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

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.

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

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

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

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

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

Scope of Manufacturing Field Post-treament Chromated Oiled Chromated & Oiled No Treatment ○ Chromating - Average : 11.5mg/m2(one side) - Range : 6.8-18.9mg/m2(one side) Oiling - Slightly : 500-800mg/m2(one side) - Normal : 1,000-1,400mg/m2(one side) - Heavy : 1,400-2,000mg/m2(one side)

Specification Grade and Symbol Class JIS G3314 ASTM A 463 ASTM A 463-96a 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

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

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

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↑