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Features

Specifications

Basic Infomation

Place of Origin: Henan

Brand Name: GNEE

Certification: SGS

Payment & Shipping Terms

Packaging Details: Standard Sea Worthy Package

Supply Ability: 10000 Ton/Tons per Month

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DC51D+Az 55% Al-Zn Corrosion Resistant Galvalume Steel Coil with 20-275g/m2 Zinc Coating for Roofing and Construction

Product Description

DC51D+AZ 55% Al-Zn Steel Coil - Hot Dip Galvalume Steel Coil

The substrate composition of aluminium-zinc steel plate consists of 55% aluminum, 43.5% zinc, and 1.5% silicon. This unique combination merges the physical protection and high durability of aluminum with the electrochemical protection properties of zinc. Under identical conditions, its corrosion resistance is 4-6 times greater than standard galvanized sheet, making it an ideal material for roofing and exterior wall applications.

Performance and Applications

Excellent weather resistance enables over 20 years of service without maintenance. Early test results from roof and wall systems demonstrate survival through decades of intense sun exposure, industrial waste erosion, and extreme temperature and pressure variations without requiring maintenance. With more than 500 million square meters of construction worldwide, aluminium-zinc plate remains the preferred choice for architects and homeowners. Studies indicate such roofing systems typically last 30 years or more in most applications without requiring specialized maintenance or repair.

Product Specifications

Standard	ASTM A653, JIS G3302, GB/T3830-2006
Grade	SGCC, DX51D, A653, SGCH, Q235B
Thickness	0.12-1.3mm
Width	600-1250mm
Base Metal	Alumzinc steel coils
Zinc Coating	20-275g/m²
Coil ID	508mm/610mm
Packing	Standard seaworthy export packing: 3 layers of packaging with kraft paper inside, waterproof plastic film in the middle, and GI steel sheet covered by steel strips with lock, including inner coil sleeve
Delivery	Approximately 35 days after contract signing
Trade Term	FOB, CFR & CIF price
Payment Term	T/T or L/C
Capacity	10,000MT per month
MOQ	25MT = 20GP
Usage	Construction, automotive manufacturing, shipbuilding, containers, and household appliances

Frequently Asked Questions

What are the primary uses of Galvalume?

It is widely used for metal roofing, siding, pre-engineered metal buildings, HVAC ductwork, automotive parts, and appliances.

Is it okay to use Galvalume with pressure-treated lumber?

Generally, no. The chemicals in modern pressure-treated wood (like ACQ) are highly corrosive to Galvalume. Use a barrier tape or physical separator between the wood and metal.

Can Galvalume be used for animal shelters?

It is not recommended for interior animal confinement buildings (like pig barns) because ammonia vapors from animal waste react poorly with the coating.

What is "White Rust" and is it a defect?

White rust (Wet Storage Stain) is a white powdery deposit formed when Galvalume gets wet while tightly coiled or stacked. If light, it's usually cosmetic; if heavy, it may compromise the coating.

Does Galvalume require regular maintenance?

Very little. However, areas not washed by natural rainfall (like under eaves) should be rinsed with fresh water annually to remove accumulated salts and dust.

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Contact Person :	Ms. Kelly Zhang
Tel :	+8615824687445
Fax :	86-372-5055135

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