Az50 Galvalume Coating Structural Steel Coil

AZ50 is a North American inch-pound coating designation under ASTM A792. It does not mean 50 g/m². It means 0.50 oz/ft² of coating, measured as a triple-spot total on both sides - which is 150 g/m², written AZM150 in the SI version of the same standard (A792M) and AZ150 under EN 10346.

This is the single most common mistake in galvalume buying: writing "AZ50 = 50 g/m²" on a purchase order gets you a coating roughly one third of what you intended.

1.Coating designation conversion

Conversion factor: 1 oz/ft² = 305 g/m². Thickness figures are calculated from nominal coating mass and alloy density (3,750 kg/m³) - they are not measured values and do not constitute a specification limit. The number always refers to the total on both faces, never per side.

Coating composition: 55 % aluminium, 43.4 % zinc, 1.6 % silicon by weight. The aluminium provides long-term barrier protection; the zinc provides sacrificial protection at cut edges; the silicon stabilises the intermetallic layer and improves coating adhesion.

2.Structural grades we supply

If you order to EN 10346, write the coating as AZ150, not AZ50. If you order to ASTM A792, write AZ50. Same coating, different notation - and mixing them causes most coating disputes.

3.Which coating weight for your environment

Galvalume's weakness is the cut edge: once the exposed-steel-to-coating ratio passes a critical level, the base steel rusts. In coastal or heavily cut-edge work, specify up, not down.

4.AZ50 galvalume vs G90 galvanized

Mill data puts AZ50 (AZM150) at at least twice the corrosion protection of G90 (Z275) on flat exposed surfaces, despite carrying roughly half the coating mass - because aluminium's barrier mechanism does more work per gram than zinc's sacrificial action. On cut edges the advantage narrows. Treat comparisons as indicative; environment decides.

5.Product data

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EN 10346: European standard that specifies requirements for continuously hot-dip coated steel sheet products.
ASTM A792/A792M: American standard for steel sheet coated with a 55% aluminum-zinc alloy by the hot-dip process.
AZ: Indicates aluminum-zinc alloy coating. 50: Refers to the coating mass, i.e. 50 grams per square meter (g/m²) on both sides of the steel sheet. The typical composition of the coating is 55% aluminum, 43.4% zinc, and 1.6% silicon.
AZ50 coatings offer good corrosion resistance, especially in environments where both aluminum and zinc are protective. Alu-zinc coatings provide a smooth, shiny surface that is aesthetically pleasing.
Due to the ductility of the coating, it is suitable for various manufacturing processes such as bending, roll forming, and stamping.

AZ50 Aluzinc Galvalume Steel Coil

Construction: Used in roofing, cladding, and other structural components due to its corrosion resistance and aesthetics.
Automotive: Parts that need to be protected from environmental factors.
Appliances: Exterior panels for appliances that need to combine aesthetics with durability.
Industrial: Various components in industrial machinery and equipment.

GNEE owns three factories with more than 20 production lines. Various styles for you to choose. Accept OEM/ODM orders. Any logo printing or design is free of charge. Can provide you with the best shipping plan and cost. And ensure delivery in a short time.

We look forward to receiving your inquiries as soon as possible!

Q1. Does AZ50 mean 50 g/m²?

No. AZ50 is an inch-pound designation meaning 0.50 oz/ft² total on both sides, which equals 150 g/m² - written AZM150 under ASTM A792M and AZ150 under EN 10346. This is the most common ordering mistake in galvalume; getting it wrong buys roughly one third of the intended coating.

Q2. Is AZ50 the same as AZ150?

Yes, in coating mass - the two names come from different notation systems (oz/ft² vs g/m²). Confirm which standard your project specifies so the paperwork matches.

Q3. How thick is an AZ50 coating?

Approximately 20 µm per side, calculated from nominal coating mass and alloy density. It is not a measured value and not a specification limit.

Q4. Which structural grade should I order?

SS Grade 50 (345 MPa) and S350GD are the common structural choices for panels and purlins. Grade 80 / S550GD gives more strength but much more springback. For simple bending and profiling where strength is not specified, DX51D+AZ is the cost-effective option.

Q5. Can AZ50 be used near the coast?

It is the minimum we would accept, and only for mild exposure. For coastal or salt-laden sites, move to AZ70 / AZ210 or heavier, and pay attention to cut edges.

Q6. Is galvalume better than galvanized?

On flat exposed surfaces, yes - roughly twice the corrosion life at about half the coating mass. At cut edges, galvanized zinc protects better. Choose by where the material will actually be exposed.

Q7. What is the coating composition?

55 % aluminium, 43.4 % zinc, 1.6 % silicon by weight.

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