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
Thickness MM		KG/DM3	At 1.5T	At 1.7T	Minimum Induction at 800 A / m T
0.23	23ZDKH90	7.65		0.9	1.88
0.23 -0.009	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 -0.0106	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 -0.0118	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. )
	Width (Standard width available with range)	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
Width mm	Thickness mm	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
Thickness			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	97.5
		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	97.4
		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	98.0
		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	97.9
		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
0.30	12	30M-OH	1.05	0.74	1.01	0.44	0.60	1.91	98.3
0.35	11	35M-1H	1.16	0.85	1.13	0.52	0.68	1.92	98.5