 Model Number |
ASTM B117-73 |
This has plasticity and formability with silver-white, beautiful appearance and has much more excellent heat resistance and reflectivity than galvanized steel sheet with excellent durability in machined part so as to be used as roofing material and walls without being painted.
This is an aluminum galvanized steel sheet most ideally mixed in the ratio of aluminum and zinc.
Coating composition is 55% aluminum in weight ratio (80% surface volume ratio), 43.4% zinc, and 1.6% silicon, so that long-term corrosion resistance and heat resistance of aluminum and galvanic behavior effect of zinc may exert their characteristics most. Namely, this is a product that ideally combines both characteristics of aluminum steel sheet and galvanized steel sheet.
This has plasticity and formability with silver-white, beautiful appearance equal to the galvanized steel sheet, and the galvalume steel sheet has very little fine crack occurring on the die layer machined especially so as to be excellent in durability of machined part. Besides, the heat resistance is much more excellent than galvanized steel sheet and the heat reflectivity is 2 times more excellent than galvanized steel sheet so as to be used as roofing material and walls without painting to get energy saving effects. Galvalume steel sheets are excellent in adhesion with coating layer and paint, so ones for sign board and general use may be painted without weathering or post-treatment.
DURABILTY
1. Wet state tests
Test conditions: Investigation of surface change after exposure to the atmosphere of relative humidity 100%×49 ±1 âÂÂ
|
|
Specimen
|
Results
|
|
Attachment quantity
|
Coating thickness
|
|
Galvalume steel sheet
|
150g/ã¡
|
40μ(both sides)
|
No generation of red rust even after 35,300 hours pass
|
|
Galvanized steel sheet
|
275g/ã¡
|
40μ(both sides)
|
Generation of red rust before 6,000 hours
|
Test conditions: Drying for 2 hours after exposure to smoke ×55 â atmosphere for 22 hours…1 Cycle
|
|
After 22 days
|
After 75 days
|
After 116 days
|
|
|
Red rust (%)
|
Appearance
|
Red rust (%)
|
Appearance
|
Red rust (%)
|
Appearance
|
|
Galvanized
steel sheet
|
1
|
Generation of red rust on the cut surface
|
100
|
-
|
100
|
-
|
|
Al coated steel sheet
|
0
|
Trace of red rust on the cut surface
|
10
|
Generation of red rust on the cut surface
|
20
|
Generation of red rust on the cut surface and bends
|
|
Galvalume steel sheet
|
0
|
Surface bright
|
0
|
Surface dark
|
0
|
Generation of red rust on the cut surface
|
2. Salt water spray test
Test method: According to ASTM B117-73
|
|
Specimen attachment quantity
|
Red rust generation start time
|
|
Attachment quantity
|
Coating thickness
|
|
Galvalume steel sheet
|
150g/ã¡
|
40μ(both sides)
|
5,500 Hr
|
|
Galvanized steel sheet
|
275g/ã¡
|
40μ(both sides)
|
300 Hr
|
3. Production specification of galvalume steel sheets
|
Producible standards
|
Coating attachment quantity
|
Coating attachment quantity
|
|
Thickness(ãÂÂ)
|
0.35 ~ 2.3
|
AI-Zn alloy coating attachment quantity
|
Coating thickness μ
|
- Chromate treatment
|
|
Width (ãÂÂ)
|
600 ~ 1,270
|
100 g/ã¡
|
26
|
- Anti-print treatment (galva clean)
|
|
Length(ãÂÂ)
|
600 ~ 5,000
|
150ã¡
|
40
|
- Oiling
|
|
Unit weight (Max)
|
12 Ton
|
200ã¡
|
52
|
- Color resin galvalume steel sheet (cleanlume)
|
|
Coil inner diameter (ãÂÂ))
|
508
|
AI-Zn alloy coating attachment quantity
|
Coating thickness μ
|
- Lubricated galvalume steel sheet
|
|
- Transparent color galvalume steel sheet
|
4. Salt water spray test results
3,200Hr test
5. Outdoor exposure test(test for 13 years)
Specimen
- Galvalume steel sheet (attachment quantity 150g/ã¡)Unilume (Coating 150g/ã¡) - Galvanized steel sheet (attachment quantity 275g/ã¡)Galvanized (Coating 275g/ã¡)
Formability
This has the same plasticity and formability as galvanized steel sheets, and especially the galvalume steel sheets is very little in fine crack occurring on the die layer machined especially so as to be excellent in durability of machined part.
Heat resistance
The heat resistance of galvalume steel sheets is much more excellent than galvanized steel sheets and has almost similar characteristics to Al-coated steel sheets. - Galvanized steel sheets: When being used at high temperature, the recommended temperature is 230 â or less and it is discolored at 250 âÂÂ. - Galvalume steel sheets: This is not discolored even in case of being used for long time at 315 âÂÂ. Besides, this can be intermittently used up to 370 âÂÂ.
1. Comparison of corrosion resistance at high temperature
Analysis
- Galvalume steel sheet < Al-coated steel sheet in the 480âÂÂ~540 â temperature range - Galvalume steel sheet = Al-coated steel sheet in the 590 âÂÂ~650 â temperature range - Galvalume steel sheet > Al-coated steel sheet in the 700 â or higher temperature range
Welding property
1. Spot Welding condition
|
thickness (t)
|
Pressurization force (ãÂÂ)
|
Cooling time (Cycle=1/60 sec.)
|
Welding current
|
Electrode tip diameter(m)
|
|
Current (KA)
|
Energization time
|
Maintenance time
|
|
0.4
|
100
|
4
|
5.0
|
10
|
30
|
4.5
|
|
0.5
|
150
|
4
|
5.4
|
10
|
30
|
5.0
|
|
0.6
|
200
|
4
|
5.7
|
10
|
30
|
5.0
|
|
0.8
|
200
|
4
|
7.0
|
10
|
30
|
5.0
|
|
1.0
|
250
|
6
|
8.0
|
14
|
40
|
6.35
|
|
1.1
|
250
|
6
|
8.2
|
14
|
40
|
6.35
|
|
1.5
|
300
|
6
|
9.0
|
14
|
40
|
6.35
|
â» Legends:1 current before differentiation ;4KA, energization time ;8 CYCLE,SQUEEZE TIME ;40 CYCLE(time :CYCLE)
2. Seam Welding conditions
|
Material thickness
|
Electrode diameter
|
Electrode thickness
|
Pressure:ãÂÂ
|
Current :A
|
Welding time âÂÂ1/60 sec
|
Welding speed ãÂÂ/min
|
|
Heating
|
Cooling
|
|
0.4
|
12.7R
|
9.53
|
300
|
14,500
|
2
|
2
|
1,500
|
|
0.6
|
12.7R
|
9.53
|
400
|
16,000
|
3
|
2
|
1,500
|
|
0.8
|
6.35R
|
12.7
|
450
|
21,500
|
4
|
2
|
1,500
|
|
1.2
|
6.35R
|
12.7
|
500
|
22,000
|
4
|
2
|
1,500
|
â»It is better to use intermittent current rather than continuous current.
Heat reflectivity
The heat resistance is much more excellent than galvanized steel sheet and the heat reflectivity is 2 times more excellent than galvanized steel sheet so as to be used as roofing material and walls without painting to get energy saving effects.
|
Material
|
Heat transfer
|
|
AI-coated steel sheet
|
40
|
|
Galvalume steel sheet
|
65
|
|
Galvanized steel sheet
|
120
|
|
Asbestos cement
|
150
|
Painting property
Galvanized steel sheets is painted through weathering or pre-treatment for a certain period, but the galvalume steel sheets has excellent adhesion with coating layer and paint, so ones for sign board and general use can be painted without weathering or pre-treatment.
Producible standards
|
Item
|
Range
|
|
Thickness(mm)
|
0.35~2.3
|
|
Width(mm)
|
600~1,270
|
|
Length(mm)
|
600~5,000
|
|
Unit coil weight(ton)
|
12
|
|
Coil inner diameter(mm)
|
508 / 610
|
Coating attachment quantity
|
AI·Zn alloy coating attachment quantity(g/ã¡)
|
Coating thickness (m)
|
|
100
|
26
|
|
150
|
40
|
|
200
|
52
|
Finishing
- Chromate treatment - Anti-finger printed treatment - Oil treatment
|
Click to enlarge image
Related Keywords:
Bookmark / Share this page