2. ALCOT ALCOT is a Dongbu Steel brand name for
hot-dip aluminium coated steel sheets and coils.

3. Application 1. Automobiles : mufflers, exhaust pipes, fuel tanks, etc.
2. Combustion chambers, heat exchangers, dryers,
air conditioners, etc.
3. Home Appliances : boilers, gas ovens, toasters,
rice cookers, chimneys, grills, heaters, gas stoves,
a picture tube bands, microwave ovens,
rotisseries, etc.
4. Building Industries : decks, walls, roofs, etc.

5. Characteristics Heat Resistance Test condition
- Heating : 1.5hr
- Maintaining temperature : 5hr
- Cooling : 17hr
Judgement : Visual inspection after 2 cycles test.
Result
300℃
350℃
400℃
450℃
500℃
550℃
600℃
ALCOT ○
○∼△ ×
GALVALUME △ △× GI
△∼×
○ : No change △ : Luster down × : Tums blackish

6. Characteristics Heat Resistance Heat resistance mechanism for ALCOT
Heating
Heating
Before heating Al Al
High temperature
oxide film
Alloy layer
Alloy layer
Alloy layer Fe Fe Fe

7. Characteristics Heat Reflectivity Corrosion Resistance
(%)
ALCOT GI
100℃×24hr 80
450℃×24hr 15
Corrosion Resistance
Salt spray test : 5% Nacl 35℃
Hours to red rusting of 1㎛ of
coating thickness
- ALCOT : 100hrs
- GALVALUME : 70hrs
- GI : 20hrs

8. Scope of Manufacturing Field
Size Availability
subject to prior negotiation
available size range

9. Scope of Manufacturing Field
Coating Weight
subject to prior negotiation
available size range

10. Scope of Manufacturing Field
Post-treament
Chromated
Oiled
Chromated & Oiled
No Treatment ○
Chromating
- Average : 11.5mg/m2(one side)
- Range : mg/m2(one side)
Oiling
- Slightly : mg/m2(one side)
- Normal : 1,000-1,400mg/m2(one side)
- Heavy : 1,400-2,000mg/m2(one side)

11. Specification Grade and Symbol Class JIS G3314 ASTM A 463
ASTM A a
EN 10154
Commercial
Quality
(Type 1) CQ
SA1C
CS TYPE A
CS TYPE B
CS TYPE C
DX51D
DX52D
Drawing
DQ1
SA1A
ADQ -
DX53D
DQ2
SA1D DQ FS
DDS
DX54D
DX55D
DQ3
SA1E
DQSK
EDDQ
EDDS
Structural
Grade A
SQ-A
Grade 230
Grade B
SQ-B
Grade 255
S250GD
S280GD
Grade C
SQ-C
Grade 275
S320GD
Grade D
SQ-D
Grade 340 Class 1
Grade 340 Class 2
S350GD
Grade F
Grade 340 Class 3
Grade E
Grade 550

12. Specification Mechanical Properties Specification Class Tensile
Strength
(kg/mm2)
Yield Point
Elongation(%)
Thickness(mm)
t≤0.5
0.5＜t
t ≤0.5
0.5＜t≤1.2
1.2＜t
Commercial
Quality
(Type 1) CG
SA1C, CQ
28 min
21 min -
Drawing
DQ1
SA1A,
ADQ
26 max
25 max
34 min
36 min
38 min
DQ2
SA1D, DQ
24 max
23 max
40 min
DQ3
SA1E,
DQSK
21 max
20 max
42 min
EDDQ
SA1S,
(26 min)
19 max
18 max
44 min

13. Specification Mechanical Properties Class Tensile Strength (kg/mm2)
Yield Point
Elongation(%)
Thickness(mm)
T≤0.5
0.5＜t
t ≤0.5
0.5＜t≤1.2
1.2＜t
Structural
Quality
(Type 1)
Grade A
SAC31,
SQ-A
31 min
21 min
20 min
Grade B
SAC35,
SQ-B
35 min
25 min
Grade C
SA41,
SQ-C
41 min
39 min
30 min
18 min
Grade D
SA45,
SQ-D
45 min
37 min

14. Specification Mechanical Properties Dongbu Trend Hardness (HR30T)
Y.P(kg/mm2)
T.S
(kg/mm2)
El(%)
∼0.5
0.5∼2.3
0.5∼1.2
1.2 and over
SA1C
65↓
26∼36
36∼42
34∼40
SA1D
50↓
24↓
23↓
28↑
36↑
38↑
40↑
SA1E
48↓
21↓
20↓
42↑