Hot Dipped Galvalume Steel Coil

What is Hot Dip galvalume Aluzinc Steel coil?

Hot Dip galvalume Aluzinc Steel coil is also known as Al-Zn coated steel coil. It is a carbon steel sheet coated with aluminum-zinc alloy through a continuous hot-dip process. The typical coating composition is 55% aluminum, 43.5% zinc and 1.5% silicon.

Hot dip Galvalume Aluzinc Steel Coil is a coated steel that is used in the automotive, industrial, and building and construction industries. The coating on this type of corrugated steel provides corrosion resistance in severe environments, including marine and acid environments.

Hot Dip Galvalume Aluzinc Steel Coil


Products Standard of hot dip galvalume aluzinc steel coil

Product Specification and Size :
Hot Dip Galvalume Aluzinc Coated Steel Coil (GL)


GB T 2518JIS G 3321ASTM A792MEN10346
DX53DS250GDSGLCDD440 570TypeGradeDX53DS250GD
 S280GD  A230 S280GD
 S320GD  B255 S320GD
 S350GD  C275 S350GD
Thickness of Base Steel (mm)DX51D, S220GD, S250GD: 0.13~2.5mm;SGLCC, SGLC340: 0.13~2.52mm;CS Type A, B, C, Grade 230, 255: 0.13~2.5mm;DX51D, S220GD, S250GD: 0.13~2.5mm;
DX52D: 0.13~2.0mm;SGLCD1~3: 0.13~2.0mm;FS Type A, B: 0.13~2.0mm;DX52D: 0.13~2.0mm;
DX53D, 54D: 0.13~2.0mm;SGLC400: 0.13~2.0mm;DS: 0.13~2.0mm;DX53D, 54D: 0.13~2.0mm;
S280GD: 0.13~2.0mm;SGLC440: 0.13~2.0mm;SS Grade 275: 0.13~2.0mm;S280GD: 0.13~2.0mm;
S320GD, S350GD: 0.13~2.0mm;SGLC570: 0.13~2.0mm;SS Grade 340: 0.13~2.0mm;S320GD, S350GD: 0.13~2.0mm;
S550GD: 0.13~2.0mm; SS Grade 550: 0.13~2.0mm;S550GD: 0.13~2.0mm;
Coating MassAZ30~AZ200AZ70~AZ200AZM100~AZM210AZ100~AZ185
Regular Spangle
Surface FinishRegular Spangle
Surface TreatmentChromating, Oiled, Resin Coated (Anti-Fingerprint), or Green Treatment (Environmentally Friendly Anti-Fingerprint)
Remarks1. Tolerance for thickness, width, flatness and so on conforms to individual product specification.
2. All products with thickness 2.0mm and under can be skin passed.
3. The coil inside diameter can be either 508mm or 610mm. The maximum coil outside diameter is 2000mm.
4. Please make inquiries to our Sales & Marketing Division for products with special specifications.
5. Coating mass beyond the specifications above can be provided by Witop Steel. upon mutual agreement between customers and us.


Steel Grade of hot dip galvalume aluzinc steel coil

According to different production standards, materials are divided into required materials. Main production standards and material comparisons are as follows:


Production Standard

Steel GradeGB T 2518JIS G 3321ASTM A792MEN 10346
CommercialDX51DSGLCCCS Type B & CDX51D
Special Deep DrawingDX54D -EDDSDX54D
special deep drawing quality, (only +AS), heat resistance up to 800 °C;DX55D - -DX55D
Extra Deep DrawingDX56D - -DX56D
Super Deep DrawingDX57D - -DX57D


S250GD - -S250GD
S280GD - -S280GD
S320GDSGLC400 -S320GD
S350GDSGLC440 -S350GD
S450GDSGLC490SS 345 Class 1S450GD
S550GDSGLC570SS 550 Class 1S550GD

Surface Treatment of hot dip galvalume aluzinc steel coil

There are many surface treatment processes for galvalume Aluzinc coil, and the surface treatment requirements are different according to different uses. The following are common surface treatments,

Hot-dip coated flat products receive one of the following surface treatments at the producer’s plant :
chemical passivation:                           C
oiling:                                                         O
chemical passivation and oiling        CO
Anti Fingerprint                                        AFP

The period of protection afforded is limited and depends on the atmospheric and storage conditions.
Hot-dip coated flat products are only supplied without surface treatment (untreated (U)) if expressively desired bythe purchaser on his own responsibility. in this case, there is increased risk of formation of corrosion products onthe surface during storage and transportation.

Chemical passivation, Oiling treatment , Anti Fingerprint,  Skin-pass, Chromate, Unoiled, Dry etc.

 If you have any questions about hot dip Galvalume Aluzinc Steel Coil or need to find a supplier, Witop Steel is happy to help you.

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