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3mm Galvanised Steel Sheet
3mm Galvanised Steel Sheet
3mm Galvanised Steel Sheet is a zinc-coated carbon steel sheet with a thickness of 3 millimeters. It provides excellent weather resistance and mechanical strength. Compared to regular steel sheets, it offers effective rust protection without extra coatings, making it a cost-effective choice. This product is suitable for exterior wall cladding, roofing, agricultural equipment, and machinery enclosures.
ZHAOJIAN offers various standard sizes (such as 1000×2000mm and 1250×2500mm) and supports custom dimensions upon request.
ZHAOJIAN offers various standard sizes (such as 1000×2000mm and 1250×2500mm) and supports custom dimensions upon request.
Product Specifications
| Dimension Name | Value |
| Thickness | 3.0 mm (range 0.55–6.0 mm; custom up to ≈ 25 mm) |
| Width | 600–1500 mm standard; customizable up to 3000 mm |
| Length | Sheets up to 12 m; coils any length; plate from coil up to 2″ (≈ 50 mm) |
| Material Grade | DX51D+Z (cold-rolled galvanised), SGCC; SS400 (JIS G3101), ASTM A36 equivalents |
| Chemical Composition (ASTM A36/A1011) | C ≤ 0.26 %; Mn ≤ 0.40 %; P ≤ 0.040 %; S ≤ 0.050 % |
| Chemical Composition (JIS G3101 SS400) | C ≤ 0.17 % (≤ 16 mm); Mn ≤ 1.60 %; P ≤ 0.050 %; S ≤ 0.050 % |
| Yield Strength | ASTM A36: ≥ 250 MPa; JIS SS400: ≥ 245 MPa |
| Tensile Strength | 400–550 MPa (ASTM); 400–510 MPa (JIS) |
| Elongation | ≥ 23 % (ASTM); ≥ 21 % (JIS, for ≤ 40 mm) |
| Surface Treatment | Hot-dip galvanised, chromated or oiled finish; spangle options: regular, minimal, zero, large. |
| Zinc Coating Weight | Typically 30–275 g/m² per side (e.g. Z30–Z275) |
| Formability & Weldability | Excellent formability; good weldability (MIG, TIG, SMAW) |
| Spangle Types | Regular, minimal, zero, large—chosen per aesthetic/functional need. |
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More Details
- Key Advantages
- Typical Applications
- Special Manufacturing Notes
- How strong is a 3mm steel sheet?
- What gauge is a 3mm steel sheet?
Key Advantages
High structural rigidity: With minimal flex, it’s ideal for support frames, platforms, and equipment bases
Excellent weldability: Thick enough for robust welded joints in industrial and construction projects
Weatherproof without painting: The galvanised coating eliminates the need for additional surface treatment.
Improved acoustic and thermal resistance: Thicker metal reduces vibration, sound transmission, and heat conduction compared to thinner sheets
Typical Applications
Due to its strength and durability, 3mm galvanised steel sheets are commonly used in:
- Building exteriors and façades
- Roof support structures and floor decking
- Agricultural machinery and trailers
- Industrial machine guards and housings
- Heavy-duty storage racks and workbenches
- Public infrastructure such as fencing, road signage, and utility boxes
Special Manufacturing Notes
Unlike lighter sheets, 3mm galvanised steel requires specialised handling during production.
- High-tension levelling systems to maintain flatness over large dimensions
- Thick-coating continuous galvanising lines with advanced adhesion control to ensure the zinc layer bonds completely despite the steel’s mass
- Precision guillotine shearing and deburring equipment for clean edges, ensuring safety during transport and installation
- Optional laser-guided cutting for customised industrial applications where tight tolerances are required
How strong is a 3mm steel sheet?
A 3mm galvanized steel sheet is significantly stronger than common lighter gauges, such as 1–2mm. It provides excellent resistance to bending, denting, and deformation under pressure. Depending on the steel grade, its tensile strength generally ranges from 300 to 450 MPa, making it suitable for structural and mechanical load-bearing applications. It is often used in situations where both corrosion resistance and physical durability are critical.
What gauge is a 3mm steel sheet?
In standard steel gauge terms, a 3mm steel sheet is roughly equivalent to 11 gauge. However, gauges are not always precise matches, especially when comparing different standards (US, UK, or metric). In metric systems, “3mm” is a straightforward and preferred measurement, particularly in construction and engineering settings.
