Premium alloys for modern heating

Our BGH THERM resistance alloys offer exceptional resistance to scale build-up and are designed for demanding operating temperatures of up to 1400 °C.

They are characterised by a high electrical resistivity, which enables the efficient conversion of the electrical energy supplied into heat. The heat generated can then be transferred to the surrounding environment via the surface of the element.

A wide range of applications

The possible applications of BGH THERM heating resistance alloys are extremely versatile: Industrial furnaces, heating appliances such as instant water heaters or heating cartridges, household appliances such as hobs, toasters or tumble dryers, as well as electric blankets, seat heaters or other surface heating systems – and much more.

Many years of experience in manufacturing and a genuine focus on the customer

Our customers’ requirements drive us to continuously develop our material grades in a way that is tailored to specific applications and closely aligned with our customers’ needs. Versatile manufacturing options using state-of-the-art production facilities throughout the entire process enable precisely adjustable material properties and a material design that suits our customers’ needs – 100 % „Made in Germany“.

Thanks to extremely tight resistance tolerances, consistent mechanical properties and outstanding winding quality, our products ensure trouble-free processing for our customers – including optimal spiral-forming properties.
See for yourself the benefits of our innovative BGH THERM heating resistance alloys.

Efficient electric heating systems are key to a sustainable yet competitive future. When combined with renewable energy sources and AI-powered control systems, resistance heating elements enable smart temperature control solutions with minimal energy consumption and significantly reduced CO₂‑footprint.

BGH THERM resistance alloys

BGH FecroTHERM

Ferritic iron-chromium-aluminium alloys for the highest temperature ranges up to 1400 °C. Suitable for use in oxidising, sulphurous or carburising atmospheres.

High-performance heating resistance alloys – tested, reliable, durable

BGH FecroTHERM shows a 35% increase in service life at 1400 °C compared with the reference material we examined.

At regular intervals, the service life of our heating wires is tested under thermal cycling conditions up to an element temperature of 1400 °C. To this end, cyclic resistance heating tests are carried out on our in-house heating wire test bench and compared with the service life of commercially available reference materials in the respective material category.
The results showed that BGH FecroTHERM had a 35% longer service life at 1400 °C compared with the reference material we tested.

In addition, we make use of isothermal ageing tests or real-life field tests in our own industrial heat treatment facilities to develop customer-focused and application-specific solutions.

To ensure the consistently high quality of our products, rigorous in-process monitoring and comprehensive testing of the finished products are an integral part of our standards.
These include, among other things, the grade purity test at the end of the production process, a thorough inspection of surface quality and the assessment of mechanical properties.

A key requirement in the field of heating resistance wires is the reliable setting of the resistance per metre specified by the customer. To this end, the electrical resistance values are checked several times throughout the production process and adjusted as necessary.

These standard tests are supplemented by metallographic analyses, which enable a precise assessment of the material microstructure and grain size.

Through the continuous development of our heating resistance alloys, we aim to achieve optimal workability whilst ensuring a long service life.

Heating element test bench for comprehensive in-house testing

Delivery program of BGH THERM heating resistance alloys

Dimensions

Wire: Ø 0,08 … 9,0 mm

Bar: Ø 1,0 … 20,0 mm, Length 300 - 6 500 mm.

Delivery condition

Wire: final annealed | final annealed and pre-oxidized | drawn | bright drawn

Bar: annealed and straightened | drawn/bright drawn and straightened | anneled, ground and polished | drawn, ground and polished

Form of supply

Wire: Coils, spools, drums

Bars

The dimensions, delivery conditions and packaging of our products are dependent on the material grade and product specifications, and must be verified on a case-by-case basis.

Areas of application

Industrial furnaces Chemical and pharmaceutical industries Energy and Building Services Household Automotive

Heating resistance alloys from BGH ensure precise, efficient and long-lasting heating processes in all key areas of industrial furnace construction. Whether in chamber furnaces, shaft furnaces, high-performance high-temperature and kiln furnaces for the glass and ceramics industry, or in continuously operating continuous heat treatment systems – their stability, temperature resistance and process reliability make them the first choice for demanding thermal applications.

Heating resistance alloys from BGH ensure stable, precise and reliable temperature control in chemical and pharmaceutical production – even under the most demanding process conditions. Whether in heating chambers for preheating, tempering or melting, in precisely controlled drying ovens, in robust melting baths and melting vessels, in heated stirring apparatus for homogeneous reactions or in flexible barrel heaters, heating hoods and heating jackets: BGH materials enable efficient, safe and reproducible thermal processes throughout the entire value chain.

Heating resistance alloys from BGH enable efficient, even and long-lasting heat in modern energy and building services systems. They form the heart of high-performance surface heating systems such as heating mats, marble, glass or mirror heating systems, provide pleasant, direct heat in radiant heaters and form the robust, reliable basis for electric radiant heaters in demanding operating environments. This creates comfortable, energy-efficient heat exactly where it is needed.

Heating resistance alloys from BGH provide reliable, rapid and even heat in the home for a wide range of modern applications. In toasters, hobs and electric grills, they ensure efficient heating and precise temperature control, whilst in tumble dryers, hairdryers and dishwashers and washing machines, they ensure consistent, safe and energy-efficient heating processes. In this way, BGH materials combine comfort, suitability for everyday use and durability in key household appliances.

Heating resistance alloys from BGH ensure comfortable, efficient and safe heating functions in the automotive sector – from the interior to the electric powertrain. They enable high-performance seat and steering wheel heating, ensure clear visibility through mirror and windscreen heating, and perform key functions in electric vehicles such as battery preheating, thermal management of batteries and power electronics, and the heating of air conditioning systems. In this way, BGH materials make a decisive contribution to the range, safety and comfort of modern vehicles.

Our grades

BGH FecroTHERM

BGH FecroTHERM are ferritic iron-chromium-aluminium heating resistance alloys containing up to 25% chromium and more than 5% aluminium, which, due to their high electrical resistivity and low density, require less material than BGH NicraTHERM for the same power output.
They are particularly suitable for use in oxidising, sulphurous and carburising atmospheres and remain magnetic up to the Curie temperature of 600 °Ch.

At temperatures above 1000 °C (538 °F), a high-temperature-stable, well-adhering and electrically insulating aluminium oxide layer forms on the surface of FecroTHERM alloys, making them suitable for operating temperatures up to 1400 °C (2550 °F). This allows for higher surface loads compared to NicraTHERM alloys. The oxide layer also acts as a barrier to prevent the progressive diffusion of oxygen inwards and aluminium outwards, thereby positively influencing service life.

FecroTHERM alloys are magnetic up to a Curie temperature of 600 °C and are particularly suitable for use in oxidising, sulphurous or carburising atmospheres. In particular, when in direct contact with reducing atmospheres, the heating elements must be properly pre-oxidised or regularly re-oxidised.

Following use at temperatures above 1000 °C (538 °F), the alloys may develop cold brittleness due to significant grain growth, which subsequently makes them susceptible to impact and shock loads when cold. This behaviour is characteristic of ferritic heating resistance alloys.

So-called reactive elements such as zirconium (Zr), yttrium (Y), cerium (Ce), hafnium (Hf) or lanthanum (La) can be added to the alloys in small quantities to improve the stability and adhesion of the oxide layer.

BGH FecroTHERM 25-5

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Material designation

DIN EN 1.4765
UNS K92500

Properties

BGH FecroTHERM 25-5 is a ferritic iron-chromium-aluminium alloy (FeCrAl) which, due to the formation of a stable Al₂O₃ layer, is particularly suitable for use in high-temperature applications above 1000 °C. BGH FecroTHERM 25-5 is characterised by high scale resistance, high electrical resistance and excellent corrosion resistance in chemically demanding environments with oxidising, sulphurous or carburising atmospheres. BGH FecroTHERM 25-5 is magnetic up to approximately 600 °C and is suitable for applications with operating temperatures of up to 1400 °C.