Product Introduction |
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This most widely used prepainted steel sheet is covered with
polyester paint material that is baked on to its surface. Polyester
prepainted steel sheet is used for exterior panels and interior
design purposes that do not require excessive processing.
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Prepainted steel sheet is coated or baked with paint
containing polyester resin.
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Most widely used. Generally displays superior workability,
durability, and weather resistance
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Used for a variety of purposes; offered in a wide
array of colors and degrees of polish.
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- Sandwich panel, lightweight partition, roof panel, water gutter,
shutter, door, boiler cover, iron frame furniture
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Cross section of painted product |
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Note 1) Materials used for prepainted steel sheet: GI, GA, EGI,
SGL, AL, BP, TFS, TP, SUS, ALCOT etc.
Note 2) 2COAT 2BAKING
is available for coating layer on both the top and back sides.
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Applied materials |
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Hot-dip galvanized steel sheet (KS D 3506, GI)
The
cold rolled steel sheet passes through a molten zinc pot containing
97% zinc (0.03% or less AL), undergoing the galvanizing process,
which gives each side of the sheet an equal thickness of coating.
Depending
on the surface treatment of the plated sheet, it is categorized
into regular spangle, minimized spangle, or zero spangle ultra smooth,
which are symbolized as R, M, Z, respectively. Prepainted steel
sheet produced by Dongbu Steel uses ultra smooth material in the
production process.
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Surface types for hot-dip galvanized steel sheet (GI)
While an increased volume of coating enhances the anti-corrosion
properties of galvanized steel sheet, the workability is inevitably
decreased. Anti-corrosion properties, workability, tension, and
elongation must be taken into consideration when selecting plates.
| 1) |
The normal wall thickness of galvanized steel plates
refers to the thickness of pre-coated steel plates.
The clearance of the machine, therefore, must account
for the thickness of the zinc plating indicated in Table
1 as well as the coating thickness (usually 25μ).
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Zinc flacks may stick inside the metallic pattern
during the deep drawing process, requiring extra caution
be taken as this may damage the coating's exterior
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Lubrication oil used in treatment shall not contain
chlorine or phosphoric acid, which reacts to zinc. Table
1 shows the zinc weight and coating thickness for hot-dip
galvanized steel sheet used for prepainted steel sheet.
These figures are adopted by KS (Korean Standards),
JIS (Japan Industrial Standards), and ASTM (American
Society for Testing Materials).
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Table 1 - Weight and thickness of zinc coating
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Zinc Coating Weight Symbol
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Z 06 |
Z 08 |
Z 13 |
Z 12 |
Z 18 |
Z 20 |
Z 22 |
Z 26 |
Z 27 |
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Zinc Coating Thickness (㎜)
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0.013 |
0.017 |
0.021 |
0.026 |
0.034 |
0.040 |
0.043 |
0.049 |
0.054 |
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Weightg/㎡ (both sides)
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90 |
120 |
125 |
183 |
244 |
285 |
305 |
345 |
381 |
| ASTM A 525 |
G-30 |
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G-40 |
G-60 |
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G-90 |
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G-115 |
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Special hot-dip galvanized steel sheet (KS D 3770, SGL)
Zn/AL
alloy coated steel sheet and galvanized sheet, is available
for products requiring particularly high-workability and high-durability.
Table 2 lists the applications and contents of these sheets.
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Table-2 Applications of Zn/AL alloy coated steel sheet
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Type
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Application
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Remarks
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Regular hot-dip galvanized iron
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Regular use
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| 1% Zn/AL Alloy Coated Steel Sheet |
CRACK FREE |
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| 5% Zn/AL Alloy Coated Steel Sheet |
Anti-corrosion, workability
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GALFAN |
| 55% Zn/AL Alloy Coated Steel Sheet |
Construction in poor conditions
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SUPERGALUM (Dongbu Steel Brand) GALVALUME
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Electrolytic galvanized steel sheet (KS D 3528, EGI)
The
surface of the cold rolled steel sheet (KS D 3512) undergoes a dull
finishing treatment, followed by a double-sided coating process
(zinc weight: 13g~25g/㎡). Five products are available depending
on the coating weight. Electro galvanized iron (EGI) is usually
used in home electrical appliances that require extensive workability.
Due to its low zinc weight, EGI cannot be used for products that
require anti-corrosion properties.
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Aluminum steel sheet (KS D 6701)
While aluminum is
light in specific gravity, it possesses high tensile strength. Due
to its superb anti-corrosion properties, aluminum is widely used
in the production of aircrafts, automobiles, containers, blinds,
ceiling material, and composite panels.
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Cold rolled stainless steel sheet (KS D 3698)
Due to
its anti-corrosion and chemical resistant properties that far exceed
other steel products, stainless steel sheet is optimum for products
that require extremely high levels of corrosion resistance and durability.
Stainless
steel sheet is produced from Iron/Chrome or Nickel/Chrome
alloy. STS 304 or STS 430 are used mainly for PCM (JIS uses the
symbol SUS).
| Raw Materials |
Size |
Related
specification |
Characteristics |
| Thickness |
Width |
| COLOR ROLLED STEEL(CR) |
0.25~1.6t |
600~1380㎜ |
ASTM A-366
KS D 3512
JIS G 3141 |
Excellent formability
Excellent weldability
Excellent
surface
Bright surface |
| HOT DIP GALVANIZED STEEL(GI) |
0.25~1.6t |
600~1380㎜ |
ASTM A-526
KS D 3506
JIS G 3302 |
Corrosion Resistance |
| ELECTROLYTIC GALVANIZED STEEL(EGI) |
0.35~1.6t |
600~1380㎜ |
ASTM A-591
KS D 3528
JIS G 3313 |
Excellent formability |
| GALVANNEALED STEEL(GA) |
0.35~1.6t |
600~1380㎜ |
ASTM A-526
KS D 3506
JIS G 3302 |
Good Weldability
Corrosion Resistance |
HOTDIP
ALUMINIZED STEEL(AL-COT) |
0.35~1.6t |
600~1380㎜ |
ASTM A-463
KS D 3544
JIS G 3314 |
Heat Resistance
Corrosion Resistance
Heat
Reflectiveness |
| BLACK PLATE(BP) |
0.25~0.6t |
600~1380㎜ |
ASTM A-623
KS D 3516
JIS G 3303 |
Excellent Lackerability
Excellent Workability
Heat
Resistance |
| ALUMINUM STEEL(AL) |
0.3~1.6t |
600~1380㎜ |
ASTM B-209
KS D 6701
JIS G 4000 |
Corrosion Resistance
High Durability |
| STAINLESS STEEL(STS) |
0.3~1.6t |
600~1380㎜ |
ASTM A-895
KS D 3698
JIS G 4305 |
Corrosion Resistance
High Durability
Chemical
Resistance |
SuperGalum
(SGL) |
0.3~1.6t |
600~1380㎜ |
ASTM A-792
KS D 3770
EN 10215 |
Heat Resistance
Corrosion Resistance
Heat
Reflectiveness
High Durability |
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Size availability |
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Test items |
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| Test item |
Test method |
Test result |
Related specification |
| Cross cut test |
100/100 TAPING TEST
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Good |
KS D 3520 |
| Pencil Hardness test |
45˚, 1H and over |
Good |
KS D 3520 |
| Bending test |
180˚×3T |
Good |
KS D 3520 |
| Impact test |
500g×12.7㎜φ×500㎜H |
Good |
KS D 3520 |
| Salt water spray test |
5%Nacl 35˚ |
500hours
Good |
KS D 9520
JIS Z 2371 |
| Resistance to Chemicals |
5%H₂SO₄×5Hr
5%NaOH×5Hr |
Good
Good |
DS-B-I-1112 |
Accelerated
weathering test |
Weather-O-Meter |
750hours
Good |
JIS Z 0230 |
| Film Hardness test |
M.E.K Rubbing |
40Times
Good |
DS-B-I-1112 |
※ Test standards can be altered
according to cutting thickness and color. |
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Applied specifications |
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KS D 3520, KS D 6711
JIS G 3312, JIS G 3321
ASTM A 653, ASTM A 792
EN 10142, EN 10147 etc
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Basic color |
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