Technical Specifications

Technical Specifications

Characteristics of CRGO electrical steel are affected by impurities, grain size, grain orientation and surface insulation. Even minor stresses, burrs, edge cambers or bends can increase core losses and magnetizing current significantly. Jaybee Laminations has the facilities to ensure proper handling and stress free processing of the material.

General physical and mechanical properties of CRGO steel
Density 7.65 g/cm3
Thickness of sheet 0.23 - 0.35 mm
Silicon content 3-4 %
Yield Point (relative to rolling direction) 0 degrees • 330 N/mm2    90 degrees • 355 N/mm2
Tensile strength 0 degrees • 348 N/mm2    90 degrees • 412 N/mm2
Elongation 0 degrees • 11%                90 degrees • 31%
Number of bends 0 degrees • 21                   90 degrees • 15
Hardness (Hv) 204
Stacking factor 95-98%

Grade classification of CRGO steel

Grade (BIS nomenclature) Grade (conventional nomenclature) Thickness(mm) Max. Core loss (W/kg) 50Hz
@1.5T @1.7T
23HP85 23ZDKH 0.23 0.60 0.85
23HP90 23M0-H 0.23 0.64 0.90
23HP95 23M0-H 0.23 0.66 0.95
23HP100 23M0-H 0.23 0.68 1.00
23CG110 M3 0.23 0.70 1.10
27HP95 27ZDKH 0.27 0.66 0.95
27HP100 27M0-H 0.27 0.70 1.00
27HP110 27M0-H 0.27 0.78 1.10
27CG120 M4 0.27 0.85 1.20
27CG130 M4 0.27 0.90 1.30
30HP105 30M0-H 0.30 0.75 1.05
30CG130 M5 0.30 0.90 1.30
30CG140 M5 0.30 0.95 1.40

Tolerance chart for dimensions of CRGO laminations (as per IS 3024)

Attribute Attribute Range/Value Tolerance
Width 0 - 100 mm
100 mm - 230 mm
230 mm - 400 mm
400 mm - 750 mm
+0.00 / -0.15 mm
+0.00 / -0.20 mm
+0.00 / -0.30 mm
+0.00 / -0.50 mm
Length 0 - 350 mm
350 mm - 1,000 mm
1,000 mm - 2,000 mm
2,000 mm - 3,000 mm
3,000 mm - 4,000 mm
+0.00 / -0.30 mm
+0.00 / -0.60 mm
+0.00 / -1.00 mm
+0.00 / -1.50 mm
+0.00 / -2.00 mm
Thickness 0.23 - 0.27 mm
0.30 - 0.35 mm
+/- 0.025 mm
+/- 0.030 mm
Mitering Angle 45 degrees +/- 5 minutes
Burr Height 0.18 - 0.23 mm
0.23 - 0.30 mm
0.30 - 0.35 mm
10 microns
15 microns
20 microns
Wave Factor Material width > 150mm,
Flatness deviation
Max. 1.5% of width
Edge Camber Material width > 150mm Max. 0.8 mm
for length of 1.5m
Hole Dimension Up to 34 mm +/- 0.15 mm
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