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Electrical steel grades are designated according to guaranteed maximum specific total loss at a peak magnetic polarisation of 1.5 T and 50Hz.

Core loss 1.5T50Hz W/kg

SURA* Grade EN 10106

IEC 60404-8-4

JIS C2552 (2000)

GOST 21427.2 (1983)

Old AISI Grade

ASTM A667 (2007)

Core Loss 1.5T

 

 

 

 

 

 

 

 

60Hz W/lb

50Hz W/lb

2.35

M235-35A

M235-35A5

(35A230)

 

 

 

 

 

2.50

M250-35A

M250-35A5

35A250

2413

(M-15)

(36F145)

145

2.58

2.70

M270-35A

M270-35A5

35A270

2412

(M-19)

(36F155)

1.55

2.76

3.00

M300-35A

M300-35A5

35A300

2411

(M-22)

(36F175)

1.75

3.10

3.30

M330-35A

M330-35A5

 

 

M-36

(36F185)

1.85

3.26

2.50

M250-50A

M250-50A5

50A250

 

 

 

 

 

2.70

M270-50A

M270-50A5

50A270

2414

 

 

 

 

2.90

M290-50A

M270-50A5

50A290

2413

M-15

47F165

1.65

2.86

3.10

M310-50A

M310-50A5

50A290

2412

(M-19)

47F180

1.80

3.12

3.30

M330-50A

M330-50A5

 

 

M-27

47F190

1.90

3.30

3.50

M350-50A

M350-50A5

50A350

(2411)

(M-36)

47F200

2.00

3.47

4.00

M400-50A

M400-50A5

50A400

2216

M-43

(47F240)

2.40

4.17

4.70

M470-50A

M470-50A5

50A470

(2214)

(M-45)

(47F280)

2.80

4.89

5.30

M530-50A

M530-50A5

 

(2211)

M-47

 

 

 

6.00

M600-50A

M600-50A5

50A600

2112

 

 

 

 

7.00

M700-50A

M700-50A5

50A700

2111

 

47F400

4.00

7.04

8.00

M800-50A

M800-50A5

50A800

2011

 

(47F450)

4.50

7.92

3.10

M310-65A

M310-65A5

 

 

 

 

 

 

3.30

M330-65A

M330-65A5

 

 

 

(64F200)

2.00

3.38

3.50

M350-65A

M350-65A5

 

 

M-19

64F210

2.10

3.55

4.00

M400-65A

M400-65A5

 

 

(M-27)

(64F235)

2.35

3.98

4.70

M470-65A

M475-50A5

 

 

(M-43)

64F275

2.75

4.65

5.30

M530-65A

M530-65A5

 

 

(M-45)

(64F320)

3.20

5.46

6.00

M600-65A

M600-65A5

 

 

 

 

 

 

7.00

M700-65A

M700-65A5

 

 

 

 

 

 

8.00

M800-65A

M800-65A5

 

 

 

(64F500

5.00

8.60

6.00

M600-100A

M600-100A5

 

 

 

 

 

 

7.00

M700-100A

M700-100A5

 

 

 

 

 

 

8.00

M800-100A

M800-100A5

 

 

 

 

 

 

10.00

M1000-100A

M1000-100A5

 

 

 

 

 

 

American standards

American standards are based on US units and a test frequency of 60 Hz. There is no exact conversion of loss data from 50 Hz to 60 Hz, but these approximate relationships may be used for losses at 1.5 T:

(W/kg at 50 Hz) =

(WJlb at 60 Hz)

1,77 (for 0.35 mm grades)

1,74 (for 0.50 mm grades)

1,70 (for 0.65 mm grades)

1,64 (for 1.00 mm grades)

American standard thicknesses differ from metric standards, particularly at 0.50 mm:

EN/IEC ASTM

0.35mm 0.36mm (0.0140inch)

0.50mm 0.47mm(0.0185inch)

0.65mm 0.64mm (0.0250inch)

 

Conversion factors

1 Tesla (T) = 1 Weber/m2 (Wb/m2) = 10000 Gauss = 64.5 kilolines/sq.in.

1 A/m = 0.01 A/cm = 0.0254 A/in = 0.01257 Oersted

1 W/kg = 0.4536 W/lb (at the same frequency)

1 VA/kg = 0.4536 VA/Ib (at the same frequency)

1 N/mm2 (MPa) = 145.0 psi (lbs/sq.in.)