CRGO
Home > CRGO
Manufacturers of CRGO Transformer Laminations upto 200 MVA, CRGO Slit Coils, CRGO Staked Cores and CRGO Wound Core in Kolkata, India.
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 KG/DM³ |
Maximum Core Loss | Minimum Induction at 800 A / m T |
|
|---|---|---|---|---|---|
| At 1.5T | At 1.7T | ||||
| 0.23 -0.009 |
23ZDKH90 | 7.65 | 0.9 | 1.88 | 1.88 |
| 23ZH90 | 0.9 | 1.88 | 1.88 | ||
| 23ZH95 | 0.95 | 1.88 | 1.88 | ||
| M-0H | 1 | 1.88 | 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 | 1.88 |
| 27ZH95 | 0.95 | 1.88 | 1.88 | ||
| 27ZH100 | 1 | 1.88 | 1.88 | ||
| M-0H | 1.03 | 1.9 | 1.88 | ||
| M-1H | 7.65 | 1.04 | 1.91 | 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 | 1.88 | |
| M-1H | 1.05 | 1.9 | 1.88 | ||
| M-2H | 7.65 | 1.17 | 1.91 | 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 | 1.9 | 1.88 | ||
| M-3H | 1.24 | 1.95 | 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 1,050 mm (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 | +0.02 | 0.02 or under | +0.20 | 0.04 or under | |
| 0.20 | +0.02 | |||||
| 0.23 | +0.02 | |||||
| 0.27 | +0.03 | |||||
| 0.30 | +0.03 | |||||
| 0.35 | +0.03 | |||||
| over 150 to 400 | 0.18 | +0.02 | 0.02 or under | +0.30 | 0.04 or under | |
| 0.20 | +0.02 | |||||
| 0.23 | +0.02 | |||||
| 0.27 | +0.03 | |||||
| 0.30 | +0.03 | |||||
| 0.35 | +0.03 | |||||
| over 400 to 750 | 0.18 | +0.02 | 0.03 or under | +0.50 | 0.04 or under | |
| 0.20 | +0.02 | |||||
| 0.23 | +0.02 | |||||
| 0.27 | +0.03 | |||||
| 0.30 | +0.03 | |||||
| 0.35 | +0.03 | |||||
| over 750 | 0.18 | +0.02 | 0.03 or under | +0.60 | 0.04 or under | |
| 0.20 | +0.02 | |||||
| 0.23 | +0.02 | |||||
| 0.27 | +0.03 | |||||
| 0.30 | +0.03 | |||||
| 0.35 | +0.03 | |||||
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 Max. |
Core Loss Typical |
Lamination Factor | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| W (W/Kg) |
B (T) | W (W/Kg) |
B (T) | W (W/Kg) |
B (T) | Typical | % | |||
| 0.23 | 9 | 23ZDKH85 | 0.85 | 1.91 | 0.57 | 1.91 | 0.34 | 1.91 | 97.5 | |
| 23ZDKH90 | 0.90 | 1.91 | 0.58 | 1.91 | 0.35 | 1.91 | 97.4 | |||
| 23ZDMH85 | 0.85 | 1.91 | 0.54 | 1.91 | 0.32 | 1.91 | 97.3 | |||
| 23ZDMH90 | 0.90 | 1.91 | 0.59 | 1.91 | 0.38 | 1.91 | 97.3 | |||
| 23ZH90 | 0.95 | 1.92 | 0.60 | 1.92 | 0.39 | 1.92 | 97.7 | |||
| 23ZH95 | 0.95 | 1.92 | 0.64 | 1.92 | 0.39 | 1.92 | 97.8 | |||
| 0.27 | 11 | 23M-OH | 1.00 | 1.93 | 0.65 | 1.93 | 0.42 | 1.93 | 97.9 | |
| 27ZDKH90 | 0.90 | 1.93 | 0.62 | 1.93 | 0.39 | 1.93 | 98.0 | |||
| 27ZDKH95 | 0.95 | 1.93 | 0.68 | 1.93 | 0.52 | 1.93 | 97.9 | |||
| 27ZDMH90 | 0.90 | 1.93 | 0.60 | 1.93 | 0.39 | 1.93 | 98.0 | |||
| 27ZH95 | 1.00 | 1.93 | 0.73 | 1.93 | 0.53 | 1.93 | 98.1 | |||
| 0.30 | 12 | 27M-OH | 1.00 | 1.93 | 0.73 | 1.93 | 0.48 | 1.93 | 98.1 | |
| 30ZH100 | 1.03 | 1.92 | 0.75 | 1.92 | 0.52 | 1.92 | 98.3 | |||
| 30M-OH | 1.05 | 1.92 | 0.77 | 1.92 | 0.54 | 1.92 | 98.3 | |||
| 0.35 | 11 | 35M-1H | 1.16 | 1.92 | 0.85 | 1.93 | 0.52 | 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 | 23JGSDB85 | 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 | 27PHD90 | H 090-27 |
| 27HP 95d | — | M095-27P | 27JGSD95 | 27ZDKH95 | 27PHD95 | H 095-27 |
| 27HP 100 | TCH1C | M100-27P | 27JGH 100 | 27MOH | 27PG 100 | H 100-27 |
| 27HP 110 | — | M110-27S | 27JZH 110 | 27ZH 110 | 27PG 110 | H 110-27 |
| 27CG 120 | 27M4 120 | M120-27S | 27JG 120 | — | 27PG 120 | C 120-27 |
| 27CG 130 | 27M4 130 | M130-27S | 27JG 130 | — | 27PG 130 | C 130-27 |
| 27CG 105 | TCH 2 Carlite | M105-30S | 30JGH 105 | 30MOH | 30PH 105 | H 105-30 |
| 30CG 120 | 30M5 120 | M120-30S | 30JG 120 | — | 30PG 120 | C 120-30 |
| 30CG 130 | — | M130-30S | 30JG 130 | — | 30PG 130 | C 130-30 |
| 35CG 140 | — | M140-35S | 35JG 140 | — | 30PG 140 | C 140-35 |
| 35CG 145 | — | M150-35S | 35 JG 145 | — | 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 50 Hz |
Maximum Specific Core Loss at 1.5 T W/kg 60 Hz |
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 |
|---|---|---|---|---|---|---|
| 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 | 1.04 | 1.27 | 1.78 | 0.945 |
| 27CG120 | 0.27 | 0.80 | 1.07 | 1.20 | 1.78 | 0.950 |
| 27CG130 | 0.27 | 0.84 | 1.12 | 1.30 | 1.78 | 0.950 |
| 27CG140 | 0.27 | 0.89 | 1.15 | 1.40 | 1.75 | 0.950 |
| 30CG120 | 0.30 | 0.85 | 1.13 | 1.20 | 1.78 | 0.955 |
| 30CG130 | 0.30 | 0.88 | 1.15 | 1.30 | 1.75 | 0.955 |
| 30CG150 | 0.30 | 0.95 | 1.22 | 1.50 | 1.75 | 0.955 |
| 35CG140 | 0.35 | 0.97 | 1.24 | 1.40 | 1.75 | 0.960 |
| 35CG145 | 0.35 | 1.00 | 1.27 | 1.45 | 1.75 | 0.960 |
| 35CG150 | 0.35 | 1.03 | 1.30 | 1.50 | 1.75 | 0.960 |
| 35CG155 | 0.35 | 1.06 | 1.41 | 1.55 | 1.75 | 0.960 |
| 35CG165 | 0.35 | 1.11 | 1.52 | 1.65 | 1.75 | 0.960 |
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 50 Hz |
Maximum Specific Total Loss at 1.7 T W/kg 60 Hz |
Minimum Polarization in Tesla at a Field Strength of 800 A/m | Minimum Stacking Factor |
|---|---|---|---|---|---|
| 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 | 1.10 | 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 | 1.28 | 1.85 | 0.945 |
| 27HP85d | 0.27 | 0.85 | 1.10 | 1.85 | 0.950 |
| 27HP90d | 0.27 | 0.90 | 1.14 | 1.85 | 0.950 |
| 27HP95d | 0.27 | 0.95 | 1.19 | 1.85 | 0.950 |
| 27HP100 | 0.27 | 1.00 | 1.25 | 1.85 | 0.950 |
| 30HP95 | 0.30 | 0.95 | 1.22 | 1.85 | 0.955 |
| 30HP100 | 0.30 | 1.00 | 1.32 | 1.85 | 0.955 |
| 30HP105 | 0.30 | 1.05 | 1.37 | 1.85 | 0.955 |
| 30HP110 | 0.30 | 1.10 | 1.42 | 1.85 | 0.955 |
| 35HP110 | 0.35 | 1.10 | 1.42 | 1.85 | 0.960 |
| 35HP115 | 0.35 | 1.15 | 1.50 | 1.85 | 0.960 |
| 35HP120 | 0.35 | 1.20 | 1.55 | 1.85 | 0.960 |
| 35HP125 | 0.35 | 1.25 | 1.64 | 1.85 | 0.960 |
| 35HP135 | 0.35 | 1.35 | 1.77 | 1.88 | 0.960 |
NOTES
- 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.
- 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.
- 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.