KRYFS offers a wide range of CRGO Slit Coil

CRGO Slit Coils

KRYFS offers a wide range of CRGO Slit Coil. Manufactured using optimum-grade raw material, these products are available in sizes ranging from 10 mm to 1000 mm and thickness ranging from 0.18 to 0.35mm various grades. Automated George CNC machines are used for slitting  to attain a minimum formation of burr in the cutting edge of coils. We manufacture these products in line with the global quality standards and norms.

Important Electrical Properties of CRGO

Table 1 - Grain Oriented Electrical Steel strips

Japanese
JIS C 2553 (1986)
Classification Density
(kg/dm)
Iron Loss
(W/kg)
W17/50
Magnetic
Flux Density (T) B
Symbol Thickness
mm
27 P 100 0.27 7.65 1.00 max. 1.85
27 P 100 1.00 max.
27 G 120 1.20 max. 1.78
27 G 130 1.30 max.
27 G 140 1.40 max. 1.75
30 P 110 0.30 1.10 max. 1.85
30 P 120 1.20 max.
30 G 130 1.30 max. 1.78
30 G 140 1.40 max.
30 G 150 1.50 max. 1.75
35 P 125 0.35 1.25 max. 1.85
35 P 135 1.35 max.
35 G 145 1.45 max. 1.78
35 G 155 1.55 max.
35 G 165 1.655 max. 1.75

 

British
BS 601 Part 2 (1973)
Maximum specific total loss at a peak magnetic flux density of 1.5T and a frequency of 50 Hz.
Grade
Maximum specific total loss W/kg
35M6 1.11
30M6 1.07
30M5
0.97
28M5
0.95
28M4
0.89

 

USA
AISI ( 1983 )
MAXIMUM CORE LOSSES - Electrical Steels Grain Oriented Full Processed ASTM A665
ASTM
Type

Former
AISI
Type
Thickness
Maximum Core Loss at 15 kg (1.5 T)
W /lb W /kg
Inch
mm 60Hz
50Hz
60Hz
50Hz
27G053
M-4 0.0106
0.27 0.53 0.40 1.17 0.89
30G058
M-5 0.0118 0.30 0.58 0.44 1.28 0.97
35G066
M-6 0.0138 0.35 0.66
0.50 1.46 1.11

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 (.27mm) 96.00
Stacking factor % M5 (.30mm) 96.50
Stacking factor % M6 (.35mm) 97.00
CRGO materials come either in the form of coils or sheets. Table 2 gives details of dimensions and tolerances as per JIS C 3553.

Dimensions & Tolerances

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

Tolerances in Dimensions & Shape - 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  0.05
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

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
35M-2H 1.22 0.90 1.19 0.54 0.73 1.92

A. K. Steel Corp. of USA ( formally ARMCO) has also come out with their own brand of low loss CRGO called Trancor H-0 and Trancor H-1. The Watt Losses are as follows :

Core Losses

ARMCO TRAN. CORE
(TC)
THICKNESS INCHES (mm) WATTS PER KG 60 Hz
1.7 T
WATTS PER KG 50 Hz
1.7 T
TYPICAL WATTS PER KG
@ 1.7 T/50 Hz T
TC H0 .009 ( .23 ) 1.32 0.90 0.80
TC H1 .011 ( .27 ) 1.46 1.00 0.90
TC H2 .012 ( .30 )   1.05 0.95

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