/Galvanized Steel Coil Sheet
Galvanized Steel Coil Sheet2018-10-12T05:25:40+00:00

Galvanized Steel Coils

Galvanized steel Coil (GI) is produced by passing the Full Hard sheet which has undergone the acid washing process and rolling process through the zinc pot, thereby applying zinc film to the surface. It has excellent corrosion resistance, paintability, and workability due to Zinc’s characteristic. Usually galvanized steel sheet and galvanized steel coil process and specifications are basically the same.

Hot-dip galvanizing is the process of applying a protective zinc coating to steel sheet or iron sheet, to prevent rusting.

  • Excellent anti-corrosion, paintability, and processability due to the self-sacrificing characterisiticof zinc.
  • Available to select and produce the desired amount of zinc gilded and in particula enables thick zinc layers(maximum 120g/m2).
  • Classified as either zero spangle or extra smooth depending on wheteher the sheet undergoes skin pass treatment.


Product name Galvanized Steel Coil
Material CGCC, DX51D,Q195,Q235
Grade SGCC,DX51D+Z
Zinc Coating 20-120g/m2
Thickness 0.13-0.8 mm
Width 600-1250 mm
Coil ID 508/610mm
Coil weight 3-8tons
Surface Structure Mini/Big Spangle
Surface Treatment Anti-Finger printing ,Chromated, oiled/ non-oiled
Package standard export package (Detailed picture is as follows)
Hardness soft (normal), hard, full hard(G300-G550)
HS code 721049
Brand name COSASTEEL

Galvanized Steel Sheets

Cosasteel is a professional manufacturer of hot dipped galvanized steel sheet in China.  Specifications: thickness(0.14-1.0mm), width(600–1250mm).  After corrugated, it is used for producing garage door, roofing tile, work shop construction, safety fence. Galvanised steel sheet’s properties make it tough enough for most exterior projects.

According the surface for galvanized steel sheet, there are big spangle,mini spangle and zero spangle.

1) Zero spangle galvanized steel sheet 

There is no zinc spangle promoting element added to the zinc liquid. When the coating layer solidifies, no zinc spangle is formed, and the crystal grains are fine and smooth, so it is called a zero spangle galvanized steel sheet. It has excellent corrosion resistance and good coating performance. It is suitable for various uses in modern industry. It is an ideal substrate for color-coated plates. It is the leading product in foreign countries and is increasingly accepted by people in China.

2) Big spangle galvanized steel Sheet

A zinc spangle promoting element is added to the zinc liquid, so that the beautiful zinc spangleis formed when the plating layer solidifies. In the initial stage of use, the appearance performance is good, but the crystal grains are coarse, there are slight unevenness, and the coating performance is not so good, especially after a period of use, blackening will occur. It has been gradually eliminated in foreign countries and can only be used for civilian products in China. Strictly speaking, it cannot be used as a color coated substrate. Among them, zinc spangle promotes the early use of lead in the element. In recent years, in order to overcome the blackening phenomenon of lead, the method of twisting is used to form zinc spangle.

3) Mini spangel galvanized steel sheet

Mini spangle galvanized steel sheet products are not strictly defined. Generally, products with mini spangle are called mini spangle products. For example, a zinc spangle with a diameter greater than 4 mm is called a large zinc spangle, and a zinc spangle with a diameter of less than 4 mm is called a mini zinc spangle. The mini zince spangle product is the same component of a large zinc spangle product, such as a zinc liquid which also contains lead or bismuth, in order to overcome The defect of the coating performance of the large zinc spangle product is poor, and various methods are adopted to suppress the growth of the zinc flower during cooling, and finally a zinc flower having a small diameter is formed. Because it has neither a mirror-like smooth surface like a large zinc spangle nor a smooth finish like a zero spangle product, it has the best coating performance and is the most ideal substrate for color-coated plates. Because of the fact that two different products can be produced in the same pot, they have been favored by manufacturers.


Product name Galvanized Steel Sheets
Zinc Coating 20-120g/m2
Thickness 0.14-1.0mm
Width 600-1250 mm
Length custom
Thickness Tolerance +0/-0.001
Width Tolerance +/-0.06
Length Tolerance +/-0.06
Surface Structure Mini/Big Spangle
Surface Treatment Anti-Finger printing ,Chromated, oiled/ non-oiled
Finish Galvanized

Production Video

Surface Finish

Surface Structure Mini Spangle Big Spangle
Weight of zinc coating Zinc > 20g/sm Zinc > 30g/sm
Surface Finish

Galvanized Steel Coil&Sheet Production Line

The manufacturing of galvanized steel coil&sheet with good weather resistance, primarily used in construction.

Galvanized production process

Galvanized steel coils production process:

  1. Uncoiler
  2. Welder
  3. Entry Looper
  4. Pre-treatment
  5. Annealing Furnace
  6. Zinc Pot
  7. Cooling Tower
  8. Water Quench Tank
  9. Skin Pass
  10. Tension Leveler
  11. Passivation Coater
  12. Exit Looper
  13. Recoiler

Galvanized Coating Layer

  • Anti-Finger printing ,Chromated, Oiled/ non-oiled
  • Zn Plating Layer (20-120g/sm)
  • Cold Rolled Steel Sheet

Quality Control

Use bending machine, pencil hardness tester, gloss meter, meteorologic tools, row lattice unit, micrometer tools, thickness gauge to control the quality of galvanized steel coil.

Packing Detail

Packaging Details:

  1. Each bare coil to be securely tied with two bands through the eye of coil (or not) and one circumferential.
  2. the contact points of these bands on the coil edge to be protect with edge protectors.
  3. Coil then to be properly wrapped with water proof /resistant paper, it then to be properly and completely metal wrapped.
  4. Wooden and iron pallet can be used or as your requirements.
  5. And each packed coil to be properly wrapped with band, three-six such band through the eye of coil at about equal distance.

Galvanized FAQ

What is Galvanized Steel

Galvanized Sheet is carbon steel sheet coated with zinc on two sides by a continuous hot-dip process. This method tightly adheres the coating to the steel with an iron-zinc alloy bonding layer formed by a diffusion process while the heated steel strip is in contact with the molten zinc. One of the drawbacks of Galvanized is that if the Zinc coating is scratched off the steel, the Steel is left unprotected, and is subject to failure.

Galvanized Steel Coils Prices

The prices of galvanized steel coils depend on zinc thickness, steel coil thickness, packing method. If you want to buy cheap galvanized steel coils, please choose 20 grams of zinc coating/㎡, steel coil of 0.8mm thickness and simple packaging. please visit Color Coated Steel Coil Price: Factors Affecting.

Product Profile
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Aggregate Rating
5 based on 17 votes
Brand Name
Product Name
Galvanized Steel Coil Sheet
USD 685
Product Availability
Available in Stock