| After-sales Service: | Contact Supplier |
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| Warranty: | Contact Supplier |
| Standard: | ASTM, JIS, GB, AISI, DIN, BS |
| Certification: | ISO |
| Surface Treatment: | Galvanized |
| Technique: | Cold Rolled |
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| Customization: |
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Suppliers with verified business licenses
Audited Supplier | Product Name | Galvanized Steel Coil |
| Grade | SPCC, DX51D, DX52D, DX53D, DX54D, DX56D |
| Thickness | 0.12mm-3mm, or as required |
| Length | Large quantity can be customized |
| Application | Mainly used for building structure, vehicle manufacturing and other industrial structure, anti-corrosion and anti-rust properties |
| Advantage | Attracting Price; High surface quality,clean. anti-corrosion and anti-rust properties |
| Payment term | TT and LC |
Galvanized Steel Coil
Hot-Dip Galvanized Steel Coil has excellent performance, possessing ideal comprehensive properties of corrosion resistance, formation and coating. It is produced by passing the steel 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.
Galvanized Coil (GI) are mainly used in building, automobiles, metallurgy, electric equipments and more. Building - roof, door, window, roller shutter door and suspended skeleton. Automobiles - vehicle shell, chassis, door, trunk lid, oil tank, and fender. Metallurgy - steel sash blank and color coated substrate. Electric equipements - refrigerator base and shell, freezer, and kitchen equipment.
We can make steel coil as thin as 0.30mm (10μm),with a guaranteed precision thickness of ±1~3μm. Many grades for carbon steel coil stock products are available , for example,Q235,ASTM A283, SS400,S235JR,Q345,ASTM A572,S355,A36 and so on .We also can customize the thickness, width,surface finishing,hardness, and other specifications according to your needs.
Galvanized steel is a carbon steel that has been coated with zinc. The most common method of zinc coating is the hot-dip process.
The hot-dip process consists of submerging the carbon steel into a molten zinc bath (approximately 680 degrees Fahrenheit). When the material is removed from the zinc bath and cooled a reaction to the oxygen in the air occurs. The reaction causes the zinc to become part of the steel (an iron-zinc alloy bond). The new surface finish appears to have a crystalline finish or spangled finish.
Galvanized coil and sheet are produced for applications in which corrosion resistance is important. The zinc coating lengthens the life of the end product, making it desirable for manufacturers. The appealing surface finish also makes it desirable for you.
According to American Standard (ASTM A653), it can be divided into galvanized steel with normal spangles (N), minimum spangles (M), and zinc-free spangles (F). Chinese standard (GB/T 2518) is similar to ASTM. While according to the European standard (EN10346:2015), the galvanized spangle can be divided into normal spangle (N) and minimized spangle (M). Japanese standard (JIS G3302) is close to the EU standard.
| Standard | Chinese Standard (GB/T 2518) | American Standard (ASTM A653) | European Standard (EN10346:2015) | Japanese Standard (JIS G3302) |
| Steel Grade | DX51D+Z | DC51D+Z | DX51D+Z | SGCC |
| Code | N (normal spangle) | N (normal spangle) | N (normal spangle) | R (regular spangle) |
| Definition | Do not control the solidification process of the zinc layer to form various sizes of spangles during the natural solidification process. | Spangles are obtained when the zinc coating is naturally solidified. There will be spangles of different sizes and brightness. But the quality of the galvanized layer will not be affected. | Spangles formed during the crystallization and solidification of the zinc layer. | |
| Code | M (minimum spangle) | M (minimum spangle) | M (minimized spangle) | |
| Definition | Control the solidification process of the zinc layer to obtain relatively uniform and small spangles, which are still visible to the naked eye. | Fine spangles are obtained by controlling the solidification process of the zinc layer in a special way. Usually, the spangles are invisible to the naked eye. | ||
| Code | F (zinc-free spangle) | F (zinc-free spangle) | Z (zero spangles) | |
| Definition | Tiny spangles are invisible to the naked eye by controlling the solidification process of the zinc layer. | To control normal spangle formation to a small value. | ||
Big Spangles of GI Sheet
Normal Spangles on Galvanized Steel
Minimum Spangle
In fact, spangles only offer different surface appearances. But it will not influence the quality of zinc coating. However, as the base metal of prepainted galvanized steel coil, spangles will influence its painting adhesion and corrosion resistance. Therefore, small or zero-spangle products are better for the home appliance and automobile industries. While galvanized steel with normal spangle is often for general purposes and the construction industry. If you have special requirements for spangles, please inform the supplier in advance.
There are many factors that affect the size of the spangle, for example,
(1) Base metal: The thicker the base metal, the smaller the surface roughness and the larger the spangle.
(2) Cooling speed: The faster the cooling speed, the shorter the crystal growth time and the smaller the spangle.
(3) Number of nuclei: The crystal grains are formed on the steel base, the more nuclei, the smaller the spangles.
(4) Other factors (production environment, cooling temperatures, etc.)
Galvanized Sheet with spangles Regular Spangles Galvanized Steel Coil
Zhunkai Steel is a leading galvanized steel manufacturer in China, with 2 hot-dip galvanizing lines at our factory. Our extensive range of products includes high-quality galvanized steel coils, sheets, and strips with regular spangles, small spangles, and zero spangles. And HDG products are with a zinc coating range of 30-275 g/m2. At Zunkai Steel, we understand the importance of maintaining high standards, which is why we have a rigorous quality control system in place. Additionally, we welcome third-party quality inspections.
If you're looking for a reliable and experienced galvanized steel manufacturer in China, look no further than Zunkai Steel. Get in touch with us today for more details. We're always happy to help!
Zinc Coating Test:
The zinc coating layer weighing method is also named as dezincification method. According to the relevant provisions of GB/T13825, dip the sample into the deplating solution, dissolve the hot dip galvanized layer on the surface of the sample, weigh the quality of the galvanized layer before and after dissolution, and calculate the quality of the hot dip galvanized layer on the unit area of the sample according to the quality loss of the sample. This method is suitable for samples with easy surface area measurement, such as steel plates, steel pipes, and steel wires. The amount of the galvanized layer measured by this method shall be converted into the thickness of the galvanized layer in accordance with the density of the zinc coating layer (7.2 g/cm3). In the ASTM standard, the density of the zinc coating layer is 7.1 g/cm3 after conversion.
Tensile Test:
Tensile test is a test method for determining the properties of a material under axial tensile load. The data obtained from the tensile test can be used to determine the elastic limit, elongation, modulus of elasticity, proportional limit, area reduction, tensile strength, yield point, yield strength, and other tensile properties of the material. The procedure for the metal tensile test can be found in the ASTM E-8 standard. The microcomputer-controlled electronic universal testing machine is mainly used for testing various mechanical properties of various non-metal and composite materials. The professionally designed automatic control and data acquisition system realizes the full digital adjustment of the system. The collection of data, the control of the process and the post-processing of the test data during the test are all done by the computer. This equipment can automatically obtain tensile strength, peel strength, tear strength and so on.
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