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The iCARe® 420 Save products are low loss electrical steel grades with a guaranteed yield strength of 420 MPa. Compared to the standard iCARe® Save grades, these iCARe® 420 Save grades have a higher yield strength. The iCARe® 420 Save product family combines improved mechanical properties with low core losses, which are specified as guaranteed losses at 400 Hz and indicative maximum values at 700 Hz, both at 1 T. These values are representative of the steel’s core loss behaviour at high frequencies.
The improved and guaranteed yield strength (420 MPa) of the iCARe® 420 Save products allows for rotor design improvements of for instance interior permanent magnet synchronous machines. Combined with the low core losses which are particularly useful in the stator, such mechanical rotor design improvements increase the overall performance of the electrical machine.
iCARe® 420 Save grades have an improved combination of mechanical properties, core losses and magnetic polarisation, and are most effective at reducing iron losses from machine parts which are subject tohigh base frequencies, additional space and time harmonics. The valorisation of the improved mechanical properties of the iCARe® 420 Save grades can be found in those electrical machine topologies where its higher yield strength can be exploited by optimising the mechanical design and/or increasing the machine’s rotating speed, thus enhancing the power density.
In general, Save grades help to improve machine efficiency, especially in the high speed region of the operational torque-versus-speed map. Save grades are particularly useful for reducing iron losses in high-speed hybrid and electric traction machines:the driving range is extended as Save grades save battery energy. Also, having lower core losses implies leaner cooling strategies and thermal management of the electrical machines.
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ArcelorMittal name | Conventional density (kg/dm3) | Max. loss (W/kg) at 400 Hz at 1T [Guaranteed] | Max. loss (W/kg) at 700 Hz at 1T [Indicative] | Min. polarisation (T) at 2,500 A/m [Guaranteed] | Min. polarisation (T) at 5,000 A/m [Guaranteed] | Min. polarisation (T) at 10,000 A/m [Indicative] | Max. anisotropy of loss (±%) at 400 Hz at 1T [Guaranteed] | Min. number of bends [Guaranteed] | Min. stacking factor [Guaranteed] |
420 Save 20-13 | 7.6 | 13 | 29 | 1.49 | 1.60 | 1.70 | 15 | 5 | 0.93 |
420 Save 25-14* | 7.60 | 14 | 34 | 1.49 | 1.60 | 1.70 | 15 | 5 | 0.94 |
420 Save 27-15 | 7.60 | 15 | 37 | 1.49 | 1.60 | 1.70 | 15 | 5 | 0.94 |
420 Save 30-16 | 7.60 | 16 | 41 | 1.49 | 1.60 | 1.70 | 15 | 5 | 0.95 |
* On request
Remark: better guaranteed magnetic properties are available on request.
The typical data in the following table is provided for information purposes only.
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ArcelorMittal name | Direction | Re (MPa) [Guaranteed] | Re (MPa) | Rm (MPa) | Re/Rm | A80 (%) | HV |
420 Save 20-13 | L | > 420 | 430 - 470 | 550 - 600 | 0.77 - 0.81 | 10 - 20 | 200 - 230 |
T | > 420 | 445 - 485 | 565 - 615 | 0.77 - 0.81 | 10 - 20 | 200 - 230 | |
420 Save 25-14* | L | > 420 | 430 - 470 | 550 - 600 | 0.77 - 0.81 | 10 - 20 | 200 - 230 |
T | > 420 | 445 - 485 | 565 - 615 | 0.77 - 0.81 | 10 - 20 | 200 - 230 | |
420 Save 27-15 | L | > 420 | 430 - 470 | 550 - 600 | 0.77 - 0.81 | 12 - 25 | 200 - 230 |
T | > 420 | 445 - 485 | 565 - 615 | 0.77 - 0.81 | 12 - 25 | 200 - 230 | |
420 Save 30-16 | L | > 420 | 430 - 470 | 550 - 600 | 0.77 - 0.81 | 12 - 25 | 200 - 230 |
T | > 420 | 445 - 485 | 565 - 615 | 0.77 - 0.81 | 12 - 25 | 200 - 230 |
* On request
Save grades can be used immediately after lamination punching. The punching effect can be eliminated by performing a stress-relief annealing. This optimises their performance inapplications with fine teeth, and enables a substantial part of the lower frequency area to beexploited. A C5-type coating is recommended.
Save stacks can be produced using existing assembly techniques such as interlocking or welding.