FURNACES FOR ELECTRICAL STEELS
ELTERMA S.A. Seco/Warwick Group Poland manufactures a wide variety of furnace systems for
transformer core annealing, laminations annealing, bluing and lamination annealing & blue
processes. For batch or continuous operations, ELTERMA S.A. provides quality roller hearth,
pusher, mesh belt, bell and elevator furnace systems with PC/PLC control systems that provide
precision temperature control and process fl exibility.
Characteristics of Electrical Steels
The conversion of electrical energy from one voltage to another
voltage by use of a transformer or into mechanical energy by use
of a motor requires establishment of a strong concentrated
magnetic field. This concentration and strength is obtained by
the use of ferro-magnetic steel containing silicon or steels which
have had carbon content reduced to less than 0,01%.
Transformer Core Annealer
Decarburized steel has the approximate magnetic qualities of
AISI-M36 , and is generally applied in fractional and small integral
horsepower motors. Silicon steels are used primarily in high
efficiency equipment with grain oriented silicon steels being used
in the highest efficiency equipment.
Grain growth is generally promoted in all classes of electrical
steels to improve magnetic qualities by reducing the number of
grain boundaries. The magnetic qualities of various steels are
determined by Epstein tests on samples tested for energy loss
and permeability.
Bell Furnace Installation for batch
transformer core annealing
Electrical Steels
The performance of a steel in an electro-magnetic circuit is
measured by eddy current and hysterisis losses, and
permeability. All of these parameters are affected by the heat
treatment given to the steel during the course of its fabrication
into a magnetic structure. The presence of carbon sulphur,
oxygen and nitrogen in the steel increase eddy current and
hysterisis losses while lowering permeability. Carbon is by far the
most deleterious element, and heat treatment is therefore
aimed at reducing carbon levels. In-processing annealing, in
addition to removing strains set up by cold working, also reduces
carbon levels by carrying out the annealing cycle in a
decarburizing atmosphere. Hysterisis losses are decreased and
permeability is increased. Carbon levels can be reduced from
0,08% to less than 0,01% us AISI1008 steel. Eddy current
losses vary with lamination thickness and lamination coatings.
Continuous Lamination Annealer
WE BRING THE WORLD THE COMPLETE SOLUTIONS IN THE FIELD OF EQUIPMENT FOR HEAT TREATMENT OF METALS