Brief Introduction of Hot Dip Alu-zinc Steel Plate

Hot dip aluminum-zinc steel(aluzinc steel/galvalume steel) sheet is a kind of pre coated steel plate, which is made of cold rolled steel plate of various strength, thickness and specifications as the base material and is hot-dip plated with a layer of Aluminum and zinc coating on both sides. The content percentage of the coating composition is 55% Al, 43.5% Zn and 1.5% Si, which combines the physical protection and high durability of Al as well as the electrochemical protection characteristics of Zn. In addition, hot-dip aluminum-zinc steel plate has a highly decorative bright silver gray color and regular patterns on the surface, and has a textural convex surface.
Hot dip aluminum zinc steel sheet is widely applied in industrial products such as construction, automobile and household appliances:
Construction industry: light steel keel, building floor, roof, exterior wall, garage door, rolling shutter door, fence and shutter of various civil and industrial buildings.
Household appliances: the shell and bottom plate of various household appliances, ovens, explosion-proof strips, external covers of air conditioning and ventilation systems, solar water heaters, and electrical components.
Automobile industry: shell, inner plate, bottom plate, muffler, heat shield of exhaust pipe and catalytic converter, parts at the bottom of automobile body, road sign plate.
Industrial instruments: electric control cabinet, industrial freezer, vending machine, etc.

1、Available specification range of WITOP STEEL

Type Thickness (mm) Width (mm) Length ( or Coil Inner Diameter)(mm)
Steel Plate 0.12-1.50 600-1250 1000-6000
Steel Coil 0.12-1.50 600-1250 508 or 610
Steel Strip 0.12-1.50 20-600 508 or 610

2、Standard and steel grade of WITOP STEEL

Type of Material BAOSTEEL Standard Steel Grade Notes
 Cold Forming Steel Q/BQB425 DC51D+AZ Suitable for Cold Forming
Structural Steel S250GD+AZ Suitable for Structural Steel
a:applicable to products with incomplete annealing after rolling hardening

3、Classification and code of coating type of WITOP STEEL

Type Item Abbreviation
Coating Type Aluminum zinc alloy coating AZ
Coating weight g/m2 20/20, 30/30, 40/40, 50/50, 60/60, 75/75, 90/90

green color aluzinc steel coil      golden color aluzinc steel coil

4、 Classification and code of surface treatment of WITOP STEEL

Item Type Abbreviation Notes
Surface  Treatment Chromate Passivation C This surface treatment can reduce the black rust on the product surface during transportation and storage.
Oiled O This surface treatment can reduce the black rust on the product surface, which is generally not used as rolling oil and stamping lubricating oil for post-processing.
Chromate Passivation+Oiled CO This surface treatment can further reduce the black rust on the product surface
Anti Finger Print Film AFP This surface treatment has no trace on the surface after finger touching, which can reduce the black rust on the product surface.

No-Color AFP, Golden-color AFP, Green-color AFP, Blue-color AFP.

Untreated U This surface is easy to cause black rust, so the user should consider carefully when selecting.

5、Hot-dip aluminum zinc comparison table of similar grades of WITOP STEEL

Q/BQB 425-2009 AS 1397-2001 EN 10215-1995 ASTM A792M-02 JIS G 3321:1998 ISO 9364-2001
DC51D+AZ G2+AZ DX51D+AZ CS type B、type C SGLCC 01
S250GD+AZ G250+AZ S250GD+AZ 255 250
S300GD+AZ G300+AZ
S350GD+AZ G350+AZ S350GD+AZ 345 Class1 SGLC490 350
S550GD+AZ G550+AZ S550GD+AZ 550 SGLC570 550

Qingdao Witop Steel group mainly produce cold rolled steel, galvanized steel, galvalume steel, pre-painted/color coated steel, tinplate and other steel materials.



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