Important Electrical Properties of CRGO Cold Rolled Grain Oriented Steel & Hi - B CRGO Grades

Core Loss Details of Popularly used CRGO Electrical steel.
Manufacturing mills of CRGO Grain Oriented Electrical Steel guarantee the Core Loss figure at flux density of 1.5 Tesla in Case of CRGO Conventional Grain Oriented Electrical Steel Grades and in Case CRGO HIB Grades and CRGO HIB LS Electrical Steel at 1.7 Tesla,50 HZ.

Thickness


MM
CRGO Grade Assumed Maximum Core Loss Minimum
Induction
at 800 A /
m T
  KG/DM3 At 1.5T At 1.7T

0.23

23ZDKH90

7.65

 

0.9

1.88

0.23
-0.009

23ZH90

 

 

0.9

1.88

23ZH95

 

 

0.95

1.88

M-0H

 

 

1

1.88

M-1

7.65

0.71

1.06

1.8

M-2

 

0.75

1.12

1.8

M-3

 

0.79

1.04

1.8

0.27
-0.0106

27ZDKH95

7.65

 

0.95

1.88

27ZH95

 

 

0.95

1.88

27ZH100

 

 

1

1.8

M-0H

 

 

1.03

1.88

M-1H

7.65

 

1.09

1.88

M-3

 

0.83

1.21

1.8

 

M-4

 

0.89

1.27

1.8

0.3
-0.0118

30ZH100

 

 

1

1.88

M-0H

 

 

1.05

1.88

M-1H

 

 

1.11

1.88

M-2H

7.65

 

1.17

1.88

M-3

 

0.85

1.23

1.8

M-4

 

0.9

1.32

1.8

M-5

 

0.97

1.39

1.8

 

M-1H

 

 

1.16

1.88

 

M-2H

 

 

1.16

1.88

 

M-3H

 

 

1.28

1.88

 

M-5

 

1.01

1.45

1.8

 

M-6

 

1.11

1.57

1.8

 

Technical Details of CRGO

CRGO Cold Rolled Grain Oriented Electrical Steel is available in various grades (Generally called M3, M4, M5 & M6). Followed link below "more grades of CRGO" for Major international standards such as Japanese (JIS), American (ASTM), German (DIN) and British Standards which specify CRGO grade and Thickness.

 Important physical properties of CRGO Steel
 Density gm/c3  7.65
 Silicon content %  3.10
 Resistivity micro Ohm-centimeter  48.00
 Ultimate Tensile Strength 0° to Rolling Direction Kg/mm2  32.60
 Ultimate Tensile Strength 90° to Rolling Direction Kg/mm2  38.20
 Stacking factor % M4 (.27 mm)  96.00
 Stacking factor % M5 (.30 mm)  96.50
 Stacking factor % M6 (.35 mm)  97.00
CRGO materials come either in the form of coils or sheets. Given below the details of dimensions and tolerances as per JIS C 3553.

 

Dimensions and Tolerances of CRGO Electrical Steel

CRGO MOTHER COILS Thickness 0.18 mm (0.0071 in. )
0.20 mm (0.0079 in.), 0.23 mm (0.0091 in. )
0.27 mm (0.0106 in.), 0.30 mm (0.0118 in. )
0.35 mm (0.0138 in.)
Width
(Standard width available with range) 
914 mm (36 in.), and 1000 mm (39 in. )
from 50 mm(2 in.), to 1.050mm (41 in. )
Inside Coil Diameter 
508 mm (20 in. )
CRGO Sheets Thickness 0.30 mm (0.0118 in.), 0.35 mm (0.0138 in. )
Width 914 mm (36 in.), and 1000 mm (39 in. )
Length Length will be available according to negotiation

 

CRGO Grain Oriented Electrical Steel Tolerances in Dimensions & Shape of CRGO Steel
Conform to JIS C 2553.

Width
mm 
Thickness mm TOLERANCE
Thickness mm Deviation of thickness in transverse direction
mm
Width
mm
Camber in any 2 metres
(Slit Products)
mm 
Shear Burr mm 
150
or under
0.18
0.20
0.23
0.27
0.30
0.35
+0.02
+0.02
+0.02
+0.03
+0.03
+0.03
0.02 or under 
+0.20 1.0 or under   0.04
or under
over 150
to 400
0.18
0.20
0.23
0.27
0.30
0.35
  +0.02 +0.02
+0.02
+0.03
+0.03
+0.03
0.02
or under 
+0.30
over 400
to 750 
0.18
0.20
0.23
0.27
0.30
0.35
+0.02
+0.02
+0.02
+0.03
+0.03
+0.03
0.03
or under 
+0.50
over 750 0.18
0.20
0.23
0.27
0.30
0.35
+0.02
+0.02
+0.02
+0.03
+0.03
+0.03
0.03
or under 
+0.6
0
 Note : Stipulation of camber shall be applied only for the crgo steel strips (width 75mm over).

 

Besides the Watt Losses of CRGO at specific flux densities of 1.5 T and 1.7 T CRGO manufacturers also give curves of indicating Watt Losses ad A.C. Magnetization at various flux densities. These curves are of immense help to Transformer designers, and available on customer request.

Conventional CRGO Grades Generally M3, M4, M5, M6 are used regularly for Transformer Cores in Transformers. However recently due to environmental protection, energy savings are becoming a very important factor and minimizing core loss in Transformers is becoming a must.Nippon Steel Corporation JAPAN has come out with low loss Hi-B Grades materials,which guarantee low Watt Losses at 1.5 Tesla flux density. Such materials are called CRGO Hi-B materials. Table 3 gives magnetic properties of CRGO Hi-B material. Popular Hi-B grades used in India are 23 MOH and 27 MOH.

Hi - B CRGO MATERIALS :

Thickness Grade Core Loss Lamination Factor
Max. Typical Typical Typical
mm mil W
(W/Kg)
W
(W/Kg)
W
(W/Kg)
W
(W/Kg)
W (W/Kg) B (T) %
0.23 9 23ZDKH85 0.85 0.57 0.78 0.34 0.46 1.91 97.5
23ZDKH90 0.90 0.58 0.80 0.35 0.48 1.91
23ZDMH85 0.85 0.57 0.78 0.34 0.46 1.91 97.4
23ZDMH90 0.90 0.59 0.81 0.35 0.48 1.91
23ZH90 0.90 0.63 0.87 0.37 0.51 1.92 97.7
23ZH95 0.95 0.64 0.90 0.38 0.53 1.92
23M-OH 1.00 0.66 0.93 0.39 0.54 1.92
0.27 11 27ZDKH90 0.90 0.62 0.84 0.38 0.53 1.92 98.0
27ZDKH95 0.95 0.65 0.88 0.39 0.52 1.91
27ZDMH90 0.90 0.62 0.84 0.38 0.53 1.91 97.9
27ZDMH95 0.95 0.65 0.88 0.39 0.53 1.91
27ZH95 0.95 0.69 0.93 0.41 0.55 1.91 98.1
27M-OH 1.03 0.72 0.99 0.43 0.59 1.91
27M-1H 1.09 0.74 1.03 0.44 0.61 1.91
0.30 12 30ZH100 1.00 0.73 0.98 0.44 0.58 1.92 98.3
30M-OH 1.05 0.74 1.01 0.44 0.60 1.91
0.35 11 35M-1H 1.16 0.85 1.13 0.52 0.68 1.92 98.5

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