What is Bluescope Zinc Aluminium Water Tank Raw Material?
BlueScope’s zinc-aluminium raw material is best known as ZINCALUME® steel, which is a proprietary coated steel developed and produced by BlueScope. It’s widely used in roofing, walling, framing, and water tanks due to its excellent corrosion resistance and durability.
Product Name: ZINCALUME® Steel
ZINCALUME® is not just zinc-coated—it’s aluminium-zinc alloy coated steel, made through a continuous hot-dip process.
Coating Composition (AZ150 standard)
| Element | % by Weight |
|---|---|
| Aluminium (Al) | 55% |
| Zinc (Zn) | 43.5% |
| Silicon (Si) | 1.5% |
No magnesium is used in traditional ZINCALUME®
Key Properties
High Corrosion Resistance
Due to the aluminum content, ZINCALUME® offers 2–4x better durability than traditional galvanized steel (G.I.).
Reflectivity
The aluminum surface reflects heat well, reducing internal building temperatures.
Formability
Suitable for roll forming and press forming.
Long Lifespan
20–30+ years lifespan depending on environment and maintenance.
Product Grades from BlueScope:
| Product Name | Base Material | Coating | Use |
|---|---|---|---|
| ZINCALUME® G300/G550 | Steel coil | AZ150 | Roofing, walling |
| TRUECORE® | High-strength steel | AZ coating + blue resin | Steel framing |
| Colorbond® | ZINCALUME® base + paint | AZ + polyester paint | Colored cladding/roofing |
Manufacturing & Standards
Brand Owner: BlueScope Steel (Australia)
Manufacturing Sites: Australia, Malaysia, Vietnam, Indonesia, etc.
Standards: Meets AS1397, ASTM A792, and local SIRIM/JIS/BS standards depending on the region.
What is China ZMA 275 Coating Grade Zinc Aluminium Water Tank Raw Material?
ZMA 275 refers to a zinc-aluminum-magnesium (Zn-Al-Mg) alloy coated steel product, where “275” denotes the coating weight of 275 grams per square meter. This advanced coating is designed to enhance corrosion resistance and durability compared to traditional galvanized or Galvalume steel.
Composition
The typical composition of ZMA 275 includes:
Zinc (Zn): The primary component providing sacrificial protection.
Aluminum (Al): Approximately 11%, enhancing corrosion resistance.
Magnesium (Mg): Around 3%, contributing to the formation of a stable and protective film.
Silicon (Si): Trace amounts to improve coating adhesion and performance .
Key Benefits:
Superior Corrosion Resistance: Offers 10–20 times better corrosion resistance than traditional galvanized steel, making it suitable for harsh environments.
Self-Healing Properties: The coating can self-repair minor damages, maintaining protection over time .
Cost-Effective: Generally 40% cheaper than stainless steel, providing a balance between performance and cost .
Environmental Compliance: Meets various international environmental standards, ensuring eco-friendly usage .
Applications:
ZMA 275 is widely used in:
Construction: Roofing, wall panels, and structural components.
Automotive Industry: Body panels and structural parts.
Agriculture: Greenhouses and storage facilities.
Renewable Energy: Solar panel frames and supports .
The Difference Between Bluescope Zinc Aluminium Water Tank and China ZMA 275
Great question — both ZMA 275 and BlueScope products (such as ZINCALUME®, TRUECORE®, and Colorbond®) fall into the category of zinc-aluminum coated steel, but there are key differences in composition, coating technology, corrosion resistance, and branding.
Coating Composition
| Feature | ZMA 275 | BlueScope ZINCALUME® |
|---|---|---|
| Main Elements | Zn-Al-Mg alloy | Zn-Al alloy |
| Typical Ratio | ~90% Zn, ~11% Al, ~3% Mg | 55% Al, 43.5% Zn, 1.5% Si |
| Magnesium Content | Present | Absent (in traditional ZINCALUME®) |
| Coating Weight | 275 g/m² total (ZMA 275) | AZ150 (150 g/m² total) |
ZMA 275 includes magnesium, which enhances self-healing and corrosion resistance, especially at cut edges and scratches.
In Summary
| Aspect | ZMA 275 | BlueScope ZINCALUME® |
|---|---|---|
| Coating | Zn-Al-Mg | Al-Zn (AZ150) |
| Corrosion Resistance | Excellent (due to Mg) | Excellent (due to Al-Zn) |
| Edge Protection | Better (Mg helps) | Good, but not as effective on cut edges |
| Brand | Generic / regional | Premium / global |
| Cost | Generally lower | Higher (premium pricing) |
If you’re choosing between them for applications like water tanks, roofing, or framing, your decision may depend on:
Budget：
For budget-conscious industrial roofing, such as factories or warehouses, ZMA 275 is a smart choice.
Environment：
ZMA 275 generally offers better edge and surface corrosion resistance in highly corrosive or marine environments, thanks to magnesium (marine/coastal needs Mg).
Certification and warranty requirements：
For government or high-end projects that require international certification or brand credibility, choose BlueScope ZINCALUME®, especially when SIRIM, AS, or ASTM compliance is needed.
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