|Product ||Hot dipped galvanized steelcoil|
|Standard ||JIS3302, EN 10142, ASTM A653, SGCC/SGCH,European Standard, ASTM A792, |
|Base plate ||Cold rolled steel Coil|
Hot dipped galvanized steel coil(small, regular or zero spangle)
Hot dipped galvalume steel coil
|Equipment ||SPCC GALVANIZED STEEL COIL/SHEET Double coating double baking; three coating three painting|
|Zinc Coating ||40g-100g/m2|
|Paint Thickness ||Top:15µm-25µm, Back: 5-8µm|
|Coil Weight || 2.5Mt-8Mt|
|Coil ID ||φ508mm-φ610mm|
|Surface paint ||EP, PE, HDP, SMP, PVDF|
|Color series || RAL color number |
Product Description of Galvanized Steel Sheet
1)Aluminum and zinc galvanized steel is the best combination of
components and structure of the alloy coated steel.
2)Alloying elements aluminum, zinc and silicon-containing coating.
3)It combines aluminum corrosion resistance, heat resistance and
zinc electrochemical (sacrificial anode) Performance
Product Feature of Galvanized Steel Sheet
Good corrosion resistance
1)Under various environmental conditions, Galvalume exhibit excellent corrosion resistance
than galvanized steel sheet of the same thickness,and its service life is 2-6 times
that of ordinary galvanized steel.Galvanized parts due to the deformation of
micro-cracks less than galvanizing, thus forming region is much higher than the
corrosion resistance hot dip galvanized.
2)There are examples of the use of the roof for 20 years in North America.
3)It sort of life: rural industrial atmosphere --- --- --- general atmosphere of severe marine
Good thermal properties
(1) Heat resistance: general galvanized products typically use temperature does not exceed 230 ºC,
reached 250 ºC when will change, but long-term use galvanized plate at 315 ºC environment.
(2) heat-reflective good: its reflection coefficient is hot galvanized plate twice in the summer can
reduce the indoor temperature, reducing air conditioning electricity consumption.
Aluminum (300G / M2): 40H / WATT / M2
Galvalume (150G / M2): 65H / WATT / M2
Galvanized (275G / M2): 120H / WATT / M2
Asbestos / cement: 150H / WATT / M2
Good surface properties
Small and uniform spangle
1.Color is bright silver
2.High surface hardness (scratch is not easy to rub)
3.A plurality of colors may be applied a semipermeable membrane
Galvalume when used as a tablet or other purposes by spray coating, degreasing simply without
the need for pre-treatment or etching treatment, because of its coating and the coating has a
good combination of polarity, and hot-dip galvanizing layerIt is not.
Relatively light weight
Because of galvanized steel plating lighter, in the case of the same coating thickness is greater
than the developed area per ton of galvanized steel, with 0.48MM, plating 40μm (both sides),
for example, its weight and tons of steel per square expand area as follows:
Weight per square meter per ton of steel to expand the area
Substrate thickness AZ150 Z275 AZ150 Z275
0.48mm 3.94kg 4.06kg 254m2 246m2
Corrosion mechanism of Galvanized Steel Sheet
(1) physical effects
Aluminum zinc coating on the surface of steel sheet, steel plate in contact with the outside blocking
the corrosive medium, the steel sheet eliminating the corrosive effects of corrosive media.
(2) chemical action
Corrosion beginning, zinc portion preferential dissolution (~ -1.05V), followed by aluminum-rich partially
dissolved (-0.9V), between last metal compound is dissolved (-0.75V), are lower than the electrode
potential of iron (-0.44V) Therefore aluminum zinc layer protects the substrate etching priority, called a
sacrificial anode protection.
(3) trivalent aluminum ion doped role
Rp (Al-Zn) = 10.5kΩ * cm2
Rp (Zn) = 3.1kΩ * cm2
Thus slowing the corrosion reaction speed