Galvanized Steel Sheet with Unique Advantages is Favored by Consumers

Galvanized Steel Sheet

Galvanized steel sheet, also called zinc coated steel sheet, owns many merits like strong coating adhesiveness, high erosion-resistance, accurately controlled zinc coating thickness, high size precision, flat profile and good mechanical, processing and welding performance. Therefore, the galvanized steel sheet is not best sale in the international market but favored by the customers. Category of Hot-dip galvanized products: commercial purpose, drawing, deep drawing, extra deep drawing, supreme extra deep drawing, structure, and cold forming.The products of these lines are widely used in electrical household appliance, architecture, transportation, furniture, steel silo construction, auto parts etc.

galvanized steel sheet
Galvanized Steel Sheet
Available sizes: 
  • Nominal thickness: 0.30mm~3.0mm
  • nominal width: 800mm~1830mm
  • Note: nominal thickness of a plate/strip is sum of base plate thickness and coating thickness 

Applications and features are given as following table

Steel Grade Application Feature
DC51D+Z (St01Z, St02Z, St03Z) , DC51D+ZF Commercial purpose Low carbon and/or ultra-low carbon steel
DC52D+Z (St04Z), DC52D+ZF Drawing
DC53D+Z (St05Z), DC53D+ZF Deep drawing Ultra-low carbon steel
DC54D+Z (St06Z), DC54D+ZF Extra deep drawing
DD54D+Z (St06ZR)
DC56D+Z (St07Z), DC56D+ZF Supreme extra deep drawing

Chemical Composition %:

bse metal type Grade CHEMICAL COMPOSITION %
C Si Mn P
cold rolled steel sheet DC51D+Z (St01Z, St02Z, St03Z) , DC51D+ZF ≤0.10 - ≤0.50 ≤0.035
DC52D+Z (St04Z), DC52D+ZF ≤0.08 - ≤0.45 ≤0.030
DC53D+Z (St05Z), DC53D+ZF ≤0.08 - ≤0.40 ≤0.030
DC54D+Z (St06Z), DC54D+ZF ≤0.01 ≤0.10 ≤0.30 ≤0.025
DC56D+Z (St07Z), DC56D+ZF ≤0.01 ≤0.10 ≤0.30 ≤0.025
hot rolled steel sheet DD51D+Z (St01ZR, St02ZR) ≤0.10 - ≤0.50 ≤0.035
DD54D+Z (St06ZR) ≤0.01 ≤0.10 ≤0.30 ≤0.025

Mechanical performances and coating adhesiveness
Grade Mechanical performances Coating Adhesiveness
Yield Strength MP Tensile Strength MP ≥ After Breakage Percent Elongation (LO=80mm,b=20mm)% ≥ Bending Center Diameter in Following Coating Weight (g/m2)c (a=plate thickness)
Under following nominal thickness mm ≤140/140 >140/140~175/175 >175/175
≤0.7 >0.7
DC51D+Z (St01Z, St02Z, St03Z) , DC51D+ZF - 270~500 20 22 0a 1a 2a
DC52D+Z (St04Z), DC52D+ZF 140~300 270~420 24 26
DC53D+Z (St05Z), DC53D+ZF 140~260 270~380 28 30
DC54D+Z (St06Z) 140~220 270~350 34 36
DC54D+ZF 32 34
DC56D+Z (St07Z) 120~180 270~350 38 40
DC56D+ZF 36 38

Surface structure Code No. Features Application
Conventional spangle Z Spangles condensated on zinc coating under normal conditions after galvanizing. Commercial purposes
Small spangle X Surface in spangles smaller than conventional ones and due to controlled condensation of zinc coating. Applications where conventional spangles cannot meet the surface appearance requirements.
Skin passed spangle G Surface structure after special skin pass treatment. Applications of high surface quality requirements, such as color coating base plates.
Skin passed small spangle GX
Zero spangle N No visible spangles on coating surface as a result of a special production process. -
Zn-Fe alloy R No spangle, gray, normally matte Applicable to further painting

Surface treatment
Chromate treatment (L) Chromate treatment is a chemical treatment with an aim to prevent white rusts formed on product surfaces during transportation and storage.
Oiling (Y) Oiling is to prevent white rusts formed on product surfaces during transportation and storage.
Chromate treatment+ Oiling (LY) Chromate treatment+ Oiling (LY) This treatment with oiling after surface chromate treatment is to further avoid the forming of white rusts.

Surface quality

Code No. Features
FB (O3) t is allowed for the existence of small erosion spots, dark spots, strip marks, minor chromate treatment defects and small zinc particles.
FC (O4) No erosion spot is allowed. However, it is allowed for the existence of light impression, scratches, zinc flow ripple marks, minor chromate treatment defects in small range, while the other side must reach FB requirements at least.
FD (O5) One side of relatively good quality must further restrict on defects, namely appearance quality after painting is not affected, and the other side must reach FB requirements at least.

Steel grade reference list of the standards, the cited standards and other standards

Q/BQB 420-2003 EN10142:2000 EN10147:2000 EN10292:2000 EN 10142:1990 EN 10147:1991 JISG3302-1994 ASTMA653M-2002
DC51D+Z (St01Z, St02Z, St03Z) , DC51D+ZF DC51D+Z, +ZF FeP02GZ, ZF SGCC CS type C
DC52D+Z (St04Z), DC52D+ZF DC52D+Z, +ZF FeP03GZ, ZF SGCC CS type A, type B
DC53D+Z (St05Z), DC53D+ZF DC53D+Z, +ZF FeP05GZ, ZF SGCD1 FS type A, type B
DC54D+Z (St06Z), DC54D+ZF DC54D+Z, +ZF FeP06GZ, ZF SGCD2 DDS
DC56D+Z (St07Z), DC56D+ZF DC56D+Z, +ZF DX56D+Z, +ZF (SEW 021) SGCD3 EDDS