Hot-dip Galvanized Steel Sheet(GI)
Product Details
- Solderability
Hot-dip galvanized steel sheets can be easily soldered as with an appropriate solvent is used instead of surface preparations. The soldability of chromated material is excellent. Non-corrosive
solvents or mixture solutions of zinc chloride(15 to 20%) and ammonium chloride(3.3 to 5%) are typically recommended ones and through rinsing is necessary without further drying up.
- Fusion-ARC Welding
In case of arc welding with coated electrodes, it is recommended to use electrodes with good melt flow characteristics and ones coated with high ph material. Recommended electrodes are
E4303(limetitania type), E4313(high titanium oxide type), and E4316(low hydrogen type)prescribed in the KSD 7004
- Suggestions for The Improvement of Weldability Spot Welding
- Distribution of Electric Current between Upper Part And Lower Part of Electrode
- Characteristics
Since electrical conductivity of the zinc-coated layer is better than that of iron, electrical resistance is somewhat less at the contact surface between zinc layers and iron base sheet so that
heat generation is more or less lower. Melting point of zinc is lower than that of iron. So, continuous weldability is somewhat lowered due to the fact that molten zinc tends to adhere onto the
electrode. Zinc is more ductile than iron. So, electrical density of zinc coating is somewhat lowered due to relatively wider contact area by the applied pressure of electrodes.
Weldability
4
6
8
10
16
LIFE (Year)
INDUSTRIAL AREA
URBAN AREA
OUTSKIRTS
SEA SHORE
RURAL AREA
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ENVIRONMENT
The life of hot-dip zinc coating steel sheets in urban area or in industrial area is almost 25 to 40% of the life, when it in the rural area. In addition, the life of the sheets when used indoors is 5 to 10 times longer than that when used outdoors. The corrosion resistance of zinc depends on the property of the anti-corrosive thin layer thereon. The corrosion resistance of thin layer, however, deteriorates rapidly with the appearance of porous layer in case there exist corrosive components such as surfurous acid gas in the air. Accordingly, the thickness of the hot-dip zinc coating is a critical factor for the service life of the sheets. In the case of identical coating thickness it mainly relies on the environment under which the sheets are used. - General Characteristics Corrosion Resistance Hot-dip galvanized steel sheet is frequently used to be paintd as shown in the applications. Corrosion resistance after painting is much influenced by the type of steel sheet as well as pretreatments with the type of paints.
Hot-dip galvanized steel sheet manufactured through continuous galvanizing process is excellent in its property of coating adherence, and it shows little peeling of coating layer when subjected to deep drawing process since little iron-zinc alloy layer is retained.Hot-dip galvanized products can be manufactured to the various grades of formability by adoption of 172 meter-long annealing furnace. In case of deep drawing quality, good formability can be obtained similar to the corresponding grade of cold rolled steel sheets. Formability |
Hot-dip galvanized steel sheet manufactured through continuous galvanizing process is excellent in its property...
- Place of Origin:Seoul South Korea
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Who We Are We serve One Stop for All your Steel coils/Sheet needs! In Steel construction materials,we mainly deal in Flat products like HR / CR / Galvanized / Alu-Zinc / PPGI and Steel Tube. We serve the Roofing,Fabrication industries across markets in Asia,Africa and the ...
