Hot Dip Galvanized Material

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Hot-dip galvanized steel

Product Description

Hot-dip galvanized steel employs a metallurgical combination of molten zinc bath technology, forming a fully covering protective layer in a high-purity zinc liquid at a temperature range of 450-460℃. The coating thickness is 60-300 μm (with zinc consumption ≥ 275 g/㎡), which can completely cover the edges, weld seams and internal cavities of the steel, providing "steel armor" level protection. It is an ideal anti-corrosion solution for infrastructure in severely corrosive environments.

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Product Details

Core process

1. Pre-treatment (degreasing → oil removing → acid washing → auxiliary plating treatment)

2. Hot-dip galvanizing (zinc bath at 450-460℃ → air knife controlled thickness)

3. Post-treatment (cooling → surface treatment (passivation, oil coating) → quality inspection)

Product features

Material grade and application

Coating types and surface treatment methods

Available range

Chemical composition

Mechanical property

Product features

Features	Technical advantage	User value
All-domain anti-corrosion	Salt spray test > 300 hours	Outdoor steel structures such as bridges and transmission towers are maintenance-free for 20 to 50 years
All-domain anti-corrosion	The corner coverage rate reaches 200% of the standard ISO1461
Self-healing protection	Sacrificial anode effect for automatic scratch repair (repair radius ≥3mm)	Reduce maintenance costs during transportation and installation
Strong mechanical combination	Coating - substrate adhesion ≥3.5 N/mm² (ASTM D3359)	Anti-peeling in high-friction scenarios such as shelves and guardrails
Full life cycle economy	The cost is one fifth of that of stainless steel, and the life cycle cost is 60% lower than that of coating	The optimal cost solutions for large-scale projects such as municipal engineering and photovoltaic power stations
Green and sustainable	The zinc coating is 100% recyclable and meets the LEED certification requirements	Support the construction of green buildings and carbon-neutral projects

As a high-performance hot dip galvanized material, this product is widely supplied in the form of hot dipped galvanized steel coils (HDG), GI steel coil, and GI steel sheet, meeting the diverse needs of construction, energy, transportation, and industrial fabrication sectors. Compared with conventional surface-coated steel, hot dipped galvanized steel coils provide more uniform zinc layer distribution and superior edge protection, making them especially suitable for long-term outdoor and high-humidity applications.

As an experienced Galvanized Steel Supplier, Rosen offers stable-quality solutions manufactured in strict accordance with international standards such as ISO 1461, ASTM A123, and EN 10346. Our production partners include reliable hot dip galvanized steel coil manufacturers, ensuring consistent coating thickness, excellent adhesion, and predictable service life across different batches. Whether used as GI steel for structural frames or precision-formed GI steel sheet for panels and enclosures, Rosen’s galvanized products deliver outstanding corrosion resistance and lifecycle value.

With flexible specifications, customized zinc coating weights, and global supply capability, Rosen’s galvanized steel products are ideal for large-scale infrastructure projects, photovoltaic mounting systems, agricultural facilities, and municipal engineering—helping customers reduce maintenance costs while achieving long-term durability and sustainability goals.

Material grade and application

Grade	Material grade	Feature	Application
DX51D+Z,DC51D+Z	bending and forming grade（general commercial use）	low carbon steel	for general shaping and processing
DX52D+Z,DC52D+Z	used for drawing	low carbon steel or interstitial free steel	for drawing and shaping process
DX53D+Z,DC53D+Z	used for deep drawing	low carbon steel or interstitial free steel	for deep drawing and shaping process
DX54D+Z,DC54D+Z	used for special deep drawing	interstitial free steel	for specail deep drawing and shaping process
DX56D+Z,DC56D+Z	used for extra deep drawing		for extra deep drawing and shaping process
DX57D+Z,DC57D+Z	used for special extra-deep drawing		for particularly good deep drawing property

Coating types and surface treatment methods

Classification	Category	Code
Coating type	pure zinc coating	Z
Surface structure	zero spangle	M
Surface treatment	unprocessed	U
	chromic acid passivation	C
	oiling	O
	chromic acid passivation+oiling	CO
	chrome-free passivation	C5
	chrome-free passivation+oiling	CO5
	chrome-free inorganic passivation	IC
	chrome-free inorganic passivation+oiling	ICO
	self-lubricating	SL
	chrome-free self-lubrication	SL2
	easy workability self-lubrication	EW
	inorganic self-lubrication	SW
	inorganic solid-state lubrication	T
	chrome-free and fingerprint-resistant	N5
	chrome-free, highly conductive and fingerprint-resistant	NE

Available range

Classification	Status	Nominal dimension
Thickness	cold rolled base metal	0.45～2.5mm
Width	steel strip, steel coil	800～1850mm
Length	steel plate	1000～6000mm
Inside diameter	steel strip, steel coil	610 or 508mm
Coating	double-sided	80～275g/㎡
Delivery time	for stock	10days
Delivery time	for custom	45～60days

Chemical composition

Grade	Chemical composition (heat analysis) % (mass fraction) no more than
Grade	C	Si	Mn	P	S	Ti a
DX51D+Z,DC51D+Z	0.10	0.50	0.60	0.10	0.03	0.20
DX52D+Z,DC52D+Z	0.10	0.50	0.60	0.10	0.03	0.20
DX53D+Z,DC53D+Z	0.01	0.30	0.50	0.05	0.03	0.20
DX54D+Z,DC54D+Z	0.01	0.30	0.30	0.03	0.02	0.20
DX56D+Z,DC56D+Z	0.01	0.30	0.30	0.03	0.02	0.20
DX57D+Z,DC57D+Z	0.01	0.30	0.30	0.03	0.02	0.20

Mechanical property

Grade	Tensile test
Grade	Yield strength MPa	Tensile strength MPa	Elongation A80mm% no less than	r90 no less than	n90 no less than
DX51D+Z,DC51D+Z	—	280～420	30	—	—
DX52D+Z,DC52D+Z	160～280	270～410	32	—	—
DX53D+Z,DC53D+Z	140～220	260～380	36	1.6	0.17
DX54D+Z,DC54D+Z	120～210	260～350	38	1.8	0.18
DX56D+Z,DC56D+Z	120～180	260～350	40	2	0.21
DX57D+Z,DC57D+Z	120～170	260～350	42	2.1	0.22

Typical applications

Energy Infrastructur

Transportation engineering

Industrial facilities

Agricultural buildings

Product advantage

Ultra-Thick Zinc Coating for Extreme Environments

Using advanced hot-dip galvanizing technology, our hot dipped galvanized steel coils (HDG) feature a zinc coating thickness of 60–300 μm, forming a dense zinc-iron alloy layer. As a high-performance hot dip galvanized material, it delivers outstanding resistance to corrosion caused by salt spray, humidity, and industrial pollution. Compared with conventional GI steel, this solution is ideal for coastal regions, chemical plants, and heavy-duty infrastructure projects requiring long service life.

Full Coverage Protection on Edges and Welds

Unlike ordinary GI steel sheet that mainly protects flat surfaces, the hot-dip process ensures complete coverage on corners, edges, weld seams, and internal cavities. This makes our hot dipped galvanized steel coils highly reliable for structural fabrication, where consistent corrosion protection is critical after cutting, welding, or forming.

Strong Metallurgical Bond for Processing and Installation

The zinc coating forms a metallurgical bond with the steel substrate, providing excellent adhesion and impact resistance. This allows GI steel coil to maintain coating integrity during bending, roll forming, transportation, and installation. Products supplied by experienced hot dip galvanized steel coil manufacturers ensure stable quality and minimal risk of coating delamination in high-friction or load-bearing applications.

Cost-Efficient and Sustainable Steel Solution

As a long-lasting hot dip galvanized material, this product significantly reduces maintenance and replacement costs over its lifecycle. Compared with painted steel or stainless steel, GI steel offers an optimal balance of performance and cost, while the zinc coating is 100% recyclable. This makes GI steel sheet and coils an environmentally responsible choice for large-scale municipal, energy, and infrastructure projects.