Galvanized Steel Sheet
Thickness: 0.12-4mm
Length: 1-12m
Width: 30-1500mm
Zinc Coating: 30-275g/m2 (Z30-Z275)
Galvanized Steel Sheet
Galvanized Steel Sheet/Galvanized Carbon Steel Sheet/Thick Sheet is an important metal material with a hot-dipped galvanized surface to prevent corrosion. This steel sheet has excellent weather resistance, corrosion resistance, and durability and is widely used in construction, home appliances, automobiles, and other fields. Features such as high flatness, high strength, and easy processing make it very popular in the market. Wanzhi Steel is oriented to meet customers’ needs, support various customized solutions, and take product quality as our purpose, welcome to consult.
gi Carbon Steel Checker Plate Sheet
Spangle Galvanized Roofing Gi Sheets
Galvanized steel sheet Specification
| Item | Galvanized steel sheet (Galvanized Steel Coil Sheet) |
| Technique | Hot Rolled Cold Rolled |
| Delivery Time | 8-14 days |
| Application | making pipes, cutting sheets, making small tools, making corrugated sheets, making containers, making fences |
| Length | 1-12m |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Shape | Flat/Corrugated Steel Plate |
| Thickness | 0.12-4mm |
| Width | 30-1500mm |
| Surface | Galvanized Coated |
| Surface treatment | Passivation(C), Oiling(O), Lacquer sealing(L), Phosphating(P), Untreated(U) |
| Material | ASTM/AISI/SGCC/CGCC/TDC51DZM/TDC52DTS350GD/TS550GD/DX51D+Z Q195-q235-q345 |
Weight calculation formula
Weight (kg) = Thickness (mm) × Width (m) × Length (m) × 7.85
The density of galvanized steel sheet is usually 7.85g/cm³ (or 7850kg/m³).
Coating thickness formula
The coating thickness formula is: Dz = coating weight per square meter g (coating area mm2*zinc specific gravity).
The formula can be simplified to: Dz = 0.000139Gz.
Gz: coating weight per square meter g.
Galvanized steel sheet properties
- Excellent corrosion resistance: the zinc layer effectively isolates air and moisture, thus avoiding oxidation and rust.
- Long service life: much longer than ordinary steel sheets, 20-50 years or more in normal environments.
- Low maintenance requirement: virtually maintenance-free and therefore economical, can be used without painting.
- High strength, light weight: Inheriting the high strength characteristics of steel, galvanized treatment is lighter than traditional materials.
- Easy processing: good plasticity and processability, suitable for cutting, welding, bending, and stamping.
- Resistance to abrasion: high surface hardness, adaptable to mechanical abrasion and impact.
- Wide application: in addition to construction, it also has applications in automobile and home appliances, industry, and agriculture.
What is galvanized sheet steel?
hot rolled SGCC G90 dx51d galvanized sheet
Galvanized steel is made from ordinary steel sheets with a galvanized surface to improve its corrosion resistance and extend its service life. Continuous hot dip galvanizing is generally used so that rust rarely appears on the surface of the steel sheet over time. Galvanizing is a widely used rust prevention measure. After galvanizing, zinc grains, or “zinc spangles”, appear on the surface of the steel, the size of which can be controlled.
Grains smaller than 0.2mm are small zinc flowers, and grains 0.2mm and larger are large zinc flowers.
Three methods of galvanizing steel
According to the production and processing methods, it can be divided into the following categories:
1. Hot-dip galvanizing
Said as HDG, the steel coil passes through a high-temperature molten 99.5% pure zinc bath, usually hot-dip galvanizing continuously. In industry terminology, HDG is also called GI.
2. Alloy galvanizing
Also called galvanizing annealing, it uses the same hot-dip method as GI, reheating the coil to 500°C on an air knife to form an alloy film of zinc and iron. Because the zinc layer still contains 10% iron during the annealing process, reheating causes the iron to react with the aluminum in the zinc bath to form an iron-zinc alloy. This method is written as “GA” in industry terminology.
3. Electro galvanizing
The coating is thinner and the corrosion resistance is not as good as the hot-dip method; zinc is applied by electroplating instead of zinc dipping, zinc is used as the anode and steel is used as the cathode, and the surface effect is good. It is called “EG” in industry terminology.
Galvanized Corrugated Roof Panels
Uses of galvanized steel sheets
Construction
Use Z120-Z200, ASTM A653, JIS G3302 grades with good corrosion resistance and molding properties for roofs, structures, and walls.
Appliances
Z100-Z150, ASTM A653, JIS G3302 grade galvanized steel sheet with smooth surface, suitable for stamping and forming. Used for appliance housings and internal structures
Automotive
Z150-Z275, ASTM A792, JIS G3313 grade galvanized steel, high strength, and high corrosion resistance, suitable for automotive body and structural parts.
Industrial
Z200-Z275, ASTM A875, EN 10147, high strength and corrosion resistance, suitable for industrial equipment and structural parts.
house elevation
corrugated-metal-wall-entryway
Elevator Riser
How is Galvanized steel sheet made?
WISE STEEL galvanized sheets are produced from high quality Q195 mild steel by continuously dipping rolled coils into a molten zinc bath at 450 °C (842 °F) to obtain a galvanized steel sheet that meets the required specifications.
q195 low carbon steel coil
High Quality Galvanized Coil
4×8 HDP Galvanized-sheet
What are the common steel types for hot-dip galvanized sheets?
General commodity rolls (CQ), structural galvanized sheets (HSLA), deep drawing hot-dip galvanized sheets (DDQ), bake hardening hot-dip galvanized sheets (BH), duplex steel (DP), TRIP steel (transformation induced plasticity steel), etc.
Does galvanized steel get rusty?
It can last for decades with proper use, but it is always metal and therefore will eventually face rust. Therefore, you can choose galvanized steel with more zinc content, in the meantime, please keep it dry and hygienic, scrub it with mild detergent, and avoid direct contact with highly active metals.
What are the causes of white rust and black spots?
Black spots are formed by further oxidation of white rust. The main causes of white rust are:
- The thickness of the passivation film is not enough or uneven; passivation principle: Zn+H2GrO4-ZnGrO2=H2.
- The surface is not oiled or there is residual moisture on the steel surface.
- The surface of the strip contains moisture when it is coiled.
- The passivation is not completely dried.
- It is damp during transportation or storage.
- The finished product is stored for too long, more than three months.
Galvanized steel sheet grade chart
Galvanized steel is available in a wide variety of grades and grades, with different grades according to the base material, zinc layer, and application.
Zinc Thickness Rating Scale
| Galvanized layer grade | Weight of galvanized layer (g/m²) | Galvanized layer thickness (μm) | Applicable Scenario |
| Z100 | 100 | 7-10 | General purpose, indoor environment |
| Z120 | 120 | 10-12 | Moderately corrosive environments, such as building facades |
| Z150 | 150 | 12-15 | Highly corrosive environments, such as coastal areas |
| Z200 | 200 | 15-20 | Extremely corrosive environments, such as industrial areas or marine engineering |
| Z275 | 275 | 20-25 | Special high corrosive environments, such as chemical equipment |
Mechanical Properties Rating Scale
ASTM Standard (American Society for Testing and Materials)
| Grade | Characteristics | Uses |
| ASTM A653 | Ordinary galvanized steel sheet with good formability and weldability | Construction, home appliances, automotive parts |
| ASTM A792 | High-strength galvanized steel sheets for applications requiring high mechanical properties | Structural components, industrial equipment |
| ASTM A875 | Weather-resistant galvanized steel sheets for highly corrosive environments | Outdoor construction, bridges, guardrails |
JIS standard (Japanese Industrial Standard)
| Grade | Characteristics | Uses |
| JIS G3302 | Ordinary galvanized steel sheet with good corrosion resistance and formability | Construction, home appliances, agricultural equipment |
| JIS G3313 | High-strength galvanized steel sheet for applications requiring high strength and corrosion resistance. | Automobiles, industrial equipment, structural parts |
EN standard (European standard)
| Grade | Characteristics | Uses |
| EN 10346 | Ordinary galvanized steel sheet with good corrosion resistance and formability | Construction, home appliances, automotive parts |
| EN 10147 | High-strength galvanized steel sheets for applications requiring high mechanical properties | Structural components, industrial equipment |
Is galvanized better than stainless steel?
Z275 Galvanized Steel Sheet MS plate
Functionally speaking the performance of galvanized steel is inferior to stainless steel, especially corrosion resistance, the stainless steel family kills galvanized steel. But in price, stainless steel is relatively more expensive, it is mainly found in high-precision equipment, chloride-containing environments, such as marine equipment, biological laboratory equipment, operating rooms, etc., these places on the metal rust resistance, mechanical properties have stringent requirements, so stainless steel must be used.
In the general environment, galvanized steel is competent enough, so it has a high cost-effective, and is a good alternative to stainless steel.
Common galvanized steel grades
1. DX51D+Z (EN 10346 standard)
DX51D, equivalent to SGCC, is an ordinary galvanized steel sheet with good formability and corrosion resistance. It is used in construction, home appliances, and agricultural equipment.
2. SGC400 (JIS G3302)
This is a high-strength galvanized steel grade for applications requiring high mechanical properties, such as structural components, automotive, and industrial.
3. Q235B+Z (GB/T 2518)
China standard ordinary galvanized steel sheet with good corrosion resistance and formability. Mostly used in construction appliances and decorative fields.
4. G90 (ASTM A653)
High galvanized layer thickness grade, suitable for high corrosive environment. Concentrated in outdoor construction and industrial equipment.
ASTM Regular Spangle Hot Dipped
galvanized checker plate
Corrugated Galvanized Steel Sheet
DX 51 D-54D Mechanical properties
| Steel grade | Yield strength Re N/mm2, max. | Tensile strenght Rm N/mm2 |
| DX 51 D | – | 270 – 500 |
| DX 52 D | 140 – 300 | 270 – 420 |
| DX 53 D | 140 – 260 | 270 – 380 |
| DX 54 D | 120 – 220 | 260 – 350 |
Galvanized steel sheet composition
The chemical composition is determined by the base material (e.g. mild steel Q95, Q235, low alloy steel S355, S420) and the galvanized layer.
Chemical composition of common galvanized steel grades：
Mild steel galvanized sheet (e.g. Q235B+Z)
| Element | C | Mn | Si | P | S | Al | Zn |
| content | ≤ 0.22% | 0.30%-0.65% | ≤ 0.35% | ≤ 0.045% | ≤ 0.050% | ≥ 0.015% | ≥ 99.0% |
aluminum-zinc-steel-plate for sale
Metal-Sheet-Galvanized-Steel-Plate
Large Spangle Galvanized Steel Sheet
Low alloy steel galvanized sheet (e.g. S355J2+Z)
| Element | C | Mn | Si | P | S | Cr | Ni | Zn |
| content | ≤ 0.20% | 1.00%-1.60% | ≤ 0.55% | ≤ 0.035% | ≤ 0.035% | ≤ 0.30% | ≤ 0.50% | ≥ 99.0% |
G60 galvanized steel specification
| Item | G60 galvanized steel |
| Weight of galvanized layer on both sides | 183 g/m² (approx. 91.5 g/m² per side) |
| Weight of galvanized layer on one side | Half of both sides |
| Galvanized layer thickness | Total thickness 20-25 µm on both sides (approx. 10-12.5 µm on each side) |
| Galvanizing process | Hot-Dip Galvanizing |
| Base material | Low Carbon or Low Alloy Steel |
| Chemical Composition | C,Mn,Si,P,S,Al |
| Yield Strength (MPa) | ＞230 |
| Tensile Strength (MPa) | ＞300 |
| Elongation (%) | ＞22 |
G90 galvanized steel
The number 90 stands for the galvanizing quantity, which is 275 g/m² of zinc per square meter. The following scenarios are applicable for different zinc layer weights.
| Galvanized layer grade | Weight of galvanized layer (g/m²) | Galvanized layer thickness (μm) | Applicable Scenario |
| G30 | 90 | 10-12 | General purpose, indoor environment |
| G60 | 183 | 20-25 | Moderately corrosive environments, such as building facades |
| G90 | 275 | 30-35 | Highly corrosive environments, such as coastal areas |
Galvanized steel sheet Manufacture – Wanzhi Steel
Wanzhi Steel has several galvanized sheet coil production lines and 3 color coating lines, which can simultaneously meet the production and processing of sheet and strip coils. The length and width of our galvanized sheets can be customized.
Interested in galvanized steel? Please contact us for more, we also have sample service.
Whatsapp: +8613938459717
Email: info03@wanzhisteel.com
Inner waterproof kraft paper packaging
Cold rolled EGI galvanized sheet shipped to India
| Galvanized steel sheet thickness and theoretical weight table | |||||||
| Plate thickness (mm) | Plate weight (Kg/m2) | Plate thickness (mm) | Plate weight (Kg/m2) | Plate thickness (mm) | Plate weight (Kg/m2) | Plate thickness (mm) | Plate weight (Kg/m2) |
| 0.1 | 0.785 | 0.7 | 5.496 | 3.8 | 29.83 | 19 | 149.2 |
| 0.12 | 0.942 | 0.75 | 5.8875 | 4 | 31.4 | 20 | 157 |
| 0.15 | 1.1775 | 0.8 | 6.28 | 4.2 | 32.97 | 22 | 172.7 |
| 0.18 | 1.413 | 0.9 | 7.065 | 4.5 | 35.325 | 24 | 188.4 |
| 0.2 | 1.57 | 1 | 7.85 | 4.8 | 37.68 | 25 | 196.25 |
| 0.22 | 1.727 | 1.1 | 8.635 | 5 | 39.25 | 26 | 204.1 |
| 0.24 | 1.884 | 1.2 | 9.42 | 5.5 | 43.18 | 28 | 219.8 |
| 0.25 | 1.9625 | 1.3 | 10.21 | 6 | 47.1 | 30 | 235.5 |
| 0.28 | 2.198 | 1.4 | 10.99 | 6.5 | 51.03 | 32 | 251.2 |
| 0.3 | 2.355 | 1.5 | 11.775 | 7 | 54.96 | 34 | 266.9 |
| 0.32 | 2.512 | 1.6 | 12.56 | 8 | 62.8 | 36 | 282.6 |
| 0.35 | 2.7475 | 1.7 | 13.35 | 9 | 70.65 | 38 | 298.3 |
| 0.38 | 2.983 | 1.8 | 14.13 | 10 | 78.5 | 40 | 314 |
| 0.4 | 3.14 | 1.9 | 14.92 | 11 | 86.35 | 42 | 329.7 |
| 0.42 | 3.297 | 2 | 15.7 | 12 | 94.2 | 45 | 353.3 |
| 0.45 | 3.5325 | 2.2 | 17.27 | 13 | 102.1 | 48 | 376.8 |
| 0.48 | 3.768 | 2.5 | 19.625 | 14 | 109.9 | 50 | 392.5 |
| 0.5 | 3.925 | 2.8 | 21.98 | 15 | 117.75 | 52 | 408.2 |
| 0.55 | 4.318 | 3 | 23.55 | 16 | 125.6 | 55 | 431.8 |
| 0.6 | 4.71 | 3.2 | 25.12 | 17 | 133.5 | 58 | 455.3 |
| 0.65 | 5.103 | 3.5 | 27.475 | 18 | 141.3 | 60 | 471 |
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