Steel & Metal solution company

Coil Service Center

Customer Service Center
sws@saewoosteel.com
+82-2-761-0581

HOME  >  Coil Service Center  >  Introduction of Item

Introduction of Item

AL-COT(Hot Dip Aluminum Coated Steel Sheet)
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.
USAGE
Automotive components

muffler, exhaust pipes, fuel tanks

자동차 부품 이미지

Home Electrical Appliances

Electric stove, gas range, bread machine, electric stove, toaster, frying pan, dryer

전열기구 이미지

Heating equipment

heat exchanger, stovepipe, pre-heater, dryer, duct

Construction

Walls and roofs of chemical factories, fireproof wall

Other

Steam cover, other chemical equipment
DESCRIPTION

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))
Heat Resistance Test Results
category 300℃ 350℃ 400℃ 450℃ 500℃ 550℃ 600℃
ALCOT ○ ○ ○ ○ △ △ ×
GALVALUME ○ ○ △ △~× × × ×
GI △ △~× × × × × ×

○ : No change △ : 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.
a hot air balloon Description AL-COT steel
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
Heat Reflectivity
Type ALCOT GI
100℃×24hr 80% 80%
450℃×24hr 80% 15%
Heat reflectance graph image
설명

Coating Layers

Types of ALCOT steel sheet are categorized by the components of the molten pot. Applications are as follows

AL-COT 강판의 종류
Classification Type Ⅰ Alumininized Type Ⅱ Alumininized
components of the molten pot. Al-Si(8~10%) Al
Components of the alloy layer Type Ⅰ Aluminized Type Ⅱ Aluminized
Application Heat resistance treatment Weather resistance 
(construction material)
Cross section of ALCOT steel sheet of the coated layers

Photos of AL-COT tissue section steel

Production Availability

Production Availability

제조가능범위 그래프

Production Availability by Coating Weight

부착량에 따른 제조가능범위 그래프

Post-treatment
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
Grade and Symbol
Class JIS G3314 ASTM A 463 ASTM A 463-96a EN 10154
Commercial
Quality
(Type1)		 CQ SA1C CQ CS TYPE A DX51D
CS TYPE B DX52D
CS TYPE C
Drawing
Quality
(Type1)		 DQ1 SA1A ADQ - DX53D
DQ2 SA1D DQ FS DX54D
DDS DX55D
DQ3 SA1E DQSK EDDS -
EDDQ - EDDQ EDDS -
Structural
Quality
(Type1)		 Grade A SAC31 SQ-A Grade230 -
Grade B SAC35 SQ-B Grade255 S250GD
S280GD
Grade C SAC41 SQ-C Grade275 S320GD
Grade D SAC45 SQ-D Grade340 Class1 S350GD
Grade340 Class2
Grade F   - Grade340 Class3 -
Grade E -   Grade550 -
Mechanical Properties
Mechanical Properties
Class Tensile
Strength
(㎏/㎟)		 Yield Point (㎏/㎟) Elongation(%)
Thickness (㎜) Thickness(㎜)
T≤0.5 0.5＜ t t≤0.5 0.5＜ t≤1.2 1.2＜ 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
 

Applied Specifications

  • -KS D 3544
  • -JIS G 3314
  • -ASTM A 525 (FOR ASTM A463)
  • -EN 10143