DX51D+AZ Galvalume Steel Coil

 

DX51D+AZ galvalume steel coil is a general-purpose hot-dip aluminum-zinc coated steel manufactured according to European standard EN 10346. It is the most common cold-rolled based galvalume material, featured with excellent formability, flat surface and moderate corrosion resistance, mainly used for stamping, bending and general indoor & outdoor decorative components.

 

• DX51D: Non-alloy deep drawing cold rolled steel substrate

DX: Designation for flat carbon steel for cold forming

51D: Normal commercial forming grade, good ductility and easy processing for bending, stamping and rolling

 

• +AZ: Hot-dip galvalume coating

AZ refers to 55% aluminum, 43.4% zinc and 1.6% silicon alloy coating;

Common coating weight: AZ50 / AZ70 / AZ100 / AZ150 / AZ180 / AZ200(g/m²)

 

 

surface treatment	description
Chromate passivation (C)	A surface treatment method used after aluminum-zinc alloy coating high-strength steel sheets to reduce white rust during transportation and storage.
Chromium-free passivation (C5)	It requires the restriction of the use of surface treatments in passivation liquids that are harmful to the environment and human body, such as hexavalent chromium.
Fingerprint resistant (N)	The surface treatment method after the passivation process acts as a lubricant during processing, preventing fingerprints from staining the surface during operation and preventing premature blackening of the surface during use.
Fingerprint-resistant without chrome (N5)	Limits the content of environmentally and human-harmful hexavalent chromium in fingerprint-resistant liquids.
Oil	Surface treatment methods that reduce corrosion during long-distance transportation and long-term storage.

 

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Mechanical properties of galvalume steel
Usage	Grade	Yield strength(MPa)	Tensile strength(MPa)
Punching galvalume steel	DC51D+Z	-	270-500
	DC52D+Z	140-300	270-420
	DC53D+Z	140-260	270-380
Structure galvalume steel	S280GD+Z	≥280	≥360
	S350GD+Z	≥350	≥420
	S550GD+Z	≥550	≥560

 

Item	Classification	Symbol
Coating type	Al-Zn alloy	AZ
Surface finish	Regular spangle	R
	Minimized spangle	M
	Skin passed	S
Surface treatment	Chromate passivated	c
	Non-chromate passivated	C5
	Chromate passivated + oiling	CO
	Non-chromate passivated+oiling	CO5
	Anti-fingerprint	N
	Non-chromate anti-fingerprint	N5
	Non-chromate high weather resistance anti-fingerprint	NW
	Oiling	0
	No treatment	U

 

1. Can Galvalume handle high temperatures?

Yes. Galvalume can withstand temperatures up to 315°C (600°F) without discoloration and even higher temperatures before the coating is compromised, making it ideal for flue pipes and appliances.

 

2. How do I maintain a Galvalume roof?

Maintenance is minimal. It is recommended to rinse the surface with clean water once a year to remove salt, dust, or organic debris that could trap moisture against the metal.

 

3. Is Galvalume more expensive than Galvanized?

Initially, Galvalume may have a slightly higher price point per ton than Galvanized steel, but its lower life-cycle cost (due to longevity) makes it more economical over time

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4. What is "Anti-Fingerprint" (AFP) Galvalume?

AFP is a thin organic coating applied over the Galvalume surface. It prevents fingerprints during installation, improves roll-forming lubrication, and adds an extra layer of protection against temporary storage stains.

 

5. Can I use Galvalume for rain gutters?

Yes, but you must ensure the entire drainage system is compatible. Avoid mixing Galvalume gutters with copper downspouts to prevent galvanic corrosion.

 

6. How is Galvalume produced?

It is produced via a continuous hot-dip process. The steel strip passes through a molten bath of the Al-Zn alloy at high speeds, ensuring a uniform and tightly bonded coating.

 

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