Galvanized Steel Coil Manufacturer
  • Zinc Coating: 20-275g/m2
  • Thickness: 0.13-0.8 mm
  • Width: 600-1250 mm
  • Coil ID: 508/610mm
  • Coil weight: 3-8 tons
  • Surface Structure: Mini/Big Spangle
  • Surface Treatment: Anti-Finger printing, Chromated, oiled/ non-oiled

Hot Dipped Galvanized Steel Coil

COSASTEEL is one of the best galvanized steel coils suppliers and manufacturers in China, Our galvanized steel coil production line has an annual production capacity of 300,000 tons and a manufacturing speed of 150m/min. We can manufacture and sell galvanized steel coils with a width of 800-1250mm and a coating weight of 60-300g/m3. We manufacture galvanized steel coils according to EN 10346, ASTM A653 standard. We have sufficient galvanized steel coil stock for fast delivery.

Dx51d Z200 Galvanized Steel Coil

Dx51d z200 refers to galvanized steel coil that undergoes a continuous hot-dip galvanizing process. This method offers the steel coil broad protection from corrosion by

Dx51d Z140 Galvanized Steel Coil

Dx51d z140 refers to steel products with high formability for cold forming, as indicated in the first letter D. The letter X indicates no specific

Dx51d Z150 Galvanized Steel Coil

Dx51d Z150 galvanized steel coil is a coating and steel grade designation under the ASTM A653 / A653M requirements or specifications. The direct function of

DX51D Z100 Galvanized Steel Coil

Different types of hot-dipped galvanized steel coils are produced, one of which is DX51D Z100. Learn more about it here. What is a DX51D Z100

Z275 Galvanized Steel Coil

Learn about the Z275 galvanized steel coil in this simple but comprehensive overview. What is a Z275 galvanized steel coil? Galvanized steel coil Z275 is

Z120 Galvanized Steel Coil

All steel products for commercial, agricultural, mechanical, and industrial use are subject to ASTM standard specifications. Zinc-coated (galvanized) steel coil by the Hot-Dip Process like

Dx51d Z40 Galvanized Steel Coil

A Z40 galvanized steel coil is helpful in different applications, including manufacturing and fabrication environments. It is also durable, sustainable, and cost-effective. There are different

G90 Galvanized Steel Sheet in Coil

G90 galvanized steel sheet is a coating thickness designation specified under ASTM A653 galvanizing specification. It indicates a zinc coating of 0.90 ounces per square

G60 Galvanized Steel Sheet in Coil

ASTM A653, or the standard specification for steel sheet, zinc-coated (galvanized) or zinc-iron alloy coated (galvannealed) by the Hot-Dip Process, shows products that conform to

G40 Galvanized Steel Coil

G40 galvanized steel coil is a common zinc coating weight or designation that is directly proportional to the expected life service of the steel product. 

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Galvanized Steel Coil is used cold rolled steel coil as substrates 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. It has excellent corrosion resistance, paintability, and workability due to zinc’s characteristics.

Surface treatment of galvanized steel coil

Surface treatment typeCodeFeature
Chromic acid treatmentCGood corrosion resistance, suitable for bare state
Chromic acid treatment + oilingSGood corrosion resistance
Phosphoric acid treatment (including sealing treatment)PA certain degree of corrosion resistance, good paint performance
Phosphoric acid treatment (including sealing treatment) + oilingQIt has certain corrosion resistance, good paint performance, and prevents rust during transportation and storage
Phosphoric acid treatment (excluding sealing treatment)TA certain degree of corrosion resistance, good paint performance
Phosphoric acid treatment (excluding sealing treatment) + oilingVHave certain corrosion resistance, good paint performance, and prevent rust
OiledOPrevent rust during transportation and storage
No treatmentMSuitable for immediate painting

Chromate treatment of galvanized steel coils is also called passivation treatment. Through passivation treatment, the surface structure and gloss of the galvanized layer can be improved, the corrosion resistance and service life of the galvanized layer can be improved, and the bonding force of the coating and the base metal can be improved.

The purpose of oiling galvanized steel coils is a protective layer is formed on the surface of the steel coil to prevent the surface from rusting.

American ASTM A653 standard Galvanized Steel Sheet & Coil

  • Commercial Steel (CS Types A, B, and C)

Commercial Steel is a low-carbon cold-formed steel, such as galvanized steel roof forming

  • Forming Steel (FS Types A and B)

Requires higher drawability than Commercial Steel, such as for lamp cover forming

  • Deep Drawing Steel (DDS)
  • Extra Deep Drawing Steel (EDDS)
  • Structural Steel (SS) – (33,37,40,50,80)
  • High Strength Low Alloy Steel (HSLAS)

European EN 10346 standard galvanized steel coil

Low carbon steel for cold forming (DX51D – DX54D)

  • DX51D is equivalent to Commercial Steel, curved and profiled
  • DX52D is equivalent to Forming Steel
  • DX53D is equivalent to Deep Drawing Steel
  • DX54D is equivalent to Extra Deep Drawing Steel

Structural Steels (S220GD – S350GD)


Use structural steel for high load-bearing capacity, with a yield strength of 220-350