Important Electrical Properties of CRGO Cold Rolled Grain Oriented Steel & Hi - B CRGO Grades
Core Loss Details of Popularly used CRGO Electrical steel.
Manufacturing mills of CRGO Grain Oriented Electrical Steel guarantee the Core Loss figure at flux density of 1.5 Tesla in Case of CRGO Conventional Grain Oriented Electrical Steel Grades and in Case CRGO HIB Grades and CRGO HIB LS Electrical Steel at 1.7 Tesla,50 HZ.
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 | 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 | 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 | 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 Cold Rolled Grain Oriented Electrical Steel is available in various grades (Generally called M3, M4, M5 & M6). Followed 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 and Thickness.
Important physical properties of CRGO Steel | |
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 Electrical Steel
CRGO MOTHER 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. ) | |
CRGO 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 Grain Oriented Electrical Steel Tolerances in Dimensions & Shape of CRGO Steel
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 crgo steel strips (width 75mm over). |
Besides the Watt Losses of CRGO 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 customer request.
Conventional CRGO Grades Generally M3, M4, M5, M6 are used regularly for Transformer Cores in Transformers. However recently due to environmental protection, energy savings are becoming a very important factor and minimizing core loss in Transformers is becoming a must.Nippon Steel Corporation JAPAN has come out with low loss Hi-B Grades materials,which guarantee low Watt Losses at 1.5 Tesla flux density. Such materials are called CRGO Hi-B materials. Table 3 gives magnetic properties of CRGO Hi-B material. Popular Hi-B grades used in India are 23 MOH and 27 MOH.
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 |