Various grades of CRGO today

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.

More grades of CRGO


Norminal
Thickness
(mm)

China
GB
2521-96

Russia
GOST
21427.1-83

Japan
JS G2553-86

USA
ASTM
A876M-92

British

Germany
DIN
EN10107-96

France
NF EN
10107-96

BS
640418.7

BSEN
10107-96

0.27

27QG100

3414

27P100

-

-

M103-27P

M103-27P

M103-27P

27QG110

3408

27P110

27P146M

-

M103-27P

M103-27P

M103-27P

27QG120

3407

27G120

27H163M

-

-

-

-

27QG130

3406

27G130

27H163M

130-275

M130-275

M130-27S

M130-27S

27QG140

3405

27G140

-

089-27N5

M089-27N

M089-27N

M089-27N

0.3

30QG110

3408

30P110

30P154M

-

M111-30P

M111-30P

M111-30P

30QG120

3408

30P120

30P154M

-

M117-30P

M117-30P

M117-30P

30QG130

3405

-

30H183M

-

-

-

-

30Q130

3406

30G130

30H183M

-

-

-

NFC-28-920

 

 

 

 

 

 

 

FEM140-30-3

30Q140

3405

30G140

30H183M

140-30S5

M140-30S

M140-30S

M140-30S

30Q150

3404

30G150

-

097-30-N5

M098-30N

M097-30N

M097-30N

0.35

35QG125

3408

35P125

-

-

-

-

-

35QG135

3407

35P135

-

-

-

-

-

35Q135

3407

-

-

-

-

-

-

35Q145

3406

35G145

-

-

M15035S

M150-35S

M150-35S

35Q155

3405

35G155

35H207M

 

M15035S

M150-35S

M150-35S

35Q165

3404

35G165

-

111-35-N5

M111-35N

M111-35N

M111-35N


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.