|
Major black plate types are the D, L, and MR types.
 |
 |
D steel is AL killed
steel and suitable for deep drawing or other works,
which are liable to create Luder's pattern. |
 |
L steel has very few
metalloids and residuum like Cu, Ni, Cr and Mo.
It is suitable for making containers with high corrosion
resistance. |
 |
It has few residual minor
constituents and good corrosion resistance. It is
used for a variety of purposes. |
|
1. Chemical Composition
|
|
Classification
|
Maximum Composition (%)
|
|
D Type
|
L Type
|
MR Type
|
|
C
|
0.12
|
0.13
|
0.13
|
|
Mn
|
0.60
|
0.60
|
0.60
|
|
P
|
0.020
|
0.02
|
0.02
|
|
S
|
0.05
|
0.02
|
0.05
|
|
Si
|
0.20
|
0.02
|
0.02
|
|
Cu
|
0.20
|
0.06
|
0.20
|
|
Ni
|
0.15
|
0.04
|
0.15
|
|
Cr
|
0.10
|
0.06
|
0.10
|
|
Mo
|
0.05
|
0.05
|
0.05
|
|
Other
|
-
|
-
|
-
|
|
2. Mechanical Properties
|
Mechanical properties of black plate are
determined by various factors, including steel composition,
rolling method, annealing method, skin pass, and temper
rolling. |
3. Temper Quality
|
|
Classification
|
Target Rockwell Hardness
30T
30T
|
Steel Type
|
Application
|
|
T-1
|
49±3
|
L, MR, D
|
It has
good deep-drawing, anti-aging, and mini-earing characteristics.
Due to superb ductility, it is used for deep drawing.
It is used to make aerosol tops, food can tops,
and portable gas containers |
|
T-2
|
53±3
|
L, MR, D
|
It has good drawing
anti-aging, and mini-earing qualities as well as
great ductility. It is used to make rings, plugs,
pail cans, and D&I cans. |
|
T-2.5
|
55±3
|
L, MR, D
|
It has similar properties
as T2. It is used to make battery bodies, small
tube bodies and lids, and D&I cans. |
|
T-3
|
57±3
|
L, MR, D
|
It has fine surface
and excellent workability. It is used to make bodies
and lids of general cans by light drawing. |
|
T-4
|
61±3
|
L, MR, D
|
It has fine surface
and excellent strength, thus is used to make cans
for carbonated beverages. |
|
T-5
|
65±3
|
L, MR
|
It has outstanding
cold- rolling strength and is used as substitute
for T4 and lowering gauge. |
|
|
