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Hot Dip Aluminum Coated Steel Sheet (ALCOT)
PRODUCT INTRODUCTION
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 weldability
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℃ 350℃ 400℃ 450℃ 500℃ 550℃ 600℃
AL-COT ○~△ ×
Galvalume △~× × × ×
GI △~× × × × × ×
○ : No change △ : Luster down × : Tums blackish
Heat Resistance 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 Resistance Equipment using ALCOT steel
Classification ALCOT GI
100℃×24hr 80% 80%
450℃×24hr 80% 15%
COATING LAYERS
Types of ALCOT steel sheet are categorized by the components of the molten pot. Applications are as follows
Classification Type | Aluminized Type | Aluminized
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
※ Chromating
- Average : 11.5 mg/m² (one side)
- Range : 6.8~18.9mg/m² (one side)

※ Oiling
- Slightly : 500~800mg/m² (both side)
- Normal : 1,000~1,400mg/m² (both side)
- Heavy : 1,400~2,000mg/m² (both side)
Grade and Symbol
Class JIS G3314 ASTM A463 ASTM A463-96a 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 T.S (㎏/㎟) Y.P (㎏/㎟) El. (%)
t ≤ 0.5 0.5 < t t ≤ 0.5 0.5 < t ≤ 1.2 1.2 < t
Structural Quality
(Type1)
Grade A SA31, SQ-A 31min 21min 21min 20min 20min 20min
Grade B SA35, SQ-B 35min 25min 25min 20min 20min 20min
Grade C SA41, SQ-C 41min 30min 30min 18min 18min 18min
Grade D SA45, SQ-D 45min 37min 37min 18min 18min 18min
Management standards for mechanical properties defined by Dongbu Steel
Type Hardness (HR30T) T.S (㎏/㎟) Yield Point (㎏/㎟) Elongation (%)
~ 0.5 0.5 ~ 2.3 ~ 0.5 0.5 ~ 1.2 1.2 & over
SA1C 65↓ 36 ~ 42 26 ~ 36 34 ~ 40
SA1D 50↓ 28↑ 24↓ 23↓ 36↑ 38↑ 40↑
SA1E 48↓ 28↑ 21↓ 20↓ 38↑ 40↑ 42↑
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
※ 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
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