Cold
Rolled Sheets/Coils.
Sizes
Thickness: |
0.3 to 2.5mm |
Width: |
700 to 1500mm |
Lengths: |
1 to 4 meters |
Coil inner dia: |
600mm |
Coil outer dia: |
1800mm (max) |
Max. coil weight |
14.5 tons |
Min. pack weight |
5.0 tons |
Specification Of Cold Rolled Steel Flat Products Grades
Steel
Quality |
Steel
Grade |
Chemical
Composition (Cast Analysis) % |
Mechanical
Properties |
Ref.
Standard |
C
Max |
Mn
Max |
Si
Max |
P
Max |
S
Max |
Al
Min |
Yield
Stress
Min.
(N/mm2) |
Tensile
Strength
Max.
(N/mm2) |
Elong'n
%
Min.
Lo=50
mm |
180
Bend
Mandrel
Dia. |
|
HRB |
HR
30T |
Commercial |
CR-1 |
0.15 |
0.60 |
- |
0.05 |
0.05 |
- |
- |
- |
- |
0a |
65 |
- |
ISO
3574-70 |
Drawing |
CR-2 |
0.12 |
0.5 |
- |
0.04 |
0.04 |
- |
- |
370 |
31 |
- |
57 |
55 |
-do- |
CR-3 |
0.10 |
0.45 |
- |
0.03 |
0.03 |
- |
- |
350 |
35 |
- |
53 |
52 |
-do- |
CR-4 |
0.08 |
0.45 |
- |
0.03 |
0.03 |
- |
- |
340 |
37 |
- |
50 |
50 |
-do- |
SPCC |
- |
- |
- |
- |
- |
- |
- |
270
min |
32 |
- |
- |
- |
JIS
G 3141-91 |
SPCD |
- |
- |
- |
- |
- |
- |
- |
270
min |
34 |
- |
- |
- |
-do- |
|
Structural
|
CR-220 |
0.15 |
- |
- |
0.05 |
0.05 |
- |
220 |
300
min |
22 |
1a |
- |
- |
ISO
4997-83 |
CR-250 |
0.20 |
- |
- |
0.05 |
0.05 |
- |
250 |
330
min |
20 |
2a |
- |
- |
-do- |
CR-320 |
0.20 |
1.50 |
- |
0.05 |
0.05 |
- |
320 |
400
min |
16 |
2a |
- |
- |
-do- |
1. Other steel grades can be produced
against specific orders.
2. 1 Kgf/mm2 = 9.80665 (N/mm2) MPa
Lo = gauge length of test piece in mm
a = Thickness of bend piece
Standard Sizes Of Cold
Rolled Sheet & Coils With Tempered (Trimmed) Edges
| Thickness,
mm |
0.45,
06, 08, 10, 12, 16, 20, 25 |
| Width,
mm |
915,
950, 1220, 1250 |
| Sheet
length per width, mm |
1830,
2440 |
Packet weight 10T and coil weight upto
15T. Coil and packet weight can be reduced upon mutual
agreement.
Standard Thickness Tolerances For Cold Rolled Sheets/Coils
(values in mm)
Specified
Widths |
Thickness
tolerances, over and under for specified thickness
|
Upto
&
Including
0.4 |
Over
0.4
Upto &
Including
0.6 |
Over
0.6
Upto &
Including
0.8 |
Over
0.8
Upto &
Including
1.0 |
Over
1.0
Upto &
Including
1.2 |
Over
1.2
Upto &
Including
1.6 |
Over
1.6
Upto &
Including
2.0 |
Over
2.0
Upto &
Including
2.5 |
600
upto and
including 1200 |
0.07 |
0.08 |
0.09 |
0.1 |
0.12 |
0.14 |
0.16 |
0.18 |
Over
1200 upto
and including 1500 |
0.08 |
0.09 |
0.1 |
0.11 |
0.13 |
0.15 |
0.17 |
0.20 |
Over
1500
|
- |
0.1 |
0.11 |
0.12 |
0.14 |
0.17 |
0.19 |
0.22 |
The thickness
tolerances for sheets in coil form are the same as for
sheets supplied in cut lengths, but in cases where welds
are present, the tolerances shall be double those given
over a length of 15m in the vicinity of the weld.
Special Thickness Tolerances For Cold Rolled Sheets/Coils
(values in mm)
Specified
Widths |
Thickness
tolerances, over and under for specified thickness
|
Upto
&
Including
0.4 |
Over
0.4
Upto &
Including
0.6 |
Over
0.6
Upto &
Including
0.8 |
Over
0.8
Upto &
Including
1.0 |
Over
1.0
Upto &
Including
1.2 |
Over
1.2
Upto &
Including
1.6 |
Over
1.6
Upto &
Including
2.0 |
Over
2.0
Upto &
Including
2.5 |
600
upto and
including 1200 |
0.04 |
0.045 |
0.055 |
0.065 |
0.075 |
0.09 |
0.11 |
0.125 |
Over
1200 upto
and including 1500 |
0.045 |
0.055 |
0.065 |
0.075 |
0.085 |
0.11 |
0.125 |
0.14 |
Over
1500
|
- |
- |
0.075 |
0.085 |
0.100 |
0.120 |
0.140 |
0.155 |
|
