90-22512, Hui'an Road, Liangxi District, Wuxi City

Galvanized Steel Coil SPCC SPCD SPCE SPCG

Galvanized coil refers to a steel coil coated with a layer of zinc on the surface.Galvanizing is an economical and effective anti-corrosion method that is often used.

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Product Description

SPCC Galvanized Steel Coil

Galvanized coil refers to a steel coil coated with a layer of zinc on the surface. Galvanizing is an economical and effective anti-corrosion method that is often used. About half of the world’s zinc production is used in this process. Galvanized steel coil is to prevent corrosion on the surface of the steel coil and prolong its service life. The surface of the steel coil is coated with a layer of metallic zinc. This kind of galvanized steel coil is called galvanized coil.


Equivalent Material

GradeEuronormChina GBJapanese JISUS ASTMGerman
EN10130-2006GBT 2518-2008JIS:G3302-2005ASTM  A653MQ/SGZGS 324.3-2011
SPCCDC01DC01SPCCCS TypeCSt12
SPCDDC03DC03SPCDCS TypeA   TypeBSt13
SPCEDC03DC03SPCECS TypeA   TypeBSt14
SPCGDC06DC06SPCGEDDSSt16


Standard Specification

Thickness0.12~2.5mm
Width1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc
Length1000-6000 or Since the custom
SurfaceNormal (uneven) spangle/ Skinpassed spangle/ Regular spangle / Minimized spangles
Form coils, Foils, Rolls, Plain coil, Shim coil, Perforated coil, Chequered coil, Strip, Flats,
Blank (Circle), Ring (Flange) etc.


Metal Content

GradeCMnPS
SPCG0.20.250.020.02
SPCE0.10.450.030.03
SPCD0.120.50.040.04
SPCC0.150.60.10.05


Tensile strength :≥270  MPa

Yield strength :120~280 MPa

Elongation :28~38%


Hot-dip galvanized layer formation process

The formation process of the hot-dip galvanizing layer is the process of forming an iron-zinc alloy between the iron matrix and the outermost pure zinc layer. The iron-zinc alloy layer is formed on the surface of the workpiece during hot-dip coating, which makes the iron and pure zinc layer very close. Good combination, the process can be simply described as: when the iron workpiece is immersed in molten zinc, a solid solution of zinc and α iron (body core) is first formed on the interface. This is a crystal formed by dissolving zinc atoms in the base metal iron in a solid state. The two metal atoms are fused, and the attraction between the atoms is relatively small. Therefore, when zinc reaches saturation in the solid solution, the two element atoms of zinc and iron diffuse each other, and the zinc atoms that have diffused (or infiltrated) into the iron matrix migrate in the matrix lattice, and gradually form an alloy with iron, and diffuse The iron and zinc in the molten zinc form an intermetallic compound FeZn13, which sinks into the bottom of the hot-dip galvanizing pot, which is called zinc dross. When the workpiece is removed from the zinc immersion solution, a pure zinc layer is formed on the surface, which is a hexagonal crystal. Its iron content is not more than 0.003%.


Protection performance of hot-dip galvanized layer

The thickness of the electro-galvanized layer is usually 5-15μm, and the hot-dip galvanized layer is generally above 35μm, even as high as 200μm. Hot-dip galvanizing has good coverage, dense coating and no organic inclusions. As we all know, the anti-atmospheric corrosion mechanism of zinc includes mechanical protection and electrochemical protection. Under atmospheric corrosion conditions, there are protective films of ZnO, Zn(OH)2 and basic zinc carbonate on the surface of the zinc layer, which can slow down the corrosion of zinc to a certain extent. The protective film (also known as white rust) is damaged and a new film is formed. When the zinc layer is seriously damaged and the iron matrix is endangered, zinc will produce electrochemical protection to the matrix. The standard potential of zinc is -0.76V, and the standard potential of iron is -0.44V. When zinc and iron form a microbattery, zinc is dissolved as an anode. It is protected as a cathode. Obviously, the atmospheric corrosion resistance of hot-dip galvanizing to the base metal iron is better than that of electro-galvanizing.


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