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Galvalume Steel Corrugated Roof Sheet

A Galvalume steel corrugated roof sheet is a high-performance building material manufactured from Galvalume-coated steel coil. The core of this product is a hot-dip coating composed of 55% aluminum, 43.4% zinc, and 1.6% silicon, which metallurgically bonds to the steel substrate. This unique alloy coating synergistically combines the barrier protection of aluminum with the sacrificial anode protection of zinc, resulting in a roofing material with exceptional durability, longevity, and aesthetics, suitable for a wide range of architectural and industrial applications, including extreme environments.

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Galvalume Steel Sheet

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Galvalume Steel Corrugated Roof Sheet Description

Key Advantages & Features
1. Superior Corrosion & Rust Resistance
The aluminum content forms a stable, self-healing oxide layer that acts as a robust barrier against moisture and atmospheric agents. Simultaneously, the zinc component provides galvanic (sacrificial) protection to cut edges and scratches. This dual-protection mechanism grants Galvalume sheets a corrosion resistance typically 2 to 6 times greater than that of standard galvanized steel (GI) under identical conditions.

2. Excellent Heat Reflectivity & Energy Efficiency
With a solar reflectance approximately twice that of traditional galvanized roofing, Galvalume sheets significantly reduce heat absorption. This helps lower indoor temperatures during summer, decreasing cooling energy consumption and improving thermal comfort—making it an ideal choice for hot climates and sustainable building designs.

3. High-Temperature Resistance
The alloy coating maintains stability and protective properties at sustained temperatures up to 315°C (600°F), allowing for reliable long-term performance in applications exposed to high heat, such as in certain industrial settings or under intense solar radiation.

4. Aesthetic Appeal & Paint Adhesion
The surface features a distinctive, uniform silvery-white spangle pattern with a smooth finish, offering an attractive appearance suitable for exposed applications. The coating also provides an excellent substrate for painting, with superior paint adhesion for customized color and aesthetic requirements.

5. Outstanding Formability & Fabrication
The base steel and coating are designed for excellent formability, allowing for easy and precise cutting, bending, roll-forming, and profiling without coating cracking or peeling. This ensures structural integrity and coating durability in complex roof designs.

Scope of Application

Commercial buildings: hospitals, schools, shops, government buildings, etc.
Residential projects: private houses, apartments, temporary houses, garages, etc.
Industrial application: warehouse, factory, etc
Agricultural use: barn, storage room, greenhouse, etc

Product Parameters

Product Name	Galvalume Steel Sheet
Thickness	0.12mm-6.00mm
Width	20mm-1500mm
Length	1m-12m, Support Customization
Standard	AISI, ASTM, DIN, JIS, GB, JIS, SUS, EN, etc.
Thickness of Aluminum Zinc Coating	15-275g/m²
Content of Al-Zn Coating	Al: 55%, Zn: 43.5%, Si: 1.5%

Chemical Composition

Al	Zn	Si	Fe	Cu	Cd	Pb	Sn	Ni	Close Cr
55-58	41-43	1.5-2	0.25	0.03	0.05	0.01	0.05	0.05	0.05

Mechanical Properties

Grade	Yield Strength MPa≥	Tensile Strength MPa≥	Elongation A%≥
DX51D Z/ZM/AZ/AM	240-380	270-500	22
DX52D Z/ZM/AZ/AM	140-300	270-420	26
DX53D Z/ZM/AZ/AM	140-260	270-380	30
DX54D Z/ZM/AZ/AM	120-220	260-350	36
S220GD Z/ZM/AM	220	300	20
S250GD Z/ZM/AZ/AM	250	330	19
S280GD Z/ZM/AM	280	360	18
S300GD A/AM	300	380	18
S320GD Z/ZM/AM	320	390	17
S350GD Z/ZM/AZ/AM	350	420	16
S450GD A/AM	450	480	15
S550GD Z/ZM/AZ/AM	550	550	-

Galvanized Surface Selection

Type of Coating	Recommended Coating Weight
Aluminum-zinc Alloy	30/40/50/60/75/90/100/150
A: Coating quality50g/㎡,approximately equal to the coating thickness13.3pm

Project	Classification	Symbol
Type of Coating	Aluminum-zinc Alloy	AZ
Surface Finish	Conventional Sequins	R
	Minimize Sequins	M
	Skin Through	S
Surface Treatment	Chromate Passivation	c
	Non-chromate Passivation	C5
	Chromate Passivationoiling	CO
	Chromium-free Passivationoiling	CO5
	Anti-fingerprint	N
	Chromate-free/Anti-fingerprint	N5
	No chromate high weather resistance fingerprint	NW
	Oil filling	0
	No treatment	U

Material Comparison

Chinese Standard	European Standards	American Standard	Japanese Standard
DC51D+AZ	DX51D+AZ	CS Type B, Type C	SGLCC
DC52D+AZ	DX52D+AZ	DS	SGLCD
S250GD+AZ	S250GD+AZ	255	-
S300GD+AZ	-	-	-
S350GD+AZ	S350GD+AZ	345	Class1 SGLC490
S550GD+AZ	S550GD+AZ	550	SGLC570

Packing and delivery

The company has become a trustworthy partner of the international steel industry. After nearly two decades of unremitting efforts, our customer base now covers more than 110 countries and regions in Europe, the Middle East, South America, and Southeast Asia.

Service Phone

+86 18115375867

sales1@yonggangmetal.com

Factory workshop

As a leading steel supply chain enterprise, Jiangsu Yonggang Supply Chain Co., Ltd. has established a solid business network in domestic and international markets, relying on its strong resource integration capabilities. The company has a complete warehousing and logistics system covering major industrial areas, ensuring efficient product circulation. Through years of dedicated work, the company has accumulated rich industry experience, serving customers worldwide, including large-scale engineering projects and manufacturing enterprises. The company emphasizes sustainable development, significantly improving operational efficiency through optimized supply chain management, and providing customers with reliable and flexible solutions.

Factory workshop

CUSTOMER VISIT

APPLICATION AREAS

The company's products are widely used in construction, machinery manufacturing, energy infrastructure, and other industries, meeting diverse domestic and international market demands. By integrating upstream and downstream resources, the company provides one-stop steel procurement and distribution services, aiming to become a core partner in the global steel supply chain.

CUSTOMER REVIEWS

Purchasing Manager

"We've been cooperating with Yonggang Steel for three years, and the product quality has always been consistently stable and reliable. Whether it's the tensile strength of the rebar or the dimensional accuracy of the profiles, they fully meet national standards, and some even surpass those of our competitors. Delivery times have never been delayed, especially for urgent orders. The sales team responds 24/7, and logistics are efficient, saving us considerable time and costs. I highly recommend them to any partner who needs high-quality steel!"

Technical Director

"We produce high-precision equipment, and we have high requirements for the material and processing performance of the steel." "Extremely high. Yonggang Steel's technical team customized steel plates with a special alloy ratio according to our needs, solving our long-standing problem of heat treatment deformation. Their professional service and rapid response make them a supplier we can trust long-term!"

Project Manager

"In the Yonggang high-speed rail project, Yonggang Steel provided full-service, one-stop service. From material selection and on-site technical guidance to after-sales testing, dedicated personnel were assigned to each step. Especially during the pandemic, they coordinated resources from multiple parties to ensure supply and maintain project progress. A company like this deserves to thrive!"

Plant Owner

"Even small-batch orders can enjoy VIP treatment! Yonggang Steel's sales team didn't treat our small orders carelessly; instead, they recommended a more material-saving cutting solution based on our processing techniques, helping us reduce material waste by 15%. Transparent pricing and flexible payment terms are incredibly friendly to SMEs!"

Export Trading Manager

"Export orders have strict requirements for material certification and packaging. Yonggang Steel's quality inspection reports are detailed and standardized, and the packaging uses rust-proof treatment and wooden pallets for reinforcement. There was no rust after three months of sea freight. Last year, we exported 3,000 tons of H-beams to Southeast Asia, and the customer had zero complaints during acceptance. This year, we've already increased our order to 8,000 tons!"

Galvalume Steel Sheet

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YONGGANG SUPPLY CHAIN

Focuses on the steel supply chain field, with its main business covering a variety of steel products, including pipes, plates, coils, bars, rebar, reinforcing bars, and profiles.

E-mail:sales1@yonggangmetal.com
WhatsApp: +86-18115375867

Tel:+86-18115375867