ABOUT CRGO

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Important Electrical Properties of CRGO & Hi – B CRGO Grades

Core Loss details of popularly used CRGO steel
Manufacturing mills of CRGO Steel guarantee the core loss figure at flux density of 1.5 Tesla in case of CRGO conventional grain oriented steel and at 1.7 Tesla in case of CRGO HI-B-Steel and CRGO HI-B-LS Steel.

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 or Cold Rolled Grain Oriented Steel is available in various grades (generally called M3, M4, M5 & M6). Follow 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.


Click here for more grades of CRGO

 

Important physical properties of CRGO
 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


CRGO 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.)
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 Tolerances in Dimensions & Shape of CRGO
  
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 steel strips (width 75mm over).


Besides the Watt Losses 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 request.

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

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)
B (T)
%
0.23 9 23ZDKH85 0.85 0.57 0.78 1.91 97.5
23ZDKH90 0.90 0.58 0.80 1.91
23ZDMH85 0.85 0.57 0.78 1.91 97.4
23ZDMH90 0.90 0.59 0.81 1.91
23ZH90 0.90 0.63 0.87 1.92 97.7
23ZH95 0.95 0.64 0.90 1.92
23M-OH 1.00 0.66 0.93 1.92
0.27 11 27ZDKH90 0.90 0.62 0.84 1.92 98.0
27ZDKH95 0.95 0.65 0.88 1.91
27ZDMH90 0.90 0.62 0.84 1.91 97.9
27ZDMH95 0.95 0.65 0.88 1.91
27ZH95 0.95 0.69 0.93 1.91 98.1
27M-OH 1.03 0.72 0.99 1.91
27M-1H 1.09 0.74 1.03 1.91
0.30 12 30ZH100 1.00 0.73 0.98 1.92 98.3
30M-OH 1.05 0.74 1.01 1.91
0.35 11 35M-1H 1.16 0.85 1.13 1.92 98.5

CRGO BIS Standard Grade, Mill Equivalent Grades Of Various CRGO Producing Mills


New Grades of CRGO as per BIS

AK Steel

COGENT

JFE

NIPPON

POSCO

TKES
23HP 85d TCH 0DR M085-23P 23JGSD85 23ZDKH85 23PHD85 H 085-23
23HP 90d TCH 0 C M090-23P 23JGSD90 23ZDKH95 23PHD90 H 090-23
23CG 110 23M3 110 M110-23S 23JG 110 C 110-23
23CG 120 M120-23S 23M3 C 120-23
27HP 90d TCH 1DR M090-27P 27JGSD90 27ZDKH90 27PHD 90 H 090-27
27HP 95d M095-27P 27JGSD95 27ZDKH95 27PHD 95 H 095-27
27HP 100 TCH1C M100-27P 27JGH 100
27MOH 27PH 100 H 103-27
27HP 110 27JGH 110
27ZH 110 27PG 110
27CG 120 27M4 120 M120-27S 27JG 120 27M4 27PG 120 C 120-27
27CG 130 27M4 130 M130-27S 27JG 130 C 130-27
30HP 105 TCH 2 Carlite M105-30P 30JGH 105
30MOH 30PH 105 H 105-30
30CG 120 30M5 120 M120-30S 30JG 120 30PG 120
30CG 130 30M5 130 M130-30S 30JG 130 30M5 30PG 130 C 130-30
30CG 140 M140-30S 30JG 140 30PG 140 C 140-30
35CG 145 M150-35S 35 JG 145
35M6 30PG 145 C 150-35
35CG 155 35JG 155 30PG 155 C 165-35


CRGO IS 3024 : 2015
Table 1 Magnetic Properties of Conventional Grain Oriented CRGO Electrical Steel
(Clauses 4.2, 5.2, 8.1 and 8.2)

CRGO Grade Nominal
Thickness
mm
Maximum Specific Core
Loss at 1.5 T
W/kg
Maximum Specific Total
Loss at 1.7 T
W/kg
50 Hz
Minimum Polarization in
Tesla at a Field Strength
of 800
A/m
Minimum
Stacking
Factor
50 Hz 60 Hz
(1) (2)  (3) (4) (5) (6) (7)
23CG110 0.23 0.73 0.96 1.10 1.78 0.945
23CG120 0.23 0.77 1.01 1.20 1.78 0.945
23CG127 0.23 0.80 1.03 1.27 1.75 0.945
27CG120 0.27 0.80 1.07 1.20 1.78 0.950
27CG130 0.27 0.85 1.12 1.30 1.78 0.950
27CG140 0.27 0.89 1.15 1.40 1.75 0.950
30CG120 0.30 0.83 1.09 1.20 1.78 0.955
30CG130 0.30 0.85 1.15 1.30 1.78 0.955
30CG140 0.30 0.92 1.21 1.40 1.78 0.955
30CG150 0.30 0.97 1.25 1.50 1.75 0.955
35CG145 0.35 1.03 1.36 1.45 1.78 0.960
35CG155 0.35 1.07 1.41 1.55 1.78 0.960
35CG165 0.35 1.11 1.52 1.65 1.75 0.960


NOTE – Normally the CRGO tests should be performed at 50Hz. However, countries where power supply at 50 Hz is not available, testing may be carried out at 60 Hz and accordingly product shall conform to the specified values given in the above Table. However , in all such cases, the product shall also conform to the specified values of above Table of CRGO when tested in importing country having power supply at 50 Hz.

8.3 In the case of Epstein CRGO strips lamination, samples are sheared develop magnetic property at 780ºC to 840ºC. In the longitudinal to the rolling direction and then CRGO lamination stress case of single sheet test specimens, they shall not be relief annealed in a neutral or reducing atmosphere to heat treated.

Table 2 Magnetic Properties of High Permeability
Grain Oriented CRGO Electrical Steel
(Clauses 4.2, 5.2, 8.1 and 8.2)

HIB CRGO
Grade
Nominal
Thickness
mm
Maximum Specific Total Loss at
1.7 T
W/kg
Minimum Polarization in Tesla at a Field
Strength
of 800
A/m
Minimum
Stacking Factor
50Hz 60Hz
(1) (2) (3) (4) (5) (6)
23HP75d 0.23 0.75 0.99 1.85 0.945
23HP80d 0.23 0.80 1.04 1.85 0.945
23HP85d 0.23 0.85 1.12 1.85 0.945
23HP90d 0.23 0.90 1.19 1.85 0.945
23HP95 0.23 0.95 1.25 1.85 0.945
23HP100 0.23 1.00 1.32 1.85 0.945
27HP85d 0.27 0.85 1.12 1.85 0.950
27HP90d 0.27 0.90 1.19 1.85 0.950
27HP95d 0.27 0.95 1.25 1.85 0.950
27HP100 0.27 1.00 1.32 1.88 0.950
27HP110 0.27 1.10 1.45 1.88 0.950
30HP95 0.30 0.95 1.25 1.88 0.955
30HP100 0.30 1.00 1.32 1.88 0.955
30HP105 0.30 1.05 1.38 1.88 0.955
30HP110 0.30 1.10 1.46 1.88 0.955
30HP120 0.30 1.20 1.58 1.88 0.955
35HP110 0.35 1.10 1.45 1.88 0.960
35HP115 0.35 1.15 1.51 1.88 0.960
35HP125 0.35 1.25 1.64 1.88 0.960
35HP135 0.35 1.35 1.77 1.88 0.960


NOTES

  1. Normally grain oriented steel CRGO tests should be performed at 50 Hz. However, countries where power supply at 50 Hz is not available, testing may be carried out at 60 Hz and accordingly product shall conform to the specified values given in the above Table. However, in all such cases,the CRGO product shall also conform to the specified values of above Table of CRGO when tested in importing country having power supply at 50 Hz.
  2. High permeability CRGO grades may be delivered in domain refined condition (reference suffixd). The magnetic properties of some domain refined material may deteriorate when the material is subjected to heat treatment.
  3. In case where material gets deteriorated when subjected to heat treatment, the domain refined CRGO grades need to be checked by Single Sheet method as given in 14.5 and as per IS649. For other CRGO lamination or cores grades /other types of domain refined CRGO grades which do not deteriorate when subjected to heat treatment, the test method shall be as Epstein as given in 14.1 and as per IS 649 CRGO.