highest energy efficiency in future-oriented sectors such as e-mobility and generator manufacturing.

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Upgrade your Backlack! Excellent processing properties lead to a significant increase in production process efficiency.

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