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CRGO info

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.

Conventional CRGO grades generally M3,M4,M5 and M6 are used regularly for Lamination 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 and other CRGO producing mills 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. Above table gives magnetic properties of Hi-B material. Popular CRGO Hi-B grades used are 23 MOH & 27 MOH.     

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 CRGO 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 1.050mm (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

  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 0.20 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 steel strips (width 75mm over).

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