इंटरनेट मानक
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
“ जान1 का अ+धकार , जी1 का अ+धकार ”
Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“ प0रा1 को छोड न' 5 तरफ ”
Jawaharlal Nehru
“Step Out From the Old to the New”
IS 3024 (2006): Grain orinted electrical steel sheets and strips [MTD 4: Wrought Steel Products]
“ !ान $ एक न' भारत का +नम-ण ”
Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“ !ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह
Bhart ṛ hari—N ī ti ś atakam
“Knowledge is such a treasure which cannot be stolen”
ह ”

AMENDMENT NO. 2 JUNE 2011
TO
IS 3024 : 2006 GRAIN ORIENTED ELECTRICAL
STEEL SHEET AND STRIP
(Second Revision)
( Page 1 , clause 3.14 ) — Substitute the following for the existing:
‘ Side Trimmed Coil — Material is side trimmed on both edges condition in the range of widths produced by suppliers’ manufacturing process.’
[ Page 2, clause 5.2
(a)] — Substitute the following for the existing:
‘a) Conventional grain oriented electrical steel tested at 1.7 Tesla values of maximum specific core losses are given in Table 1 and the values of maximum specific core losses at 1.5 Tesla given in
Table 1 are for information only.’
[
Page
3,
Table
1 ( see also Amendment No
. 1)] — Substitute the following for the existing table:
Price Group 2
1

Amend No. 2 IS 3024 : 2006
Table 1 Magnetic Properties of Conventional Grain Oriented (CGO) Electrical Steel
( Clauses 4.2, 5.2, 8.1 and 8.2)
Grade Nominal
Thickness mm
Maximum
Specific Core
Loss (W/kg)
Polarization at 1.5 T and
50 Hz
Maximum Specific
(1) (2) (3) (4) (5) (6)
23CG110 0.23 0.73
23CG120 0.23 0.77
23CG127 0.23 0.80
27CG120 0.27 0.80
27CG130 0.27 0.85
27CG140 0.27 0.89
30CG130 0.30 0.85
Core Loss (W/kg)
Polarization at 1.7 T and
50 Hz
1.10
1.20
1.27
1.20
1.30
1.40
1.30
Minimum
Polarization in Tesla at a
Field Strength of 800 A/m
Minimum
Stacking
Factor
1.78 0.945
1.78 0.945
1.75 0.945
1.78 0.950
1.78 0.950
1.75 0.950
1.78 0.955
30CG140 0.30 0.92
30CG150 0.30 0.97
35CG145 0.35 1.03
35CG155 0.35 1.07
35CG165 0.35 1.11
1.40
1.50
1.45
1.55
1.65
1.78 0.955
1.75 0.955
1.78 0.960
1.78 0.960
1.75 0.960
NOTES
1
The above samples are sheared longitudinal to the rolling direction and then stress relief annealed in a neutral or reducing atmosphere to develop magnetic property at 780°C to 820°C.
2 The values of Maximum Specific Core Loss (W/kg) at 1.5 T are for information only.

(
Page
4
, Table
2) — Substitute the following for the existing table:
Table 2 Magnetic Properties of High Permeability Grain
Oriented (HPGO) Electrical Steel
(
Clauses
5.2, 8.1 and
8.2)
Grade Nominal
Thickness mm
Maximum Specific
Core Loss (W/kg)
Polarization at 1.7 T and 50 Hz
Minimum
Polarization in Tesla at a
Field Strength of 800 A/m
Minimum
Stacking
Factor
(1) (2)
23HP85 d 0.23
23HP90 d 0.23
27HP90 d 0.27
27HP95 d 0.27
27HP100 0.27
27HP110 0.27
30HP105 0.30
30HP110 0.30
35HP115 0.35
35HP125 0.35
(3)
0.85
0.90
0.90
0.95
1.00
1.10
1.05
1.10
1.15
1.25
(4)
1.85
1.85
1.85
1.85
1.88
1.88
1.88
1.88
1.88
1.88
(5)
0.945
0.945
0.950
0.950
0.950
0.950
0.955
0.955
0.960
0.960
35HP135 0.35 1.35 1.88 0.960
NOTES
1 d This grade may be delivered in domain refined condition. The magnetic properties of some domain refined material may deteriorate when the material is subjected to heat treatment.
2 The domain refined grades need to be checked by single sheet method as in clause 14.3
.
( Page 4, Table 3, col heading 4) — Substitute ‘ohm–cm 2 / Lamination’ for ‘ohm–cm 2’
.
( Page 5 , clause 10.2) — Substitute the following for the existing
3

Amend No. 2 IS 3024 : 2006
‘ 10.2 Ductility
This test can be carried out by one of two methods described below.
10.2.1
The ductility shall be as high as practicable, when the application requires forming around a sharp radius during fabrication, an evaluation of the ductility is required. The ductility rating shall be determined in accordance with the test method described in IS 649. Ductility in following classes is typical for grainoriented material in any thickness and surface type when tested at the room temperature with a bend transverse to the rolling direction with following sheared specimens:
Ductility Class Permissible Number of Fractures on
Steel Base at Bend ( see Note)
1
2
3
1 total length not over 8 mm
2 total length not over 15 mm
≥ 3
NOTE — Based on 610 to 910 mm width of material. For widths less than 610 mm the number of permissible fractures should be reduced in proportion to the ratio of the width to 610 mm.
10.2.2
This alternate ductility test method is as described in IS 649 (Section 8, clauses
49
and
50
).
The minimum number of bends is one. The value applies to the parallel to the direction of rolling.’
(
Page
5,
clause 11.2
) — Insert the following at the end:
‘ , for widths up to and including 1 000 mm. For materials supplied with as rolled edges and/or widths above 1 000 mm the tolerances on nominal width should be the subject of agreement while ordering.’
( Page 6, Table 5) — Substitute the following for the existing table
4

Amend No. 2 IS 3024 : 2006
Sl No.
Table 5 Width Tolerance
( Clause 11.2)
Nominal Width, l, mm
Tolerances
(1) (2) (3) i) l
≤ 150 + 0
− 0
.
2
.
0
+ 0
− 0
.
3
.
0
+ 0
− 0
.
5
.
0
+ 1
− 0
.
0
.
0 v)
l >
1 000 + 1
− 0
.
5
.
0
NOTE — As per agreement, width Tolerance can be –ve or +ve or both –ve and +ve subject to tolerance band as given in above table.
( Page 6 , clause 14) — Insert the following as new subclauses at the end:
‘14.3 In the case where the measurement of magnetic polarization and specific core loss shall be made using single sheet method as specified in IS 649, the test specimen for the single sheet tester shall consist of one sheet having the following dimensions:
- Length 500 mm to 530 mm
NOTE — The value of 500 mm is recommended.
- Width 500 mm + 0 / – 5 mm.
All the test specimens shall be cut parallel to the direction of rolling. The permitted tolerance for the angle between the direction of rolling and the direction of cutting is ±1 degree.
14.4 In case of measurements of specific core loss on aged test pieces, these shall be aged by heating at
225 0 C ± 5 0 C for duration of 24 hours and shall be cooled to ambient temperature.’
5

Amend No. 2 IS 3024 : 2006
( Page 6, clause 15) — Insert the following as new subclause at the end:
‘
15.4
The required tests for domain refined grades, core loss to determine the core loss type (and for exciting current and peak permeability, when determined) shall be made in accordance with the test method described in IS 649, by means of a single sheet tester.’
(MTD 4)
Reprography Unit, BIS, New Delhi, India
6

AMENDMENT No. 3 NOVEMBER 2012
TO
IS 3024 : 2006 GRAIN ORIENTED ELECTRICAL STEEL
SHEET AND STRIP
(Second Revision)
[ Page 2, clause 5.2 (a) and (b) ( see also Amendment No.
2)] — Substitute the following for the existing:
‘a) Conventional grain oriented electrical steel tested at 1.7 Tesla and 50
Hz values, maximum specific core losses are given in Table 1. The values of maximum specific core losses at 1.5 Tesla and 50 Hz;at 1.5Tesla and
60Hz and at 1.7 Tesla and 60 Hz given in Table 1 are for information only.
b) High permeability grain oriented tested at 1.7 Tesla and 50 Hz, maximum specific core losses are given in Table 2. Maximum specific core losses at 1.7 Tesla and 60 Hz given in Table 2 are for information only.’
( Page 2, clause 7.2
) — Insert the following at the end of clause:
‘The additional thickness due to welds with respect to measured thickness of the steel sheet or strip shall not exceed 0.05 mm.’
[ Page 3, Table 1 ( see also Amendment No.
1 and 2)] — Substitute the following table for the existing table:
1

Amend No. 3 to IS 3024 : 2006
Grade
(1)
23CG110
23CG120
23CG127
27CG120
27CG130
27CG140
30CG130
30CG140
30CG150
35CG145
35CG155
35CG165
Nominal
Thickness mm
(2)
0.23
0.23
0.23
0.27
0.27
0.27
0.30
0.30
0.30
0.35
0.35
0.35
0.80
0.80
0.85
0.89
0.85
0.92
0.97
1.03
1.07
1.11
Maximum Specific
Core Loss (W/kg)
Polarization at 1.5 T
50 Hz 60 Hz
(3)
0.73
0.77
(4)
0.96
1.01
1.03
1.07
1.12
1.15
1.15
1.21
1.25
1.36
1.45
1.52
1.27
1.20
1.30
1.40
1.30
1.40
1.50
1.45
1.55
1.65
Maximum Specific
Core Loss (W/kg)
Polarization at 1.7 T
50 Hz 60 Hz
(5)
1.10
1.20
(6)
1.45
1.57
1.65
1.58
1.68
1.75
1.71
1.83
1.90
1.91
2.04
2.12
Table 1 Magnetic Properties of Conventional Grain Oriented (CGO)
Electrical Steel
( Clauses 4.2, 5.2, 8.1
and 8.2)
Minimum
Polarization in Tesla at a
Field Strength of 800 A/m
Minimum
Stacking
Factor
(7)
1.78
1.78
1.75
1.78
1.78
1.75
1.78
1.78
1.75
1.78
1.78
1.75
(8)
0.945
0.945
0.945
0.950
0.950
0.950
0.955
0.955
0.955
0.960
0.960
0.960
NOTES
1 The above samples are sheared longitudinal to the rolling direction and then stress relief annealed in a neutral or reducing atmosphere to develop magnetic property at between 780°C to
840°C, as recommended by the manufacturer.
2 The values of Maximum Specific Core Loss (W/kg) at 1.5 T are for information only.
3 The values of Maximum Specific Core Loss (W/kg) at 1.7 T and 60Hz are for information only.
2

Amend No. 3 to IS 3024 : 2006
[ Page 4 , Table 2 ( see also Amendment No. 2 )] — Substitute the following table for the existing table:
Table 2 Magnetic Properties of High Permeability Grain Oriented (HPGO)
Electrical Steel
( Clauses 5.2, 8.1
and 8.2)
Grade
23HP85
23HP90 d d
23HP95 d
23HP100 d
27HP90 d
27HP95 d
27HP100
27HP110
30HP105
30HP110
30HP120
35HP115
35HP125
35HP135
0.27
0.27
0.27
0.27
0.30
0.30
0.30
0.23
0.23
0.23
0.23
0.35
0.35
0.35
Nominal
Thickness mm
Maximum Specific Core
Loss (W/kg) Polarization at 1.7 T
1.00
1.10
1.05
1.10
1.20
50 Hz
0.85
0.90
0.95
1.00
0.90
0.95
1.15
1.25
1.35
60 Hz
1.12
1.19
1.25
1.32
1.19
1.25
1.32
1.45
1.38
1.46
1.58
1.51
1.64
1.77
Minimum
Polarization in Tesla at a
Field Strength of 800 A/m
(5)
1.85
1.85
1.85
1.85
1.85
1.85
1.88
1.88
1.88
1.88
1.88
1.88
1.88
1.88
Minimum
Stacking
Factor
(6)
0.945
0.945
0.945
0.945
0.950
0.950
0.950
0.950
0.955
0.955
0.955
0.960
0.960
0.960
NOTES
1 d This grade may be delivered in domain refined condition . The magnetic properties of some domain refined material may get deteriorate when material is subjected to heat treatment.
2 In cases where material gets deteriorated when subjected to heat treatment The domain refined grades need to be checked by Single sheet method as given in 14.3
. For other grades/other type of domain refined grades which do not deteriorate when subjected to heat treatment, the test method remains as per EPSTEIN method as given in IS 649.
3 The values of Maximum Specific Core loss (W/kg) at 60 Hz are for information only.
3

Amend No. 3 to IS 3024 : 2006
( Page 4, clause 9.1
, line 5 ) — Delete ‘and approximately’.
( Page 5, clause 11.1
) — Insert the following Note at the end of clause:
‘NOTE — Unless otherwise agreed the thickness tolerance for grade 23CG110 shall be
 0.025
 0.04
mm .’
( Page 6 clause 14.2
, line 4) — Substitute ‘7 80°C to 840°’C for ‘ 7 80°C to
820°C’.
(MTD 4)
4
Reprography Unit, BIS, New Delhi, India