Galvalume Steel Coil

The galvalume steel coil uses the cold-rolled steel sheet as a substrate and is solidified by 55% aluminum, 43.4% zinc, and 1.6% silicon at 600 °C. It combines the physical protection and high durability of aluminum and the electrochemical protection of zinc. 

COJIASTEEL strictly follows the standards of EN 10346, ASTM A792M, JIS G 3321, and AS1397 to produce galvalume steel coils. When ordering, please confirm the standard steel grade and Weight[Mass] of Coating with the supplier.

European Standards EN 10346:2015

StandardsSteel gradeThickness(mm)Width(mm)Coating Mass
(g/square meter)
EN 10346DX51D,
DX52D,
DX53D,
DX54D,
S220GD,
S250GD,
S280GD,
S320GD,
S350GD
S550GD
0.2 - 1.2800 - 1,250AZ100
AZ150
AZ185

America standards ASTM A792M

StandardsSteel gradeThickness(mm)Width(mm)Coating(g/square meter)
ASTM A792MCS(TYPE A, B, C)
FS(TYPE A, B)
DS
DDS
SS GRADE
33(230)
37(255)
40(275)
50(340) CLASS 1~3
80(550) CLASS 1~3
0.2 - 1.2800 - 1,250AZM100
AZM110
AZM120
AZM150
AZM165
AZM180

Japanese Standard JIS G 3321

StandardsSteel gradeThickness(mm)Width(mm)Coating(g/square meter)
JIS G 3321SGLCC
SGLCD
SGLCDD
SGLC400
SGLC440
SGLC490
SGLC570
0.2 - 1.2800 - 1,250Z06(60)
Z08(80)
Z10(100)
Z12(120)
Z14(140)
Z18(180)
Z20(200)
Z22(220)
Z25(250)
Z27(270)

Australian Standard AS1397

StandardsSteel gradeThickness(mm)Width(mm)Coating
AS1397G1~G3
G250
G300
G350
G450
G500
G550
0.2 - 1.2800 - 1,250AZ150
AZ200
GradeTension Test
MPa Yield strengthMPa Tensile strengthElongation % No less than
Aeomm
DX51D+AZ190~360270-50022
DX52D+AZ140-300270-42026
DX53D+AZ140-260270-38030
DX54D+AZ120~220260~35036
Grade Tension Test
Yield strength No less than Tensile strength No less thanElongation % No less than
A80mmA50mm
S250GD+AZ25033019-
S300GD+AZ30038018-
S350GD+AZ35042016-
S450GD+AZ45048015-
S550GD+AZ550550-2

Galvalume Steel Coil Manufacturer

COJIASTEEL is a Chinese galvalume steel coil manufacturer. We have the ability to supply AZ165 galvalume to meet customers’ requirements for use in highly corrosive areas. We ensure that the weight of the metallic coating does not cut corners, and we have the equipment to detect it.

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Weight of AI-Zn Coating

We mainly sell AZ50, AZ55, and AZ150 galvalume steel coils. AZ50 and AZ55 are ASTM A792 standard coating designations, meaning weights of 0.50 ounces/square foot and 0.55 ounces/square foot. AZ150 is a coating designation according to EN 10346 standard, which means the weight is 150g per square meter.

AZ50 is equivalent to AZ150;

AZ55 is equivalent to AZ165;

In addition we can also produce galvalume with lower coating weight, please contact sales.

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Feature

Galvalume steel coil has good corrosion resistance. It can balance the protective and repair effects of zinc with the anti-corrosion effect of aluminum, extending the service life of steel sheets.

Galvalume steel coil has relatively good heat resistance and will not change color when exposed to temperatures of around 316 degrees for a long time. It still has good antioxidant properties at a temperature of 677 degrees.

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Structure Chart

  • Anti-finger printing, Chromated, Oiled/non-oiled
  • Alu-Zinc Plating Layer
  • Cold Rolled Steel Sheet
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Surface Finish of Galvalume Steel

Galvalume Steel Coil 1Galvalume Steel Coil 2Galvalume Steel Coil 3Galvalume Steel Coil 4
Normal(non-skinpassed)spangleSkinpassed spangleRegular spangleMinimized spangle

Surface Treatment of Galvalume Steel Sheet

ItemClassificationSymbol
Coating typeAl-Zn alloyAZ
Surface finishRegular spangleR
Minimized spangleM
Skin passedS
Surface treatment Chromate passivatedc
Non-chromate passivatedC5
Chromate passivated + oilingCO
Non-chromate passivated+oilingCO5
Anti-fingerprintN
Non-chromate anti-fingerprintN5
Non-chromate high weather resistance anti-fingerprintNW
Oiling0
No treatmentU

Applications for Galvalume Steel Sheet

Construction: civil and industrial building roofs, facades, substrates for painted rolls, garage doors.

Industrial instruments: electric control cabinets, industrial freezers, vending machines.

Usually, building roofs are the most widely used.

 
5/5 - (27 votes)

Galvalume Steel Coil FAQ

Galvalume Steel Coil vs. Galvanized Steel Coil

The primary difference lies in its coating layer. For the galvanized sheet, a layer of zinc material is averagely distributed on the surface of galvanized sheet, playing as a positive sheet protective to the base metal, in another word, zinc works as a substitute for corrosive-proof protecting the base metal until it is torn off.

While the galvalume sheet’s surface is a coating layer consisting of 55% aluminium, 43.5% zinc and other few elements, which appears a honeycomb structure under microscopic observation. Aluminium honeycomb wraps the zinc. Under such circustances, even though the coating of galvalume also plays its protective role as a positive sheet, however, such protection decrease sharply due to declining content of zinc and no easy electrolysis when zinc wrapped by aluminium.

Therefore, once the galvalume sheet is cut open, the verge of cut would be generally losing its protector and quickly go rusting. So we should cut as less as possible, once cutting happen, use anti-rusting paint or zinc-rich paint for protecting the verge, extending its lifespan.

Galvalume Steel Coil Features

Thermal Reflection:

People use it as a material for heat insulation for its thermal reflectivity is as high as twice the galvanized steel sheet.

Heat-resistance:

The galvalume steel coil could bear above 300℃ high temperatures with its good performance in heat resistance, quite similar to the aluminized steel sheet’s performance in oxidation resistance under high temperatures. It is often used for chimney pipes, ovens, illuminators, and fluorescent lamp covers.

Corrosive-resistance performance:

The essential of galvalume steel coil’s corrosive resistance lies at aluminium’s protective property. Once the zinc comes under abrasion, the aluminium would form a layer of densified oxidized aluminium, preventing the interior from further corrosion.

Economical:

The density of 55%AL-Zn is smaller than Zn, therefore, with the same weight and thickness of coating, the galvalume steel sheet is 3% larger in area than that of the galvanized steel sheet.

Easily painted:

There is perfect adhesiveness between the galvalume sheet and paint, saving the process of pre-treatment and weathering for painting work.

The coating material on the galvalume steel sheet is outstanding in its adhesiveness, which could be directly tarring on the advertising board and commonly used board with no pre-treatment such as a weathering process.

  • The galvalume steel sheet’s surface is luxurious in silver-colored appearance.
  • Galvalume steel sheets and galvanized steel sheets are similar in performance of processability and painting.
HS Code of Galvalume Steel Coil

HS Code of Galvalume Steel Coil is 721049. Check tariffs before ordering from Japan.

Galvalume Steel Coil Price

The price of galvalume steel coil is affected by the price of raw material hot-rolled coils and the thickness, width, and AI-Zn coating weight.