|
1. Hot Rolled Steel
Sheet and Coil for Drawing
 |
The standard set forth for POSCO's hot-rolled
coil for cold-rolled deep drawing.
|
Code
|
Thickness
(mm)
|
Chemical Composition(wt%)
|
|
C
|
Si
|
Mn
|
P
|
S
|
Sol-Al
|
Others
|
|
POSHRD3
|
1.6 and over
5.99 and under
|
0.005 and under
|
0.02 and under
|
0.20and under
|
0.02and under
|
0.015and under
|
0.02~0.06
|
Ti:0.03~0.06 N:0.03 and under
|
Remark :
|
1. Dimension, form, weight,
external appearance and allowances comply with ASTM
A568. |
| |
2. This standard guarantees
chemical composition, not mechanical properties. |
|
2. High-Strength
Atmospheric Corrosion Resistant Hot-Rolled Steel Sheet and
Coil
|
This specification is set forth for POSCO's
high-strength, atmospheric corrosion resistant hot-rolled
steel sheet and coil.
|
Code
|
Thickness
(mm)
|
Chemical Composition (wt%)
|
|
C
|
Si
|
Mn
|
P
|
S
|
Others
|
|
PAWS50
|
6.0and under
|
0.12and under
|
0.15~0.35
|
0.90and under
|
0.060~0.12
|
0.035and under
|
Ti:0.15 and under Cu:0.25~0.50
|
|
Code
|
Yield Point
(kgf/m²)
|
Tensile Strength
(kgf/m²)
|
Elongation
|
Bending Test
|
|
Test Piece
|
(%)
|
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PAWS50
|
40 and over
|
50 and over
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No.5, Rolling Direction
|
22 and over
|
0.5t(No. Sa, Rolling Direction)
|
|
|
1.5t(No. Sa, Rolling Direction)
|
Remark :
|
1. Exterior appearance,
form, dimension, weight and allowances comply with
KS D 3500. |
| |
2. Number of tension and
bending test pieces: One for each steel sheet with
the same molten steel and thickness. However, in
excess of 50 tons, two pieces are used for each
test. |
|
3. Hot-Rolled Steel Sheet and Coil
for Perforative Corrosion Resistant Steel Pipes
|
This specification is set forth for POSCO's
hot-rolled steel sheet and coil for perforative corrosion
resistant steel pipes.
|
Code
|
Thickness
(mm)
|
Chemical Composition (wt%)
|
|
C
|
Si
|
Mn
|
P
|
S
|
Others
|
|
PACOS1
|
2.5~4.5
|
0.10 and under
|
0.35 and under
|
0.25~0.50
|
0.023 and under
|
0.005 and under
|
Cu:0.10~0.30
Ca:0.001 and over
|
|
PACOS2
|
1.2~9.0
|
0.18 and under
|
0.25~0.60
|
|
Code
|
Tensile Strength
(kgf/m²)
|
Elongation (%)
|
Bending Test
|
|
1.2mm and over, Under
1.6mm
|
1.6mmand over Under
3.0mm
|
3.0mm and over, Under
6.0mm
|
6.0mm and over, Under
13.0mm
|
Test Piece
|
Under
3.0mm
|
3.0mm and over
|
|
PACOS1
|
30and over
|
30and over
|
32and over
|
35and over
|
37and over
|
and over
|
Closed
|
0.5t
|
|
PACOS2
|
35and over
|
27and over
|
27and over
|
30and over
|
32and over
|
1.0t
|
1.5t
|
Remark :
|
1. External appearance,
form, dimension, weight and allowances comply with
KS D 3555 (hot-rolled carbon steel strips for tubes).
|
| |
2.Number of tension and
bending test pieces: Same as the above. |
| 3.Bending test piece:
KS No. Da, rolling direction |
|
4. Hot-Rolled Steel
Sheet and Coil for Automotive Structural Uses
|
This specification is set forth for POSCO's
hot-rolled steel sheet and coil for automotive structural
uses.
|
Code
|
Thickness
(mm)
|
Chemical Composition (wt%)
|
|
C
|
Si
|
Mn
|
P
|
S
|
Nb
|
|
ATOS55
|
4.5~12.7
|
0.20and under
|
0.40and under
|
1.50and under
|
0.030and under
|
0.030and under
|
0.050and under
|
|
ATOS60
|
3.2~12.7
|
|
Code
|
Tension Test
|
Bending Test
|
|
Tensile Strength
(kgf/m²)
|
Yield Point
(kgf/m²)
|
Elongation (Rolling Direction,
%)
|
Bending Angle
|
Inner Diameter
|
Test Piece
|
|
Test Piece No.5, 2.5~5.0
|
Test Piece No.5,
5.0~6.3
|
Test Piece No.5,
6.3~12.7
|
|
ATOS55
|
55 and over
|
35 and over
|
20 and over
|
21 and over |
14 and over
|
180°
|
1.5t
|
No.3, Perpendicular to rolling
direction
|
|
ATOS60
|
60 and over
|
40 and over
|
19 and over
|
20 and over |
13 and over
|
Remark :
|
1.External appearance,
form, dimension, weight and allowances comply with
KS D 3519. |
| |
2. Number of tension and
bending test pieces: Same as the above |
| 3. Bending test piece:
KS No. Da, perpendicular to rolling direction |
|
5. Hot-Rolled Steel
Sheet and Coil for Automobile Impact Beam
|
|
Code
|
Thickness
(mm)
|
Chemical Composition (wt%)
|
|
C
|
Mn
|
S
|
Sol-Al
|
Cr
|
Ti
|
B
|
|
AUTOBEAM
|
1.6~5.0
|
0.30 and under
|
1.50 and under
|
0.005 and under
|
0.12 and under
|
0.10 and over
0.30 and under
|
0.050 and under
|
0.0050 and under
|
|
Code
|
Tensile Strength
(kgf/m²)
|
Bending Test
|
Remark
|
|
Bending Angle
|
Inner Diameter
|
|
AUTOBEAM
|
50 and over,
Under 80
|
180°
|
1.5t
|
Steel pipes pass through proper
heat treatment to come out as finished products.
|
Remark :
|
1. Surface, form, dimension, weight
and allowances comply with KS D 3500. |
| |
2. Number of tension and bending
test pieces: One piece for each steel sheet with
the same molten steel and thickness. However, in
excess of 50 tons, two pieces are used for each
test. |
|
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