A)
MATERIAL: Cold Rolled Full Hard Coils.
B) STEEL GRADE: Material should be suitable for production
hot dip galvanized coils with CQ grades after processing in
continues hot dip galvanizing line.
C) CHEMICAL ANALYSIS: According to below table.
|
-
|
%
C
|
%
Mn
|
%
S
|
%
P
|
%
Cu
|
%
Si
|
%
Al
|
%
Ni
|
%
N (ppm)
|
%
Ti
|
%
Cr
|
|
Min
|
0.04
|
0.25
|
-----
|
-----
|
-----
|
-----
|
0.03
|
-----
|
20
|
-----
|
-----
|
|
Max
|
0.06
|
0.35
|
0.25
|
0.03
|
0.04
|
0.03
|
0.06
|
-----
|
100
|
-----
|
-----
|
D) DIMENSIONS
& ITEM WEIGHT: According to attach table 2.
E) DIMENSIONAL TOLERANSE :
Tickness according to JIS G3141(Class
A) WIDTH : 0 /+ 5 mm
F) SURFACE APPEARNCE:
The surface would be free from defect like pores, holes,
roll marks, screatches, silvers, scabs, milled in scales,
laminations, edge wave, black patches, oil patches, piting,
cracked or porn out edge.
G) ROUGHNESS: 0.5 - 2(micron)
H) HAREDNESS: Min: 85 HRB
I) ANOTHER IMPORTANT SPECFICATION
- Edge condition: Trimmed edge (In packing line)
- Coil outer diameter: Max 2050 mm
- Coil inner diameter: 610 mm
- Coil weight: 12-18 (ton)
- Camber = 0.2 % (Max)
- Contamination of strip:
- 200 mg/m2 Iron fine
(Max)
- 150 mg/m2 Iron fine
(Max)
- No edge crack
- No collapsing inner diameter
- No telescopic extent on coil crown
- Cold reduction: % 50 - % 90
- Flatness: No wave on edge (Strip bulking Max 3 mm)
