Product selection guide
About ArcelorMittal
ArcelorMittal: transforming tomorrow
Global presence
A dedicated commercial office close to your region
Service offered by our steel service centres
Technical support by R&D
Products
Non-oriented electrical steels (NO)
Grain-oriented electrical steels (GO)
Varnishes for electrical steels (VA)
Transformer cores (TC)
12
14
16
8
10
4
6
20
40
42
44
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This selection guide will help you select the best ArcelorMittal steel grade for your particular application:
• Non-oriented electrical steels (NO)
• Grain-oriented electrical steels (GO)
Having identified your particular market, you can select your type of application in the table below.
Alongside each application you will find a reference to the product data sheet we recommend.
Further in this guide, you will find the product data sheets with a general description for each product:
• Main properties
• Advantages
• Applications
• Recommendations for use
• Feasibility tables
Domestic appliances
Small domestic appliances Microwave oven transformers
Motors
Laundry & dishwashers
Refrigeration
Transformers
Motors
Compressor motors
Reference
NO1 NO2
NO1 NO5 NO7
NO1
NO5
NO5
Mechanical engineering
Railways
Marine engineering
Heavy wheeled vehicles
Automotive
Traction
Traction motors
Self-induction coils
Propulsion engines
Mining trucks wheel motors
Alternators
Electrical and hybrid vehicle traction motors and alternators
Wheel hub motors
NO1 NO2
NO1 GO1
NO1 NO2
NO1 NO2
NO6
NO1 NO2 NO3
NO1 NO2

Aeronautics & military
Lighting
Cold storage
Building industry
Lighting
Cold storage
Ballasts
Compressor motors
Reference
NO1 NO2
NO1 NO5
Ballasts
Compressor motors
NO1 NO2
NO1 NO5
Industry
Ventilation / airco
Electrical equipment
Industrial motors
Generators
Wind power
Hydro or turbine power stations
Motors for air fans
Low-voltage transformers
Welding equipment transformers
Contactor cores
Electricity meter cores
Micro-motors
Shielding of power lines and transformers for the distribution of electrical power
Shielding of electrolysis cells
Electromagnets
Current and potential transformers
Power transformers
Distribution transformers
Medium-power motors
High-power motors
Medium-power generators
Medium- and high-power generators
Medium- and high-power generators
Reference
NO1 NO5
NO1
NO1
NO1
NO1
NO3
NO1 NO2
GO1
NO1
NO1 NO2 GO1
GO1
GO1
NO1 NO2 NO5 NO6
NO1 NO2
NO1 NO2
NO1 NO2
NO1 NO2 NO8 NO9
GO1
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ArcelorMittal is the world’s largest and most global integrated steel company. It has led the consolidation of the world steel industry and today ranks as the only truly global steelmaker.
ArcelorMittal is the number one supplier in all major global markets, including automotive, construction, domestic appliances and packaging. Its industrial presence in Europe, Asia,
Africa and America gives the Group exposure to all the key steel markets, from emerging to mature – an exposure it continues to enhance through its three dimensional growth strategy of product diversity, geographical reach and vertical integration.
Innovation and cooperation
Innovation plays a key role at ArcelorMittal.
Not only is it the largest steelmaker by volume but ArcelorMittal also offers the broadest range of steel grades, advanced products, steel solutions and cutting-edge technologies.
Close cooperation with customers – involving mutual trust, an open-minded approach and permanent exchanges of personnel – further drives innovation and assists in the development of products and solutions that sustain their competitive edge.
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We know that our position in the steel industry brings unique responsibilities.
We are committed to setting globally recognised standards with the needs of future generations in mind.
Our goal is to provide the leadership that will transform tomorrow’s steel industry. We have a clear vision of the future, underpinned by a consistent set of values:
Quality
We look beyond today to envision the steel of tomorrow.
Because quality outcomes depend on quality people, we seek to attract and nurture the best people to deliver superior solutions to our customers.
Sustainability
We are guiding the evolution of steel to secure the best future for the industry and for generations to come.
Our commitment to the world around us extends beyond the bottom line, to include the people in whom we invest, the communities we support and the world in which we operate. This long-term approach is central to our business philosophy.
Leadership
We are visionary thinkers, creating opportunities every day.
This entrepreneurial spirit brought us to the forefront of the steel industry. Now, we are moving beyond what the world expects of steel.
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.
Electrical steels production plants
ArcelorMittal Eisenhüttenstadt
ArcelorMittal Florange
ArcelorMittal Fos-sur-Mer
ArcelorMittal Frýdek-Místek
ArcelorMittal St Chély d’Apcher
ArcelorMittal Indiana Harbour Works
.
Steel service centres
ArcelorMittal Distribution Solutions Italia, Monza
ArcelorMittal Distribution Solutions Italia, Marcon
ArcelorMittal Distribution Solutions France, Reims
ArcelorMittal Distribution Solutions Spain, Lesaka
ArcelorMittal Distribution Solutions Germany,
Eisenhüttenstadt
ArcelorMittal Gonvarri SSC Slovakia, Senica
NO
GO
NO
Products*
NO
NO
CRML
Germany
France
Online information on www.arcelormittal.com/fce www.arcelormittal.com/fce
France www.arcelormittal.com/fce
Czech Republic www.arcelormittal.com/fce
France www.arcelormittal.com/fce
USA www.arcelormittal.com
Italy
Italy
France
Spain
Germany
Slovakia
Online information on www.arcelormittal.com/dsitaly www.arcelormittal.com/dsitaly www.arcelormittal.com/dsfrance www.arcelormittal.com/dsiberia www.arcelormittal.com/dsgermany www.arcelormittalgonvarri.sk
� Research centres
ArcelorMittal Global R&D Gent (OCAS)
ArcelorMittal East Chicago
/ Transformer cores production plant
ArcelorMittal Technotron s.r.o.
Products*
NO/GO
CRML
Belgium
USA
Online information on www.ocas.be
www.arcelormittal.com
Online information on
Czech Republic www.technotron.cz
*
NO: Non-oriented electrical steels
CRML: Cold rolled motor laminations
GO: Grain-oriented electrical steels

Electrical steels production plant .
Steel service centre .
Research centre �
Transformer cores production plant /
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Electrical steels: central commercial offices
Europe
North America
Location
France (Paris)
USA (Chicago)
Other regions Luxembourg
Address
5, rue Luigi Cherubini,
F-93212 La Plaine Saint-Denis (Paris) - France
One South Dearborn Street
Chicago IL, 60603 USA
Toll free phone: 1-800-422-9422
19, avenue de la Liberté,
LU-2930 Luxembourg
E-mail benoit.genet@arcelormittal.com
patrick.faucard@arcelormittal.com
v.garg@arcelormittal.com

Electrical steels: central commercial office .
Electrical steels: local commercial office .
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The steel service centres within ArcelorMittal
Distribution Solutions offer a wide range of activities and services for electrical steels:
Activities
• Slitting coils in all possible widths
• Cutting sheets to length
• Punching laminations, either as such or assembled into stacks, with or without thermal post-treatment
• Applying a cupper winding or injecting aluminium into the rotor or stator slots
• Fitting of axles into the machines
Service
ArcelorMittal Distribution Solutions can provide customers with the magnetic, mechanical and thermal properties of the magnetic materials used.
Backed up by ArcelorMittal Group expertise in electrical steels, the steel service centres are able to provide a wide range of 'tailor-made' solutions as well as 'just-in-time' deliveries.
In addition, the steel service centres also offer customers assistance in selecting the best material and process for their application.
For the locations of the steel service centres, see page 10.
For further information about the product range and the service offered, please consult the overview of the commercial contacts on page 12.
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ArcelorMittal R&D has proven experience in:
• Modelling and design of electromagnetic systems
• Optimised electrical steel grade selection
• Advanced material characterisation techniques
• Tailor-made magnetic measurement tools for laboratory or production line
Improve your efficiency
ArcelorMittal R&D validates numerical simulations by comparing these with the results of in-house experiments. Our laboratories are fully equipped to assess the electromagnetic properties of your materials or magnetic cores. In addition to standard measurements based on Epstein frames and single sheet testers, we can perform advanced characterisation using your specific magnetic circuit or your excitation conditions
(PWM, harmonics etc).
Our engineers and researchers have experience in modelling electromagnetic behaviour of electrical machines, transformers or other systems.
ArcelorMittal R&D has many years of experience in optimising designs, providing cost saving solutions with enhanced efficiency.
ArcelorMittal R&D can deliver a detailed report listing all simulations and experiments as well

as a clear interpretation of results obtained and recommendations for further improvement.
We help you, for example, to identify the best combination between the electrical steel grade and your equipment design, resulting in lower energy dissipation and enhanced permeability at reduced cost.
Easy monitoring of your product performance and rapid quality control
ArcelorMittal R&D can supply standard or tailormade advanced magnetic measuring systems
(AMMS) available in different configurations:
• 'AMMS Lab' for laboratory testing
• 'AMMS Online' for continuous characterisation of electromagnetic properties of steel strip
All devices ordered include on-site installation, training and maintenance plan.
ArcelorMittal R&D offers a full package of R&D services
In addition to our co-design and co-engineering services in the field of electrical machinery,
ArcelorMittal R&D also offers:
• R&D partnership
• Rapid prototyping
• Problem solving
• Metallurgical processing
• Material characterisation
• Training
We offer advanced technology and innovative research within a framework of confidentiality.
Your benefits:
Full range of services
• Co-development of new products based on combining optimised design and selection of the most appropriate electrical steel grade
• Advanced material characterisation methods in our laboratory
• Cost saving numerical finite element modelling of electromagnetic behaviour of your applications (large materials database with for example magnetic properties)
• Quality control by means of advanced magnetic measurement systems
Proven materials expertise
• Extensive knowledge of electrical steel grades, grain-oriented and non-oriented
• Expertise in various fields of application: power generation, asynchronous machines, permanent magnet applications, electromagnetic valves and actuators, automotive applications, transformers
Skilled staff and top class equipment
• In-house laboratory assessment tools
• Associated technologies, including advanced characterisation techniques in the field of chemistry and physical testing
For an overview of the ArcelorMittal R&D centres in this area, see the overview on page 10.
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Non-oriented electrical steels (NO)
NO1 Fully processed standard grades
NO2 Fully processed high permeability and high thermal conductivity grades
NO3 Fully processed high frequency grade
NO4 Fully processed high strength grades
NO5 Semi-processed grades, including Cold Rolled Motor Laminations
NO6 Semi-processed high permeability grades
NO7 Easy Punch steels with guaranteed punchability
NO8 Cold rolled pole sheet grades
NO9 Hot rolled pole sheet grades
Grain-oriented electrical steels (GO)
GO1 Grain-oriented standard grades 40
Varnishes for electrical steels (VA) 42
28
30
32
34
20
24
26
36
38
Transformer cores (TC) 44
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NO1
20
To supply the required level of traction for this huge mining truck, four electrical motors are needed: one for each wheel.

Non-oriented electrical steels
NO1
Fully processed electrical steels as delivered have guaranteed magnetic properties. These are obtained through careful selection of the most appropriate alloying content – in particular silicon – in combination with the most suitable thermomechanical production processes.
ArcelorMittal’s state-of-the-art production facilities are equipped with in-line magnetic measurement systems, for optimal process control.
As well as the maximum loss and minimum polarisation data cited by the standards,
ArcelorMittal supplies full magnetic characterisation curves regarding losses, polarisation, permeability and apparent power at different frequencies. Other machine design parameters such as mechanical properties at different temperatures and thermal behaviour are also available on request.
Advantages
A full range of these standard grades is available, so that a steel grade can be selected according to the specific requirements of each application, from low alloy grades offering the advantage of excellent magnetic permeability, thermal conductivity and punchability to alloyed grades offering the advantage of very low losses, even at higher frequencies.
A wide range of coatings is available, allowing further enhancement of punchability, reduction of interlaminar losses and improvement of corrosion protection.
Applications
Fully processed steels are designed for the manufacture of magnetic circuits for motors, transformers and other electrical equipment.
The principal applications are in the electrical engineering, domestic appliance, automotive and building industries.
The thin lowest loss grades such as the
M230-30A, M210-35A or the M230-35A are of particular interest for high-efficiency or high-power density machines. For high-speed machines in particular, optimal compromises between mechanical strength and low eddy current losses have been worked out.
Thicker low loss grades are the choice for large power generators: their high utilisation rate demands the highest possible machine efficiency
(hence low losses), with reasonable punching and assembly costs (hence 0.65 mm or
0.50 mm thickness).
Thanks to the low coercive field and remanence level of low loss fully processed grades, these steels also are preferred for the production of contactors.
Low loss fully processed steels are also beneficial for shielding applications at low frequencies.
Recommendations for use
The properties mentioned above are obtained without heat treatment after stamping. The material as supplied possesses all the required magnetic properties.
>> See next page for the feasibility tables.
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NO1
feasibilities
Thickness
Grades
EN 10106:2007
0.30 mm 0.35 mm 0.50 mm 0.65 mm
M230-30A M210-35A* M230-50A* M310-65A
M230-35A M250-50A M330-65A
M235-35A
M250-35A
M270-35A
M300-35A
M330-35A
M270-50A
M290-50A
M310-50A
M330-50A
M350-50A
M400-50A
M470-50A
M350-65A
M400-65A
M470-65A
M530-65A
M600-65A
M700-65A
M800-65A
M1000-65A M530-50A
M600-50A
M700-50A
M800-50A
M940-50A
Grades in italic: not included in the standard (yet)
* Available on request
1.00 mm
M600-100A
M700-100A
M800-100A
M900-100A
M1000-100A
M1300-100A
JIS C2552:2000
0.35 mm 0.50 mm
35A230
35A250
50A250
50A270
35A270
35A300
50A290
50A310
50A350
50A400
50A470
50A600
50A700
50A800
0.65 mm
65A800
65A1000

ASTM A 677/A677M:1999 (former AISI)
0.35/0.36 mm 0.47/0.50 mm 0.64/0.65 mm
36F145 (M15) 47F165 (M19) 64F200 (M19)
36F155 (M19) 47F180 (M22) 64F210 (M22)
36F165 (M22) 47F190 (M27) 64F235 (M36)
36F185 (M36) 47F200 (M36) 64F250 (M43)
47F210 (M43) 64F275 (M45)
47F240 (M45) 64F320 (M47)
47F280 (M47)
47F400
47F450
Not exact equivalences
IEC/CEI 60404-8-4:1998
0.35 mm 0.50 mm
M250-35A 5 M270-50A 5
0.65 mm
M235-35A 5 M250-50A 5 M310-65A 5
1.00 mm
M600-100A 5
M330-65A 5 M700-100A 5
M270-35A 5 M290-50A 5 M350-65A 5 M800-100A 5
M300-35A 5
M330-35A 5
M310-50A 5
M330-50A 5
M400-65A 5 M1000-100A 5
M470-65A 5
M350-50A 5 M530-65A 5
M1300-100A 5
M400-50A 5 M600-65A 5
M470-50A 5 M700-65A 5
M530-50A 5 M800-65A 5
M600-50A 5 M1000-65A 5
M700-50A 5
M800-50A 5
M940-50A 5
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NO2
feasibilities
No standards available
Thickness 0.35 mm 0.50 mm
Grades M330P-35A M330P-50A
M350P-50A
M400P-50A
M400XP-50A
M470P-50A
0.65 mm
M470P-65A

Non-oriented electrical steels NO2
The fully processed high permeability electrical steels have guaranteed magnetic properties significantly superior to the requirements of the standards, particularly regarding their polarisation and permeability levels.
The specific chemical composition of ArcelorMittal’s products and our thermomechanical processes result in enhanced structures and textures, which are the key to obtaining steep magnetisation curves with high saturation levels.
Full magnetic characterisation curves are available on request, as well as mechanical and thermal data. The thermal conductivity of these steels is higher than the conductivity of the fully processed standard grades, so the heat generated in the machine due to the losses can be more easily evacuated.
Advantages
The high permeability levels of these grades allow a reduction of the magnetising current required for a given air gap flux. This increases the efficiency of the machine and also makes it possible to increase its specific power rating, thereby reducing the machine's dimensions.
High thermal conductivity levels are important, since they facilitate heat evacuation from the machine.
A wide range of coatings is available, allowing further enhancement of punchability, reduction of interlaminar losses and improvement of corrosion protection.
Applications
High permeability is particularly useful for applications such as ballasts and motors, because it makes it possible to build machines that meet the most stringent environmental regulations. High efficiency induction motors
(e.g. IE3 efficiency = NEMA premium or even the top level IE4 super premium machines) can be achieved by increasing the amount of copper used, which generally leads to a larger machine, but the use of higher permeability grades can help to avoid this volume expansion.
High thermal conductivity is a significant advantage for large machines, where the heat balance can be a significant power limiting factor.
High thermal conductivity is a significant advantage for machines working at high frequencies, both for large industry motors as for automotive machines.
Recommendations for use
The properties mentioned above are obtained without heat treatment after stamping. The material as supplied possesses all the required magnetic properties.
These grades generate not only increased efficiency, but also a higher specific power rating, which is an important aspect for traction motors for locomotives, like this ICE-3 high-speed train.
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NO3
feasibilities
EN 10303:2001
Thickness 0.20 mm
Grades NO 20
IEC/CEI 404-8-8:1991
0.20 mm
NO 20
This type of electrical steel is mainly used when weight and volume reduction is essential, for instance in aeronautic or medical applications. The part shown here is used for a breathing aid.

Non-oriented electrical steels NO3
This fully processed high frequency grade has guaranteed magnetic properties in accordance with the standards for medium frequency applications, which specifically concerns thin electrical steels for use at frequencies above
100 Hz. The manufacture of such thin steels – down to 0.20 mm – is particularly demanding for the cold rolling process, especially because the magnetic performance requires a high silicon content, which render the material more brittle. ArcelorMittal’s production facilities are equipped with high performance gauge, tension and flatness control systems to meet this challenge.
The standards require guaranteed loss levels at 400 Hz, but ArcelorMittal can supply full magnetic characterisation curves at various frequencies. Furthermore, mechanical properties at different temperatures and thermal behaviour are available on request.
Advantages
High frequency electrical steels have very low loss levels, especially at high frequencies. These properties are a result of the thin gauge of this material (0.20 mm), its particular chemical composition and its specific thermomechanical processing.
We offer this grade with a C5 coating, for its excellent behaviour at high temperatures, which will also allow machine repairs, and for its insulating properties.
Applications
This grade is designed for high-speed rotating machines (100 to 5 000 Hz). It allows minimisation of losses due to higher harmonics and clearly increases machine efficiency in the case of non-sinusoidal power supply.
This thin, fully processed grade is also used when weight and volume reduction are of major importance, such as in medical or aviation applications.
The higher speed applications are also more demanding in terms of mechanical behaviour, which is why our NO 20 grade has been optimised both for yield strength and for eddy current behaviour.
Recommendations for use
The properties mentioned above are obtained without heat treatment after stamping. The material as supplied possesses all the required magnetic properties.
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NO4
feasibilities
No standards available
Thickness 0.50 mm 0.65 mm
Grades M470YS-50A M530YS-65A
High strength values, combined with good magnetic properties, make these grades particularly suitable for high-speed rotating machines.

No standards available
Thickness 0.50 mm 0.65 mm
Grades M470YS-50A M530YS-65A
Non-oriented electrical steels NO4
Fully processed high strength grades have not only guaranteed magnetic properties but also guaranteed mechanical properties. A typical characteristic of these grades is the higher strength values compared to the standard grades, both at room temperature and at higher temperature operating conditions. These are obtained through adequate modifications in
ArcelorMittal’s fully processed electrical steel production process, resulting in an optimal combination of magnetic and mechanical performance.
Full magnetic characterisation curves at different frequencies as well as thermal behaviour data are available on request.
Advantages
These high strength grades withstand stronger mechanical forces than the standard grades.
They are therefore an excellent compromise when a combination of high mechanical strength and low magnetic losses is required.
A wide range of coatings is available, allowing further enhancement of punchability, reduction of interlaminar losses and improvement of corrosion protection.
Applications
The high strength values, combined with low losses and good permeability, make these grades particularly suitable for high-speed rotating machines. The yield strength is a particularly important property when the teeth have to withstand both strong electromagnetic forces and the mechanical forces resulting from high-speed operation. Rotors with imbedded permanent magnets in synchronous machines and the teeth of machines with concentrated windings will also benefit from higher mechanical strength.
Recommendations for use
The properties mentioned above are obtained without heat treatment after stamping. The material as supplied possesses all the required magnetic properties.
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NO5
feasibilities
Thickness 0.50 mm
Grades
EN 10341:2006
M340-50K
M390-50K
0.65 mm
M390-65K
M450-65K
0.70 mm 0.80 mm 1.00 mm
M1000-70K M1200-80K M1300-100K
M1800-100K
M450-50K
M560-50K
M660-50K
M890-50K
M520-65K
M630-65K
M800-65K
M1000-65K
M1050-50K M1200-65K
Grades in italic: not included in the standard (yet)
Thickness 0.50 mm
Grades
IEC/CEI 60404-8-3:2005
0.65 mm
M340-50K5 M390-65K5
M390-50K5 M450-65K5
0.70 mm 0.80 mm 1.00 mm
M1000-70K5 M1200-80K5 M1300-100K5
M1800-100K5
M450-50K5 M520-65K5
M560-50K5 M630-65K5
M660-50K5 M800-65K5
M890-50K5 M1000-65K5
M1050-50K5 M1200-65K5
Grades in italic: not included in the standard (yet)
ASTM A683/A726:2005
0.47/0.50 mm 0.56 mm 0.64/0.65 mm 0.71/0.70 mm 0.79/0.80 mm
47S190/47D190 56D260 64S220
47D215 56D310 64S230
71D410
71D480
79D450
79D540
79D610 47D270 56D380
47D330
47D380
64D260
64D290
64D360
64D430
71D550
64D490
Not exact equivalences; other CRML gauges and loss/perm levels available
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Non-oriented electrical steels NO5
As delivered, semi-processed electrical steel grades do not have guaranteed magnetic properties. After the laminations are punched, they need to be heat-treated by the customer to develop their magnetic properties.
This final annealing treatment reduces losses and improves permeability and polarisation, as a result of recrystallisation, grain growth and for certain grades also decarburisation.
The semi-processed standards describe reference annealing cycles which allow the development of these properties. These reference cycles are applied in ArcelorMittal’s labs to validate the ability of our materials to achieve the required magnetic performance.
Advantages
The punchability of the semi-processed grades has been optimised by the application of an optimised final skin-pass reduction, after the cold rolling and annealing process.
Skin-passing produces a controlled surface roughness, ensuring good material behaviour in the punching presses. This roughness also prevents the strips from sticking during the client's final annealing treatment. Regarding magnetic performance, skin-passing also plays an important role by stimulating grain growth during the annealing process.
These semi-processed grades are available non-insulated. The final process step of the
(decarburising) annealing treatment carried out by the client provides a suitable atmosphere and the right thermal conditions for blueing: the formation of an oxide film, which creates the required surface insulation layer.
Applications
Non-alloyed semi-processed electrical steels are designed for small industrial motors, fans and domestic appliances such as washing machine motors, microwave oven transformers and refrigerator compressors.
Alloyed semi-processed electrical steels are designed for similar higher efficiency versions of these applications, as they have lower losses while the permeability remains at a good level.
Recommendations for use
The punching process needs to be carried out with an appropriate lubricant, which must be selected carefully, especially in the case of the alloyed semi-processed grades.
These steels are designed for domestic appliances (e.g. washing machine motors), small industrial motors, fans and this electric drill.
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NO6
feasibilities
No standards available
Thickness 0.50 mm
Grades M450P-50K
M560XP-50K
0.65 mm
M600P-65K
M700XP-65K
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These high permeability grades have been proven to enhance the efficiency of industrial motors.

Non-oriented electrical steels NO6
Semi-processed high permeability grades have guaranteed superior magnetic properties compared to the standard semi-processed grades, especially at 45° to the rolling direction.
As for the standard semi-processed grades, the high permeability grades need a final annealing treatment, carried out by the client after punching the laminations.
Advantages
The semi-processed high permeability grades allow core weight reduction and increased efficiency of motors and transformers.
The improved efficiency achieved reduces machine operating costs and at the same time makes them more environmentally friendly.
Applications
These grades are designed for motors, generators, transformers, converters and ballasts where higher efficiency is required.
These are available in four grades: the 0.50 mm types are called M450P-50K and M560XP-
50K and the 0.65mm types M600P-65K and
M700XP-65K.
Recommendations for use
(only valid for XP grades)
Considering the very high polarisation level of these semi-processed high permeability grades at an angle of 45° to the rolling direction, it is preferable to design the punching process in such a way that the direction of magnetisation of the part is as nearly parallel as possible with this 45° direction.
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34
NO7
feasibilities
No standards available
Thickness 0.5-1.2 mm
Grades Easy Punch

The Easy Punch grade has guaranteed mechanical properties and roughness.
Magnetic properties are not guaranteed, as they are not optimised in this product.
Should the application require enhanced magnetic performance, other electrical steel grades in ArcelorMittal’s product range are recommended.
Non-oriented electrical steels NO7
Advantages
This Easy Punch grade has excellent punchability and stackability, thanks to appropriate mechanical properties and roughness. It is therefore eminently suitable for automatic stacking and assembling techniques. The excellent punchability is achieved by means of a final skin-pass treatment, which produces high
R e
/R m
values (typically over 0.9). Easy Punch also has excellent weldability.
Applications
The Easy Punch grade is designed for small machines for intermittent use:
• Automotive equipment such as alternators, windscreen wipers, window-opening motors
• Small domestic appliances such as coffee grinders, mixers
• Small hand tools such as drills
Recommendations for use
The punching process needs to be carried out with an appropriate lubricant.
Usually, the client does not perform heat treatment after punching. Heat treatment is an option to increase the magnetic performance of
Easy Punch.
The Easy Punch grade is designed for excellent punchability and stackability, ideal for this alternator.
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36
NO8
feasibilities
EN 10265:1995
Thickness 0.65 mm 1.00 mm
Grades 250-65-TF 183 250-100-TF 183
300-65-TF 182 300-100-TF 182
350-65-TF 181 350-100-TF 181
400-65-TF 180 400-100-TF 180
JIS C2555:2000
0.65 mm 1.00 mm
PCYC 250
PCYC 300
PCYC 350
PCYC 400
PCYC 250
PCYC 300
PCYC 350
PCYC 400
IEC/CEI 60404-8-5:1989
0.65 mm 1.00 mm
250-65-TF 183 250-100-TF 183
300-65-TF 182 300-100-TF 182
350-65-TF 181 350-100-TF 181
400-65-TF 180 400-100-TF 180
The cold rolled pole sheet grades are designed for large high-speed machines because of their excellent combination of mechanical strength and magnetic performance, which makes them ideal for industrial applications.

Non-oriented electrical steels NO8
Cold rolled pole sheet grades are classified according to their yield strength as described by the standards. As well as guaranteed mechanical properties, they have guaranteed magnetic properties, but unlike other electrical steel grades, their magnetic properties are determined under direct current (DC) conditions.
Full magnetic characterisation curves in DC and also at various frequencies are available on request, as well as thermal data.
Advantages
High yield strength values allow these grades to withstand strong electro-mechanical forces.
As well as excellent DC magnetic properties significantly superior to the requirements of the standard, these grades perform well on loss and induction levels at 50 Hz AC conditions, thanks to a special chemical composition.
A wide range of coatings is available, allowing further enhancement of punchability, reduction of interlaminar losses and improvement of corrosion protection.
Applications
Cold rolled pole sheet grades are designed for large high-speed machines because of their excellent combination of mechanical strength and magnetic performance.
Recommendations for use
The properties mentioned above are obtained without heat treatment after stamping. The material as supplied possesses all the required magnetic properties.
37

NO9
feasibilities
Grades
EN 10265:1995
Thickness 1.5-5.0 mm 2.0-5.0 mm 2.5-5.0 mm
250-...-TG 180 400-...-TG 179 600-…-TG 178
300-...-TG 180 450-…-TG 179 650-…-TG 178
350-...-TG 179 500-…-TG 179 700-…-TG 178
550-…-TG 178
JIS C2555:2000
1.5-5.0 mm 2.0-5.0 mm
PCYH 250
PCYH 300
PCYH 400
PCYH 450
PCYH 350 PCYH 500
PCYH 550
2.5-5.0 mm
PCYH 600
PCYH 650
PCYH 650
IEC/CEI 60404-8-5:1989
1.5-5.0 mm 2.0-5.0 mm 2.5-5.0 mm
250-...-TG 180 400-...-TG 179 600-…-TG 178
300-...-TG 180 450-…-TG 179 650-…-TG 178
350-...-TG 179 500-…-TG 179 700-…-TG 178
550-…-TG 178

Non-oriented electrical steels NO9
Hot rolled pole sheet grades are classified according to their yield strength as described by the standards. As well as guaranteed mechanical properties, they have guaranteed magnetic properties, but unlike other electrical steel grades, their magnetic characterisation is determined under direct current (DC) conditions.
Advantages
High yield strength values allow these grades to withstand strong electro-mechanical forces.
The DC magnetic properties are excellent and significantly superior to the requirements of the standard.
Hot rolled pole sheet grades are available noninsulated. They can be supplied in a hot rolled or pickled version.
Applications
Hot rolled pole sheet grades are designed for large high-speed machines because of their excellent combination of mechanical strength and good magnetic performance. Good magnetic properties are of major importance for the performance of the poles, whereas excellent mechanical properties are needed for the rims.
Recommendations for use
The properties mentioned above are obtained without heat treatment after stamping. The material as supplied possesses all the required magnetic properties.
Transformers benefit optimally from the excellent longitudinal magnetic properties of grain-oriented electrical steels.
39

40
GO1
feasibilities
Thickness
Grades
EN 10107:2005
0.23 mm
M110-23S
M120-23S
0.27 mm
M114-27S
M120-27S
0.30 mm
M120-30S
M130-30S
M127-23S M130-27S
M140-27S
M140-30S
M150-30S
Grades in italic: not included in the standard (yet)
0.35 mm
M130-35S
M140-35S
M150-35S
M165-35S
Thickness
Grades
ASTM A876:2003 (former AISI)
0.23 mm 0.27 mm
23H070 (M3) 27H074 (M4)
0.30 mm 0.35 mm
30H083 (M5) 35H094 (M6)
23G045 (M3) 27G051 (M4) 30G058 (M5) 35G066 (M6)
Not exact equivalences
JIS C2553:2000
0.23 mm 0.27 mm
23G110 27G120
27G130
Not exact equivalences in 0.35 mm
0.30 mm
30G130
30G140
0.35 mm
35G145
35G155
IEC/CEI 60404-8-7:2008
0.23 mm
M110-23S5
M120-23S5
M127-23S5
0.27 mm
M114-27S5
M120-27S5
M130-27S5
M140-27S5
0.30 mm
M120-30S5
M130-30S5
M140-30S5
M150-30S5
0.35 mm
M130-35S5
M140-35S5
M145-35S5
M150-35S5
M155-35S5
M165-35S5
Not exact equivalences in 0.35 mm
Grades in italic: not included in standard (yet)
Transformers benefit optimally from the excellent longitudinal magnetic properties of grain-oriented electrical steels.

JIS C2553:2000
0.23 mm 0.27 mm
23G110 27G120
27G130
Not exact equivalences in 0.35 mm
0.30 mm
30G130
30G140
0.35 mm
35G145
35G155
IEC/CEI 60404-8-7:2008
0.23 mm
M110-23S5
M120-23S5
M127-23S5
0.27 mm
M114-27S5
M120-27S5
M130-27S5
M140-27S5
0.30 mm
M120-30S5
M130-30S5
M140-30S5
M150-30S5
0.35 mm
M130-35S5
M140-35S5
M145-35S5
M150-35S5
M155-35S5
M165-35S5
Not exact equivalences in 0.35 mm
Grades in italic: not included in standard (yet)
Grain-oriented electrical steels GO1
ArcelorMittal grain-oriented electrical steels are produced to achieve low core losses and high magnetic permeability.
These are obtained through a tight control of the
ArcelorMittal production process, designed to streamline the strength of the Goss texture.
The combination of an optimal texture and structure allows obtaining excellent typical magnetic properties.
Grain-oriented electrical steels are mainly used in highly efficient transformers and generators due to its excellent magnetic properties in the rolling direction.
Advantages
The use of grain-oriented steel in transformers is advantageous thanks to the very low core loss in the rolling direction. This means more efficient transport of energy from the production site to the consumption site.
These standard grades are available in a range of thicknesses and loss levels, enabling customers to select the most appropriate grade to meet the specific requirements of each application.
ArcelorMittal’s high quality products range from
0.35 mm thickness up to 0.23 mm and are supplied with coating ASTM C5 over ASTM C2 to ensure high electrical resistance.
Applications
The main application of grain-oriented steel is in the core of transformers (power, distribution, current etc), used for transmission and distribution of electrical energy. These steels are also used for hydro- and turbogenerators for the generation of electrical energy.
The use of grain-oriented steels in this type of equipment improves their efficiency, contributing to the reduction of energy losses in the electrical system.
Recommendations for use
For wound cores, ArcelorMittal recommends applying a stress relief annealing treatment.
It is important to remove oil, grease or any organic compound to prevent carbonisation of the electrical steel. Maximum care during handling is desirable to avoid re-introduction of stresses.
The properties mentioned above are measured either by Epstein or SST measurement equipment. The standards specify that stress relief annealing should be applied after the samples have been cut, depending on the measuring device.
41

VA
feasibilities
Coating type
IEC/CEI 60404-1-1:2004
EN 10342:2005
EC-3
EC-5-N
EC-5-G
EC-6
Typical gauges
ASTM (per side)
C-3 1 - 4 µm
C-5 1 - 4 µm
C-5 2 - 4 µm
C-6 2 - 10 µm
Functionality
The resins' chemical composition yields special advantages such as a high elasticity and a very strong adhesion. A coating thickness of less than 1 µm generates the additional advantage of excellent weldability, whereas a varnish of 4 µm and above assures good interlaminar insulation.
This varnish was designed to maintain its dielectrical properties during the repair of damaged copper windings. Additionally, the mineral part of the coating provides high thermal conductivity. The combination of resins and mineral products achieves a good compromise between punchability and weldability.
This varnish is selected to have good adherence and to withstand normal punching and cutting operations. It does not affect and is unaffected by transformer oil.
The mineral elements have been selected to reduce punching tool wear and favour punching oil retention. They also enhance the rigidity of the varnish, which minimises dimensional changes under high pressure/temperature. This varnish is particularly recommended for use with contactors, to permit a higher flutter frequency whilst reducing noise.
The main purpose of varnish is to provide interlaminar insulation and to improve punchability of the steels.

Non-oriented and grain-oriented electrical steels
VA
Electrical steel varnishes for non-oriented are designed to enhance the behaviour of fully processed electrical steels. Their major impact is to provide interlaminar insulation and to improve the punchability of the steels. Each type of varnish has its specific properties: insulation level, punchability effect, corrosion protection, temperature resistance and weldability, hence it is the material used that determines the optimal varnish selection.
Advantages
The EC-3 type varnish is based on synthetic resins, resulting in a varnish with excellent lubricating properties for the punching process: the coated sheet can be punched without the need of an additional lubricant. It is particularly recommended with automatic stacking processes.
For grain-oriented grades, the main purpose is to provide increased surface insulation resistance, by means of a thin inorganic coating.
This type 5 coating (EC-5-G) is applied on top of the glass film (type 2), which is obtained in the high temperature annealing process step as a result of the reaction of the steel surface with the annealing separator.
The EC-5-N type varnish (for non-oriented) is a pigmented varnish, made with thermostable resins, mineral products and pigments. The type of mineral products and the amount used have been selected to obtain a coating with excellent temperature resistance during lengthy thermal treatments, which is of particular interest where stress relieving annealing is required after punching.
The EC-5-G type varnish (for grain-oriented) is a pigmented varnish, predominantly composed of phosphates. As well as its electrical insulation properties, this coating has the advantage of withstanding stress-relief annealing, which restores the magnetic properties of grainoriented steels at the cut edges, for optimum steel performance.
The EC-6 type varnish is also a pigmented varnish, but especially suitable for high power rotating machines, thanks to its high electrical insulation level. This varnish is particularly recommended for use with contactors, to permit a higher flutter frequency whilst reducing noise.
Applications
These coatings are used for fully processed grades, as well as for pole sheets in the cold rolled version, in a wide range of electrical applications such as rotating machines, transformers and contactors.
The coatings used for grain-oriented fully processed grades are particularly used for power transformers, which require high efficiency and operate continuously. For these applications it is important to have a double coating system, with the phosphate layer on top of the glass film.
Recommendations for use
The raw materials used have a chemical composition – both in liquid and cured varnish state – which does not require specific protective measures during the processing of the coated steels or during use in a given application.
43

TC01
Cores of magnetic circuits constitute a very important part for transformers production and their quality is crucial for the final parameters of a magnetic circuit.
A transformer core consists of a magnetic circuit where its induction flux, caused by the current passage flowing through the primary coiling, induces electric voltage in the secondary coiling.
Wound transformer cores are used as compact cores (toroids) or as cores with air gaps.
ArcelorMittal Technotron s.r.o. produces cores from grain-oriented transformer metal band with silicium-alloyed Goss texture of about 3% and a thickness range from 0.15 to 0.35 mm.
General specification used material for processing according to IEC 60404-1:2000.

Application possibilities of toroidal cores
• Measurement transformers
• Power and regulating transformers
• Inductors
• Transducers
Advantages of toroidal cores
• Close flux path
• Low magnetic leakage
• Low humming
• Compact dimensions
• Light weight
Transformer cores TC01 feasibilities
5h
Dimension
D-outer diameter
D-inner diameter
H-core height
Sh-chamfered edge*
Min. (mm)
27
17
10
2x45
* at customer request
Max. (mm)
800
500
180
5x45 d
D h
Quality
N-normal
S-standart
SU-super
SU-EX-extra
Typoval values Max
(T)* Heff=3 A/m
0.050
0.075
Guaranteed values max (T) Heff=30 A/m min 1.3
min 1.4
0.110
min 1.6
0.130
* typical values at customer request
** colour marking – at customer request min 1.7
Colour marking** black red green white
45

TC01
feasibilities
Wound transformer cores are manufactured in the process of winding up the transformer strip on a mandrel followed by the processes of cutting the hot-manufactured and synthetic resin-bond core. A wound cores shape is better adapted for cores of the magnetic induction current and the structure of material grain is used more effectively when compared with cores composed of sheet stampings of various shapes.
Cut cores are assembled with a certain air gap between the pieces, insulation pieces are placed in these gaps during the assembly of the cores.
Cut surfaces of these cores can be round, oval and rectangular.
Advantages of Cut C cores
• Electrical energy saving thanks to low specific iron Watt losses
• Saving in quantity of used copper for winding thanks to smaller dimensions and weight of cut cores
• Saving in work costs exert for transformers assembly thanks to easy assembly
• Low humming
Core type*
C 8001-10000
C 10001-26003
C 26004-90005
Max. specific losses p
[W/kg]
1,5/50
2.5
2.2
2.2
* manufactured from M165-35S
Core type*
SG=Q
SU=U
SE=R
SM=M
Core type*
SG=Q
SU=U
SE=R
SM=M
Max. magnetic field density H at B 1,5 T [A/m] eff
400
350
300
Max. specific losses p
[W/kg]
1,7/50
2.2
2.2
2.2
2.2
* manufactured from M150-30S/M140-27S
Max. magnetic field density H at B 1,7 T [A/m] eff
265
265
265
265
Max. specific losses p
[W/kg]
1,7/50
1.9
1.9
1.9
1.9
* manufactured from M150-30S/M140-27S
Max. magnetic field density H at B 1,7 T [A/m] eff
125
125
125
125

Transformer cores TC01
feasibilities
Unicore cores constitute a new line of cores for magnetic circuits. This manufacturing technology was developed in 1997 and its aim was to simplify the existing technology and improvement of parameters of electrical machines. Due to advantages of their construction, unicore cores can replace almost all conventional C cores.
Unicore advanced technology leads to low specific losses. Their construction is simplified
– they don’t have to pass through the time- and cost-consuming production process which contributes to very favourable price and short delivery time. At assembly the existing types of coil forms can be kept as a result. No changes in the transformer construction are required.
Advantages of Unicore cores
• Low specific losses
• Easy assembly
• Favourable price
• Saving in quantity of used copper
• The banding of cores is not necessary
• Short delivery time
Core type
C 31002 (3.10 kg)
Finish annealed
C 31002 – DUO 02 UNICORE unannealed annealed
C 31002 – DUO 03 UNICORE unannealed annealed
150
150
450
60
240
H eff
A/m
110
260
140
370
45
1.70
1.50
1.70
1.50
1.70
B max.
T
1.50
1.70
1.50
1.70
1.50
Specific losses
W/kg
1.20
1.85
1.30
1.80
0.95
1.45
1.40
1.95
1.00
1.55
7.30
7.50
24.00
2.10
12.00
Input
VA/kg
5.10
13.90
6.50
19.50
1.90
47

TC01
Stacked cores are the most important part of distribution transformers. We produce these cores on modern production equipment and our cores have very low losses and noise level.
We are able to offer you a very wide range of lamination shapes.
We can offer you our cores assembled or not assembled with or without steel construction.
We have started production of these cores in
January 2011 and are able to offer you all types of transformer cores of grain-oriented material.

Advantages of stacked cores
• Reduction in core losses
• Easy assembly
Delivery options
• Assembled
• Non-assembled
Material used all type of SI steel
ArcelorMittal Technotron s.r.o.
Benefits of stacked cores:
-Reduction in core losses
-Easy assembly
Delivery options:
- assembled
- non assembled
Material used: all type of SI steel feasibilities
Our production range:
Thickness:
Our production range
Sheets centre-line length*
Thickness of 160 mm moving the 45`shears
Width min.
0,23 mm
250 mm max.
0,35 mm
2000 mm
0.23 mm 0.35 mm
40 mm 400 mm
Sheets centre-line length* 250 mm 2000 mm
Differences on strip width
*Minimum length 250 to 500 mm can be obtained up to max. width of 160 mm moving the 45`shears
+/-0.2 mm
0.02 mm
Length accurancy
Angle accuracy
Punching diameter
+/-0.1 mm
+/-0.01
10.5 mm
Transformer cores
Tolerances
Differences on strip width
Linearity on length = 1500 mm
Edge burr
Length accurancy
Angle accuracy
Punching diameter
TC01
+/-0.2 mm
0.8 mm
0.02 mm
+/-0.1 mm
+/-0.01°
10.5 mm
Possible shape combination
Possible Cross and Longitudinal Step Lap
Possible Cross and Longitudinal Step Lap
49

Credits for pictures
ArcelorMittal and:
Cover: Tom D'Haenens p. 2-38: Aperam South America p. 8: Philippe Vandenameele p. 14: Pauwels N.V. - Tom D'Haenens p. 16: ArcelorMittal Global R&D Gent p. 18: Eozen p. 20-24-28-36: Siemens p. 39: Voith p. 41: Pauwels N.V. - Tom D'Haenens p. 42: Philippe Vandenameele p. 44-49: ArcelorMittal Technotron s.r.o.
p. 51: Aperam South America
Copyright
All rights reserved. No part of this publication may be reproduced in any form or by any means without prior permission in writing.
Fully processed electrical steel was used to manufacture the hydro generator for the hydroelectric Tucuruí Dam in Brazil.