The Differences Between Zinc-Magnesium Coated Steel (ZM275) and Zinc-Aluminum Coated Steel (AZ100 – AZ150)

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ĐỊNH NGHĨA

 

Galvalume
Hot-Dip Zinc-Aluminum Coated Steel (AZ100 - AZ200)
Hot-dip zinc-aluminum coated steel is a cold-rolled steel sheet that serves as the base material, coated with a hot-dip zinc-aluminum alloy on both sides.
The percentage composition of the coating is 55% Al, 43.5% Zn, and 1.5% Si.
ZM275
Zinc-Magnesium Coated Steel
In the hot-dip galvanizing production line, the steel strip is pre-treated.
It is immersed in a molten zinc solution containing aluminum and magnesium to achieve the coating.
The composition of the alloy coating is as follows:

Magnesium content: 1.0 ~ 2.0%
Aluminum content: 0.8 ~ 3.0%
Alternatively:
Magnesium content: 3%
Aluminum content: 11%

Product Features

 

Galvalume
Aluminum-Zinc Coated Steel AZ100 - AZ200
Hot-dipped with a protective AlZn layer of 55% on the steel surface, weighing 100-200g/m². The corrosion resistance is primarily due to the protective functions of aluminum and zinc.
When zinc wears away, aluminum forms a dense aluminum oxide layer, preventing corrosive substances from continuing to corrode the underlying steel. This enhances the protection of the steel frame against environmental and natural impacts..
ZM275
MAGNESIUM-ZINC COATED STEEL
With a main composition of 3% Mg and 11% Al-Zn, it offers strong chloride resistance (against salt, sweat, sea breeze, and soil) and alkaline corrosion resistance. Additionally, it features a self-repairing function (self-sealing cuts during the manufacturing process), making it suitable for construction projects on the sea and islands, providing optimal protection for the durability of steel frames and components for over 30 years

CHARACTERISTICS OF ZM275

– Al, Mg, Si, and other alloying elements added to the zinc-coated hot-dipped aluminum-magnesium steel (ZM275) significantly enhance the corrosion inhibition effectiveness of the coating. Compared to conventional galvanized products, this coating has lower adhesion but can achieve corrosion resistance that is 10-20 times greater than hot-dipped galvanized steel.

– The coating components around the continuous cut surface dissolve to form a dense protective film primarily composed of zinc hydroxide, zinc chloride, and magnesium hydroxide. This protective film has low electrical conductivity and effectively inhibits corrosion at the cut edges.

– Due to its ultra-high corrosion resistance, which is 10-20 times greater than that of conventional hot-dipped galvanized sheets, and its self-repairing effect against corrosion at cut edges, the lifespan of structures, components, and frames using ZM275 can be very long, averaging over 30 years.

Currently, Phu Nguyen Steel is the largest and most reputable company producing and supplying G550 lightweight steel frame houses in both AZ100 – AZ150 and ZM275 variants. With over 20 years of experience in steel structure fabrication and industrial construction, our factory covers more than 20,000 m², along with a nationwide network of distributors and partners from north to south, distributing and constructing G550 lightweight steel frame prefabricated houses across the country.

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