Galvanized steel sheet, also known as galvanized steel plate, refers to a type of steel that has been coated with a thin layer of zinc to protect it from corrosion. The galvanization process is usually done through hot-dip galvanizing, where the steel is immersed in molten zinc, or through electro-galvanizing, where zinc is applied using an electric current.
The zinc coating serves as a protective barrier that prevents moisture and oxygen from reaching the steel surface, which helps to avoid rusting and extends the lifespan of the steel. Galvanized steel is widely used in various industries, including construction, automotive, and manufacturing, for products such as roofing, siding, ducts, and steel structures.
Key advantages of galvanized steel include:
Corrosion Resistance: The zinc coating offers excellent protection against rust and corrosion, even in harsh environments.
Durability: It extends the lifespan of the steel by preventing degradation over time.
Low Maintenance: The protective layer reduces the need for frequent maintenance or replacement.
Versatility: Galvanized steel is available in various thicknesses and forms, making it suitable for different applications.
It is commonly used in outdoor and exposed environments, where resistance to weather conditions is essential.
Product Specification
SPECIFICATION PARAMETER |
Commodity | Galvanized Steel Sheet |
Grade | Q195, Q235 |
SGCC, SGCH, SGC340, SGC400, SGC440, SGC490, SGC570 |
SGHC, SGH340, SGH400, SGH440, SGH490, SGH540 |
DX51D, DX52D, DX53D, DX54D |
S220GD, S250GD, S280GD, S320GD, S350GD, S400GD, S500GD, S550GD |
Standard: | AISI, ASTM, BS, DIN, GB, JIS |
Zinc coated: | 30 g/m²-275 g/m² |
Spangle | Zero spangles (0.12-2.0 mm), 0.7-4 mm with small spangles, regular (big) spangles |
Surface treatment | Chromated, oiled and anti-fingerprint |
Thickness | 0.12-4.0mm |
Width | 600-2000mm |
Supply Ability | 10000 Tons per Month |
MOQ | 1 Ton |
Packaging | Export standard, seaworthy |
Substrate | Cold rolled, Hot rolled |
ID | 508mm or 610mm |
Certificates | SGS, BV, ISO 9001 |
Trade Term | FOB, CFR, CIF |
Payment terms | T/T, L/C at sight, West Union, D/P, D/A, Paypal |
Delivery time | 14days after confirmed order |
Loading port | Tianjin port |
Container size | 20ft GP: 5898mm(Length)x2352mm(Width)x2393mm(High) |
40ft GP: 12032mm(Length)x2352mm(Width)x2393mm(High) |
40ft HC: 12032mm(Length)x2352mm(Width)x2698mm(High) |
Galvanized Steel Sheet Gauge Chart |
Gauge | mm | Inches |
8 | 4.27 | 0.1681 |
9 | 3.89 | 0.1532 |
10 | 3.51 | 0.1382 |
11 | 3.13 | 0.1233 |
12 | 2.75 | 0.1084 |
14 | 1.99 | 0.0785 |
16 | 1.61 | 0.0635 |
18 | 1.31 | 0.0516 |
20 | 1.01 | 0.0396 |
21 | 0.93 | 0.0366 |
22 | 0.85 | 0.0336 |
23 | 0.78 | 0.0306 |
24 | 0.7 | 0.0276 |
25 | 0.63 | 0.0247 |
26 | 0.55 | 0.0217 |
27 | 0.51 | 0.0202 |
28 | 0.47 | 0.0187 |
30 | 0.4 | 0.0157 |
Chemical composition
STEEL GRADE | CHEMICAL COMPOSITION % | MECHANIC PROPERTY | C.B OF | COATING |
C | Si | Mn | S | P | T.S | Y.S | E.L | COATING |
x103 | x103 | x102 | x103 | x103 | Mpa | Mpa | % | d=0 180° | G/M² |
JIS G3302 SGCC | 12 | 30 | 41 | 31 | 21 | 480 | 300 | 13 | OK | Z60-150 |
JIS G3302 SGCH | 12 | 10 | 21 | 18 | 8 | 680 | 650 | 20 | OK | Z60-150 |
ASTM A653 CS.B | 29 | 30 | 60 | 35 | 30 | 386 | 250-380 | 20 | OK | Z60-275 |
DX51D+Z | 20 | 21 | 18 | 1.8 | 11 | 355 | 245 | 38 | OK | Z60-275 |
G550 | 12 | 6 | 73 | 5 | 17 | 715 | 654 | 8 | OK | Z60-275 |
Mechanical properties of galvanized steel
Usage | Grade | Yield strength(Mpa) | Tensile strength(Mpa) | Elongation rate % |
Punching galvanized steel | DC51D+Z | - | 270-500 | ≥20 |
DC52D+Z | 140-300 | 270-420 | ≥22 |
DC53D+Z | 140-260 | 270-380 | ≥26 |
DC54D+Z | 140-220 | 270-350 | ≥30 |
Structure galvanized steel | S220GD+Z | ≥220 | ≥300 | ≥18 |
S250GD+Z | ≥250 | ≥330 | ≥17 |
S280GD+Z | ≥280 | ≥360 | ≥16 |
S320GD+Z | ≥320 | ≥390 | ≥15 |
S350GD+Z | ≥350 | ≥420 | ≥14 |
S400GD+Z | ≥400 | ≥470 | - |
S500GD+Z | ≥500 | ≥530 | - |
S550GD+Z | ≥550 | ≥560 | - |
Hot-dip Galvanized Steel Sheet
Hot-dip galvanized sheet is made by immersing the steel sheet in a molten zinc bath at about 500 °C to attach a zinc layer to the surface. This is the continuous galvanizing process. It will form a protective zinc layer on the surface so that it has good paint adhesion and weldability. It is the most widely used and cost-effective method to prolong the service life of steel sheets.
Electro-galvanized Steel Sheet
Electro-galvanizing, also known as cold galvanizing, uses electrolysis to form a uniform and dense layer on the surface of the metal. The anti-corrosion zinc layer can protect steel parts from oxidation corrosion. Also, it can meet decorative purposes. But the zinc layer of the electro-galvanizing steel sheet is only 5-30 g/m2. So its corrosion resistance is not as good as hot-dip galvanized sheets.
Difference Between Hot-Dip and Electro-galvanized Steel Sheets
Anti-corrosion
The zinc coating thickness is one of the most important factors matters corrosion resistance. The greater the zinc layer thickness, the better the corrosion resistance. Generally, the thickness of hot-dip zinc coating is more than 30 g/m2, or even as high as 600 g/m2. While the electro-galvanized zinc layer is only 5~30 g/m2 thick. So the former steel sheet is much more corrosion resistant than the latter one. At Wanzhi Steel, the maximum zinc layer is 275 g/m2 (z275 galvanized steel sheet).
Method of Operation
The hot-dip galvanized steel sheet is galvanized in a molten zinc bath at about 500 degrees, while the electro-galvanized steel sheet is processed at room temperature by electroplating or other methods. That's why electro-galvanizing also refers to the cold galvanizing process.
Surface Smoothness & Adhesion
The surface of the electro-galvanized steel sheet looks smoother than hot-dip galvanized sheets. But its adhesion is not as good as that of the hot-dip galvanized sheet. If you want only one side galvanized, you can choose the electroplating method. However, if adopting hot-dip galvanizing, both sides are coated with a zinc layer fully.
Packaging And Transportation
We offer different modes of transport depending on the customer's destination: rail transport and ship transport, etc. The Shipping Mark shall consist of: Trade mark, Seller's name, Product name, Applicable standards, Specifications, Package No., Contract No., Heat No., Production date, Weighing method, Net weight, Gross Weight, Consignee and Protection symbols, etc.
For more information or to place an order, please contact us Email: glorrmetal@gmail.com or Whatsapp: +86 18963591776
