|
|
|
 Product Features |
| Hot-dip aluminum coated steel sheet combines the mechanical properties of cold-rolled steel sheet with aluminum¡¯s high resistance retention, heat reflection, and superior rust resistance. Dongbu Steel produces hot-dip aluminum coated steel sheet under the brand name ALCOT. |
| Dongbu Steel was awarded the Jang Young Sil award in September 1992 in recognition of our top-quality technology, research endeavors in pursuit of original and independent technology parallel to that of advanced nations, and contributions to replacing imported materials with Korean products.
|
 Superior Heat Resistance |
| Lengthy exposure to temperatures up to 450 degrees Celsius causes very little change in ALCOT and does not affect its attractive surface brightness, compared with galvanized steel sheet and cold-rolled steel sheet.
|
 Heat Resistance Test Results |
Test conditions: Naked eye comparison the sheet after two rounds of test procedures (Heating (1.5 Hr), maintaining (5 Hr), cooling (17 Hr))
| |
300¡É |
350¡É |
400¡É |
450¡É |
500¡É |
550¡É |
600¡É |
| ALCOT |
¡Û |
¡Û |
¡Û |
¡Û |
¡Û |
¡Û~¡â |
× |
| GALVALUME |
¡Û |
¡Û |
¡â |
¡â~× |
× |
× |
× |
| GI |
¡â |
¡â~× |
× |
× |
× |
× |
× | ¡Û : No change ¡â : Luster down × : Tums
blackish
|
| Heat Resistant Equipment using ALCOT steel |
When heated, an oxide film is formed on the surface as the alloy layer is activated, protecting its surface.
|
| Superior Heat Reflectivity |
| The highly elegant surface of ALCOT reflects about 80% of the heat at a temperature of 450 degrees Celsius. Its reflection rate goes up to 95% where infrared rays are present. This makes ALCOT the ideal choice for producing the heat reflector plates in toasters, ovens, gas ranges and oil stoves.
|
| Heat Reflectivity |
|
Classification
|
ALCOT |
GI |
| 100¡É×24hr |
80% |
80% |
450¡É×24hr
|
80% |
15% |
|
| |
| Coating Layers |
| Types of ALCOT steel sheet are categorized by the components of the molten pot. Applications are as follows |
|
Clssification |
Type
¥°Alumininized
|
Type
¥±Alumininized |
|
components of the molten pot. |
Al-Si(8~10%)
|
Al |
|
Components of the alloy layer |
 |
 |
|
Application |
Heat resistance treatment |
Weather resistance (construction material) |
|
| |
| Cross section of ALCOT steel sheet of the coated layers |
Dongbu Steel produces Type 1 Aluminized Steel Sheet |
| |
| Production Availability |
| Production Availability |
 |
| Production Availability by Coating Weight |
|
| Post-treatment |
Chromated
|
Oiled |
Chromated & Oiled |
No Treatment |
| ¡Û |
¡Û |
¡Û |
¡Û |
¡Ø Chromating
- Average : 11.5 mg/m² (one side)
- Range : 6.8~18.9mg/m²
(one side)
¡Ø Oiling
- Slightly : 500~800mg/m² (both side)
- Normal :
1,000~1,400mg/m² (both side)
- Heavy : 1,400~2,000mg/m² (both side)
|
| Post-treatment |
| Class |
JIS G3314 |
ASTM A 463 |
ASTM A 463-96a |
EN 10154 |
Commercial
Quality
(Type 1) |
CQ |
SA1C |
CQ |
CS TYPE A |
DX51D |
| CS TYPE B |
DX52D |
| CS TYPE C |
Drawing
Quality
(Type 1) |
DQ1 |
SA1A |
ADQ |
- |
DX53D |
| DQ2 |
SA1D |
DQ |
FS |
DX54D |
| DDS |
DX55D |
| DQ3 |
SA1E |
DQSK |
EDDS
|
- |
| EDDQ |
- |
EDDQ
|
EDDS |
- |
Structural
Quality
(Type 1) |
Grade A |
SAC31
|
SQ-A |
Grade 230 |
- |
| Grade B |
SAC35
|
SQ-B |
Grade 255 |
S250GD |
| S280GD |
| Grade C |
SAC41
|
SQ-C |
Grade 275 |
S320GD |
| Grade D |
SAC45
|
SQ-D |
Grade 340 Class1 |
S350GD |
| Grade 340 Class2 |
| Grade F |
|
- |
Grade 340 Class3 |
- |
| Grade E |
- |
- |
Grade 550 |
- |
|
| Mechanical Properties |
| Class |
Tensile
Strength
(§¸/§±) |
Yield Point
(§¸/§±) |
Elongation(%) |
| Thickness(§®) |
Thickness(§®) |
| T¡Â0.5 |
0.5£¼ t |
t¡Â0.5 |
0.5£¼ t¡Â1.2 |
1.2£¼ t |
Structural Quality
(Type1) |
Grade A |
SAC31, SQ-A |
31min |
21min |
21min |
20min |
20min |
20min |
| Grade B |
SAC35, SQ-B |
35min |
25min |
25min |
20min |
20min |
20min |
| Grade C |
SAC41, SQ-C |
41min |
30min |
30min |
18min |
18min |
18min |
| Grade D |
SAC45, SQ-D |
45min |
37min |
37min |
18min |
18min |
18min |
|
| Management standards for mechanical properties defined by Dongbu Steel |
|
Type
|
Hardness
(HR30T) |
Y.P(§¸/§±) |
T.S(§¸/§±) |
EI(%) |
| ~0.5 |
0.5~2.3 |
~0.5 |
0.5~1.2 |
1.2 & over |
| SA1C |
65¡é |
26~36 |
36~42 |
|
34~40 |
|
| SA1D |
50¡é |
24¡é |
23¡é |
28¡è |
36¡è |
38¡è |
40¡è |
| SA1E |
48¡é |
21¡é |
20¡é |
28¡è |
38¡è |
40¡è |
42¡è |
|
|
| Applications |
| Automotive components : muffler, exhaust pipes, fuel tanks |
 |
| Home Electriacal Appliances : Electric stove, gas range, bread machine, electric stove, toaster, frying pan, dryer |
 |
| Heating equipment : heat exchanger, stovepipe, pre-heater, dryer, duct |
| Construction : Walls and roofs of chemical factories, fireproof wall |
| Other : Steam cover, other chemical equipment |
| ¡Ø Dongbu Steel conducts sales of products applied to automotive exhaust systems; home electrical appliances such as air conditioners, boilers, gas ovens, rice cookers and Braun tube bands; and construction materials such as deck, wall parts, and roofing material. To satisfy our customer's needs, we continue to develop material and technology, enabling us to maintain a world-class line of products, with quality equal to that of our global competitors. |
|
| Applied Specifications |
KS D 3544
JIS G 3314
ASTM A 525 (FOR ASTM A463)
EN 10143
|
|
| Production process |
| Click on the image to view the production process. |
|
|
