Technical Specification

Properties of CRGO steel


The magnetization property is affected by impurities, grain orientation, grain size and surface smoothness. It includes magnetostriction, saturation induction, magneto crystalline anisotropy and Curie temperature. Higher resistivity reduces the core loss and magnetostriction reduces by adding Silicon.
  • Density: 7.65 g/cm3
  • Silicon Content: 3 to 4%
  • Ultimate tensile Strength (0 deg to rolling direction): 32.6 kg/mm2
  • Ultimate tensile Strength (90 degree to rolling direction): 38.2 kg/mm2
  • Resistivity: 48 µΩ-cm
  • Stacking factor: 97%
  • Melting Point: 1500 C

Losses in various grades of raw materials

CRGO silicon steel is available in thickness of 0.23mm, 0.27mm, 0.30mm and 0.35mm. Losses are given according to their thickness. The same has been classified by mills in various grades.

JAPAN

KOREA

GERMANY

USA

Thickness Grade Losses
1.5 T
1.7 T
0.23mm
M3
0.79
1.10
MOH
-
1.00
27 ZH 90
-
0.90
23 ZDKH 85
-
0.85
Thickness Grade Losses
1.5 T
1.7 T
0.23
23 PG 110
-
1.10
23 PH 95
-
0.95
23 PH 085
-
0.85
Thickness Grade Losses
1.5 T
1.7 T
0.23
C 110
0.73
1.10
H 100
-
1.00
H 090
-
0.90
Thickness Grade Losses
1.5 T
1.7 T
0.23
M3
0.73
1.17
H 100
-
1.01
TCHODR
0.65
0.90
Thickness Grade Losses
1.5 T
1.7 T
0.27
M4
0.89
1.27
MOH
-
1.03
27 ZH 95
0.69
0.93
27 ZDKH 90
-
0.90
Thickness Grade Losses
1.5 T
1.7 T
0.27
27 PG 130
-
1.30
27 PH 120
-
1.20
27 PH 100
-
1.00
27 PHD 090
-
0.90
Thickness Grade Losses
1.5 T
1.7 T
0.27
C 140
0.89
1.40
C 120
0.80
1.20
C 103
-
1.03
H 095
-
0.95
Thickness Grade Losses
1.5 T
1.7 T
0.27
M4
0.85
1.24
TCH1
-
1.11
TCHODR
0.71
0.96
Thickness Grade Losses
1.5 T
1.7 T
0.30
M5
0.97
1.28
MOH
-
1.05
30 ZH 100
0.72
0.98
Thickness Grade Losses
1.5 T
1.7 T
0.30
30 PG 140
-
1.40
30 PG 130
-
1.30
30 PG 120
-
1.20
30 PH 105
-
1.05
Thickness Grade Losses
1.5 T
1.7 T
0.30
C 105
0.97
1.50
C 130
0.85
1.30
H 111
-
1.11
H 105
-
1.05
Thickness Grade Losses
1.5 T
1.7 T
0.35
M6
1.11
1.46
35 ZH 115
0.84
1.12
Thickness Grade Losses
1.5 T
1.7 T
0.35
35 PG 155
-
1.55
35 PG 145
-
1.45
Thickness Grade Losses
1.5 T
1.7 T
0.35
C 165
1.11
1.65
C 150
1.05
1.50
C 140
1.00
1.40

Tolerances in Dimensions and Shape of CRGO

SIZE AND FORM TOLERANCES
Width (mm) Thickness (mm) Thickness Tolerance(mm) Deviation of thickness in crosswire direction (mm) Width (mm) Camber per 2 metres of length(mm)
150 or lesser
0.23
0.02




0.27

0.02
0.2


0.30
0.03




0.35










Between 150 and 400 (incl.)
0.23
0.02




0.27

0.02
0.3


0.30
0.03




0.35



1.0






Between 400 and 750 (incl.)
0.23
0.02




0.27

0.03
0.5


0.30
0.03




0.35










More than 750
0.23
0.02




0.27

0.03
0.6


0.30
0.03




0.35




Building factor

After several years of experience and determination for providing high quality products to our valued customers, we have been able to bring down the building factor in our production process.
Building factor (BF) is a very important factor used in determining the No Load Losses of a transformer. It is an empirically derived value based on previous experiences. It ranges from 1.08 to 1.35 for three phase, three limb cores. Generally, BF is dependent on various important factors like core geometry, quality of workmanship of core and grade of material being used.
Reducing the BF is a measure that we have incorporated over time by taking precautionary step like proper handling, maintaining appropriate parameters within the processes and controlling burr and edge camber levels. We have facility for Step Lap construction of transformer core which has lower BF as compared to conventional Non Step Lap cores due to lower No Load current and noise levels.

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