Galvanized Steel Coils
Thickness: 0.12-6.00mm
Coil Weight: 3-8MT/Coil or as your request
Width: 600-1500mm
Zinc Coating: 30g-275g/m2
Galvanized Steel Coils
Galvanized steel coils are made from cold rolled steel sheets that are coated with a layer of zinc to prevent rust and corrosion. They are an important material for a variety of industries due to their durability, corrosion resistance, and versatility. The zinc layer can be applied through a hot dip process or electro galvanizing, and the thickness of the zinc coating is a key factor in determining the durability of the coil and its ability to resist environmental factors.
zero zinc flower galvanized coil
A1011 A36 Q235 GI Galvanized steel coil
Galvanized steel coil specifications
| Item | Galvanized steel coil(galvanized sheet metal coils) |
| Grade | SGCC/CGCC/DX51D |
| Technique | Hot Rolled / Cold Rolled |
| Delivery Time | 18-28 days |
| Processing Service | Bending, Welding, Decoiling, Cutting, Punching |
| Type of Coating | Hot Dipped Zinc coating |
| Surface Treatment | Passivation(C), Oiling(O), Lacquer sealing(L), Phosphating(P), Untreated(U) |
| Surface Structure | Zero spangles, Mini Spangle, Regular Spangle, Large Spangle |
| Standard | JIS 3302 / ASTM A653 /EN10143 AISI , ASTM , DIN , GB , JIS G3302 G3312 G3321 , BS |
| Packaging | Inner kraft paper outer metal |
| Shipping | Sea, air, land |
| Origin | Shandong, China |
| Payment method | T/T 30% prepaid |
Factory production video
Galvanized Steel Coil Weight Calculator
Weight calculation formula:
Weight (kg)=7.85×[thickness (mm)-(coating weight g/m²÷50)×7.1÷1000]+w1/1000
Quick estimation method:
Weight (kg) = (outer ring diameter²-inner coil diameter variable)/4×3.14×steel coil width mm×7.85/1000000
Note: The inner coil diameter variable is a constant related to the inner coil diameter, which can be obtained by looking up a table or empirical formula; the ring diameter unit is mm.
Galvanized Steel Coil Uses
- Buildings: Roofs, wall coverings, and structural panels.
- Automotive: Body panels, chassis, oil pipes, fuel tanks.
- Appliances: Washing machines, refrigerators and air conditioners, oven casings.
- Agriculture: Silos, grain storage boxes, irrigation systems.
house elevation
corrugated-metal-wall-entryway
Elevator Riser
Characteristics
- Corrosion resistance: The main characteristic of galvanized coil is its excellent corrosion resistance, thanks to the zinc coating that acts as a sacrificial layer.
- Durability: The long service life and high durability make it ideal for outdoor applications, and able to withstand harsh environmental conditions.
- Aesthetics: A galvanised steel coil is available in different surface treatments and color coatings, which can be specified according to the RAL color chart.
- Cost-effectiveness: Despite its superior performance, the hot dipped galvanized steel coils are affordable and low maintenance.
Wanzhi Steel Galvanized Coil/Alu-Zn Coil Production Line
Galvanized Steel Coil Price
The price depends on the zinc content, raw material cost, surface treatment, coil thickness, and width.
According to the latest data, the price ranges from $600 to $1,200 per metric ton.
Please consult our technicians for the latest prices.
Z275 Galvanized Steel Properties
Z275 is a galvanized steel coil with a zinc coating of 275 g/m² (approximately 0.90 oz/ft²) as specified by the EN 10346 standard. With the same zinc coating weight as G90, this grade has excellent corrosion resistance and is often used in harsh environments. Mechanical properties include a tensile strength of 270-500 MPa and an elongation of 22-26%.
Unit conversion formula
- The G series (G90, G185) follows the ASTM A653 standard and uses oz/ft² as the unit.
- The Z series (Z275, Z450) follows the EN 10346 standard and uses g/m² as the unit.
regular spangle hot dipped z275 gi coil
1 oz/ft² = 305 g/m²
1 g/m² = 0.00328 oz/ft²
Zinc layer weight comparison Chart
| Grade | Zinc layer weight (double side) | Zinc layer weight (single side) | Zinc layer weight (g/m²) | Zinc layer thickness (μm) | Standard |
| G30 | 0.30 oz/ft² | 0.15 oz/ft² | 91 g/m² | ~6.5 μm | ASTM A653 |
| G40 | 0.40 oz/ft² | 0.20 oz/ft² | 122 g/m² | ~8.5 μm | ASTM A653 |
| G60 | 0.60 oz/ft² | 0.30 oz/ft² | 183 g/m² | ~13 μm | ASTM A653 |
| G90 | 0.90 oz/ft² | 0.45 oz/ft² | 275 g/m² | ~20 μm | ASTM A653 |
| G115 | 1.15 oz/ft² | 0.575 oz/ft² | 351 g/m² | ~25 μm | ASTM A653 |
| G185 | 1.85 oz/ft² | 0.925 oz/ft² | 564 g/m² | ~40 μm | ASTM A653 |
| Z100 | 100 g/m² | 50 g/m² | 100 g/m² | ~7 μm | EN 10346 |
| Z140 | 140 g/m² | 70 g/m² | 140 g/m² | ~10 μm | EN 10346 |
| Z200 | 200 g/m² | 100 g/m² | 200 g/m² | ~14 μm | EN 10346 |
| Z275 | 275 g/m² | 137.5 g/m² | 275 g/m² | ~20 μm | EN 10346 |
| Z350 | 350 g/m² | 175 g/m² | 350 g/m² | ~25 μm | EN 10346 |
| Z450 | 450 g/m² | 225 g/m² | 450 g/m² | ~32 μm | EN 10346 |
Relationship between zinc layer thickness and weight
Thickness (μm) = zinc layer weight (g/m²) / 7.14 × 10
The higher the zinc layer weight, the greater the corrosion resistance, but the cost also increases accordingly.
hot dipped gi coil with regular zinc flower
zero spangle galvanized steel coil
Dx51D Z100 GI Steel coil
DX51D Z100 indicates a galvanized steel coil for cold forming with medium mechanical properties, in accordance with BS EN 10346:2015. Suitable for general use, the total weight of the zinc coating on both sides is 100 g/m². Z100 has the thinnest zinc coating, at 7 microns, and is intended for indoor use.
DX51D Meaning
- D: Indicates cold forming steel.
- X: The steel substrate is a common steel grade with “no specific requirements”.
- 51: Indicates the mechanical properties of the steel, tensile strength: 270-500 MPa, yield strength: 140-300 MPa, elongation: 22% or more.
- D: Indicates the surface quality grade of the steel, grade D is suitable for general use, and a small number of defects are allowed on the surface.
Performance Measurement of GI/GL coil
Z100 Meaning
- Z: Indicates the zinc coating (Zinc Coating).
- 100: The total weight of the zinc coating on both sides, in g/m².
- Z100: The total weight of zinc coating on both sides is 100 g/m², and the weight of zinc coating on one side is 50 g/m². 100 g/m² ≈ 0.33 oz/ft² (both sides).
Wanzhi Steel’s Continuous hot-dip galvanizing provides a wide range of protection from Z100 to Z600. We provide Dx51D Z100 Steel coil/strip/sheet/tube processing.
Zinc layer grades and application comparison Chart
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Zinc Coating Weight (g/m²) | Application scenarios |
| DX51D | 270-500 | 140-300 | Z100 (100 g/m²) | Lightweight structures, general use |
| DX52D | 270-500 | 140-300 | Z140 (140 g/m²) | Moderately corrosive environments, building structures |
| DX53D | 270-500 | 140-300 | Z275 (275 g/m²) | High corrosion resistance, outdoor use |
| DX54D | 270-500 | 140-300 | Z450 (450 g/m²) | Severely corrosive environments, marine engineering |
What is G90 Galvanized steel?
Gl and GL steel coil for sale
What does G90 mean? It is a common grade of galvanized steel coil, indicating a zinc coating weight of 0.90 oz/ft2 (275 g/m2), equivalent to Z275, a grade with excellent corrosion resistance and widespread use, with a focus on the construction and automotive sectors.
Other grades include G30, G40, G60, and Z100, each with a different zinc coating weight and corresponding level of corrosion resistance.
What is the difference between G90 galvanized and G185 galvanized?
The number after the letter G represents the total weight of the zinc layer on both sides of the steel plate, which is measured in ounces per square foot (oz/ft²).
G90 is the coating thickness specified in the A653 standard, indicating a zinc layer weight of 0.90 oz/ft², 0.45 oz/ft2 per side, and G185 means 1.85 oz/ft².
Its service life is about twice that of G90 galvanized steel.
Prepainted Galvanized Steel Coil
Brick pattern color coated roll
Wanzhi Wood Grain Series
Pre-painted galvanized steel coils are coated with a layer of paint after the galvanizing process, it’s also called PPGI coils.
This extra layer of paint provides additional protection against corrosion and enhances aesthetics.
These steel coils are used in applications where durability and appearance are critical, such as building cladding and household appliances.
Color Coated Galvanized Steel Coil
This kind of metal steel coil is based on a galvanized coil and coated with organic coating in single or double layers.
Different coatings provide different service life.
Applying coating will further extend the corrosion resistance and strength of the galvanized coil. It has bright colors.
At the same time, Wanzhi has advanced technology to provide orange peel, frosted, matte, marble, textured, wood grain, and Nano coated, custom pattern surface treatment.
Brick, marble, print, wooden grain, orange peel, matte, frosted
Cold Rolled Galvanized Steel Coil
Cold rolling is a process based on hot rolled coils. Generally speaking, the process is hot rolling → pickling → cold rolling. Cold rolling, which is formed by continuous cold deformation of hot rolling, has poor mechanical properties and too high hardness. It must be annealed to restore its mechanical properties. The coil without annealing is called a hard rolled coil.
Cold rolled strip coil
SPCC Cold Rolled galvanized Coil
Cold rolled galvanized steel coil is produced by cold rolling the steel before the galvanizing process. This can make the surface finish smoother and the thickness tolerance tighter. These steel coils are used in applications that require high precision and excellent surface finish, such as the automotive and electronics industries.
Galvanized steel coil Gauge Chart
Below is a common gauge table for galvanized steel coils, showing the thickness in millimeters and inches:
Unit conversion formula:
Thickness conversion:
1 inch = 25.4 mm, 1 mm = 0.03937 inch
Weight conversion:
lb/ft² = 4.882 kg/m², 1 kg/m² = 0.2048 lb/ft²
Relationship between Gauge and Thickness:
The smaller the Gauge value, the thicker the thickness. For example, 10 Gauge is thicker than 30 Gauge.
Gauge is a common unit of thickness in North America, while millimeter (mm) is an international unit.
| Gauge | Thickness (inches) | Thickness (mm) | Weight (lb/ft²) | Weight (kg/m²) | Common Applications |
| 30 | 0.0120 | 0.305 | 0.500 | 2.44 | Lightweight structures, interior decoration |
| 28 | 0.0149 | 0.378 | 0.625 | 3.05 | Lightweight structures, home appliance housings |
| 26 | 0.0179 | 0.455 | 0.750 | 3.66 | Building roofs, wall panels |
| 24 | 0.0239 | 0.607 | 1.000 | 4.88 | Building structures, automotive parts |
| 22 | 0.0299 | 0.759 | 1.250 | 6.10 | Building structures, industrial equipment |
| 20 | 0.0359 | 0.912 | 1.500 | 7.32 | Heavyweight structures, mechanical equipment |
| 18 | 0.0478 | 1.214 | 2.000 | 9.76 | Heavyweight structures, bridge engineering |
| 16 | 0.0598 | 1.519 | 2.500 | 12.20 | Heavyweight structures, industrial equipment |
| 14 | 0.0747 | 1.897 | 3.125 | 15.25 | Heavyweight structures, shipbuilding |
| 12 | 0.1046 | 2.657 | 4.375 | 21.35 | Ultra-heavyweight structures, special engineering |
| 10 | 0.1345 | 3.416 | 5.625 | 27.45 | Ultra-heavyweight structures, special engineering |
Galvanized steel coil Package
Kraft paper packaging first
Galvanized srip coil packaging
Galvanized steel coil manufacturers in China
The galvanized steel coil is an essential material for all industries. With broad market prospects and high profit returns, it is a worthwhile investment.
Wanzhi Steel is a golden galvanized steel coil supplier in China. The thickness, width, and coating of GI coils can be customized according to your needs.
Whether you need pre-painted, cold-rolled, hot-rolled, or color-coated galvanized steel coils, or galvalume steel coils, our experienced technical team can provide you with guiding advice and help.
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