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CRGO STEEL.COM : Manufacturers of CRGO Transformer Laminations upto 200 MVA, CRGO Slit Coils, CRGO Staked Cores  and CRGO Wound Core in Kolkata, India.

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CRGO STEEL - Leading Manufacturer of CRGO Transformer Cores
 
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CRGO STEEL: Manufacturers of CRGO Transformer Core Laminations & CRGO Strips in India.
 
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Important Electrical Properties of CRGO ...
 
CRGO Strips (Cold Rolled Grain Oriented) Manufacturers in India.
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Important Electrical Properties of CRNGO ...
   
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Application of  CRGO & CRNGO electrical steel
CRGO STEEL - Application of CRGO & CRNGO elctrical steel
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About CRGO
 
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.
 
  
 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)
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
 
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 780C to 840C. 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.

 
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