D24 - Fully processed high frequency grade
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.
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Available grades:
Properties
This non-oriented fully processed high frequency grade has guaranteed magnetic properties in accordance with EN 10303:2015, which specifically concerns thin electrical steels for use at frequencies above 100 Hz. Full magnetic characterisation curves at various frequencies 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 specific thermomechanical processing.
Applications
This grade is designed for high speed rotating machines (100 to 5000 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.
Recommendations for use
The above properties are obtained without heat treatment after stamping. The material as supplied possesses all the required magnetic properties.
Brand correspondence
Full table
| |
EN 10303:2015 |
ASTM A1086:2013 |
IEC/CEI 60404-8-8:1991 |
Old brand names |
| NO 20 |
NO 20-15 |
20T680 [15,0] |
NO 20 [15,0] |
|
NO 20
| |
NO 20 |
| EN 10303:2015 |
NO 20-15 |
| ASTM A1086:2013 |
20T680 [15,0] |
| IEC/CEI 60404-8-8:1991 |
NO 20 [15,0] |
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Dimensions
Full table
| |
Notes |
Before side trimming |
Side trimmed |
Slit coils |
| Min width |
Max width |
Min width |
Max width |
Min width |
Max width |
| NO 20 |
3 |
1030 |
1030 |
600 |
1000 |
20 |
600 |
NO 20
| Notes |
3 |
| Before side trimming |
Min width |
1030 |
| Max width |
1030 |
| Side trimmed |
Min width |
600 |
| Max width |
1000 |
| Slit coils |
Min width |
20 |
| Max width |
600 |
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Magnetic properties
Full table
| |
Conventional density (kg/dm³) |
Max loss (W/kg) at 400 Hz at 1 T |
Max loss (W/kg) at 400 Hz at 1.5 T |
Max loss (W/kg) at 700 Hz at 1 T |
Min polarisation (T) at 2500 A/m |
Min polarisation (T) at 5000 A/m |
Min polarisation (T) at 10,000 A/m |
Min number of bends |
Min stacking factor (mm) |
| |
Guaranteed |
Indicative |
Indicative |
Guaranteed |
Guaranteed |
Guaranteed |
Guaranteed |
Guaranteed |
| NO 20 |
7.60 |
15.00 |
38.00 |
32.00 |
1.48 |
1.59 |
1.69 |
2 |
0.93 |
NO 20
| |
|
|
| Conventional density (kg/dm³) |
|
7.60 |
| Max loss (W/kg) at 400 Hz at 1 T |
Guaranteed |
15.00 |
| Max loss (W/kg) at 400 Hz at 1.5 T |
Indicative |
38.00 |
| Max loss (W/kg) at 700 Hz at 1 T |
Indicative |
32.00 |
| Min polarisation (T) at 2500 A/m |
Guaranteed |
1.48 |
| Min polarisation (T) at 5000 A/m |
Guaranteed |
1.59 |
| Min polarisation (T) at 10,000 A/m |
Guaranteed |
1.69 |
| Min number of bends |
Guaranteed |
2 |
| Min stacking factor (mm) |
Guaranteed |
0.93 |
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Mechanical properties
The mechanical properties are for information purposes only.
Full table
| |
Direction |
Re (MPa) |
Rm (MPa) |
A80 (%) |
Re/Rm |
HV |
| NO 20 |
L |
395 - 435 |
505 - 545 |
12 - 22 |
0.78 - 0.83 |
205 - 235 |
NO 20
| |
Direction |
NO 20 |
| Re (MPa) |
L |
395 - 435 |
| Rm (MPa) |
L |
505 - 545 |
| A80 (%) |
L |
12 - 22 |
| Re/Rm |
L |
0.78 - 0.83 |
| HV |
L |
205 - 235 |
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Coating properties
This high frequency grade is available non-insulated or varnished with a C5-type coating.
Find out more about iCARe®, ArcelorMittal’s range of electrical steels for Automotive.
All details provided in the ArcelorMittal Flat Carbon Europe S.A. catalogue are for information purposes only. ArcelorMittal Flat Carbon Europe S.A. reserves the right to change its product range at any time without prior notice.
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