Galvannealed Steel

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Galvannealed steel

Product Description

Galvannealed steel is a representative product of high-performance anti-corrosion coatings at the metallurgical level（It is not recommended to use galvannealed steel in its bare state）. Through a dual process of hot-dip galvanizing + precise alloying annealing, a δ1 phase (FeZn7) intermetallic compound layer with 7-15% iron content is formed on the surface of the steel base. Its unique metallurgical bonding structure and uniform dark grey appearance have achieved a breakthrough balance between anti-corrosion performance and processing performance, making it the optimal choice for applications in harsh environments such as automobiles and high-end household appliances.

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Product Details

Core process

1. Hot-dip galvanizing: Immersion in a high-purity zinc bath (Zn ≥ 99%) at 460℃, forming the initial zinc layer

2. Alloying treatment: Induction heating to 500-550℃ (±2℃ temperature control), diffusion of zinc and iron ions to form a dense Fe-Zn alloy layer

3. Surface optimization: Optional passivation (chromate/chrome-free), fingerprint resistance, lubrication treatment and other customized solutions

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
Ultimate anti-corrosion	Salt spray test > 500 hours (2-3 times than ordinary HDG)	It is suitable for highly corrosive environments such as marine climates and chemical plants, with a lifespan increase of over 30%
	The sacrificial anode protection mechanism delays the formation of red rust
Top-notch coating adhesion	The surface of the alloy layer features a fine dendritic crystal structure similar to a phosphating film, which enhances the adhesion of the coating by 50%.	Reduce the risk of coating peeling on household appliances and automotive exterior parts, and lower the cost of rework
	Passed the ASTM D3359 5B standard of the Hundred-grid test
Intelligent welding compatibility	Melting point: 530-643℃ (Pure zinc layer only 419.5℃)	Adapt to the robot welding production line to enhance the welding efficiency and yield of automotive parts
	Resistance is reduced by 15%, and welding spatter is decreased by over 40%
Super strong mechanical protection	Microhardness: 250-350 HV (about 70 HV for pure zinc coating)	Ensure the long-term reliability of electronic chassis and industrial equipment in vibrating environments
	The anti-peeling property of the δ1 phase crystal structure is enhanced by three times
High-temperature stability	Heat resistance limit: 643℃ (close to the level of aluminum alloy)	Replace aluminized plates for high-temperature components such as engine compartments to achieve cost reduction and efficiency improvement
	The cost is only 60% of that of aluminum-coated steel sheets

Material grade and application

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

Coating types and surface treatment methods

Classification	Category	Code
Coating type	galvannealed coating（zinc-iron alloy coating）	ZF
Surface structure	galvanneal（zinc-iron alloy）	R
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	0.45～2.29mm
Width	steel strip, steel coil	800～1800mm
Length	steel plate	1000～6000mm
Inside diameter	steel strip, steel coil	610 or 508mm
Coating	double-sided	80～120g/㎡
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+ZF,DC51D+ZF	0.10	0.50	0.60	0.10	0.03	0.20
DX52D+ZF,DC52D+ZF	0.10	0.50	0.60	0.10	0.03	0.20
DX53D+ZF,DC53D+ZF	0.01	0.30	0.50	0.05	0.03	0.20
DX54D+ZF,DC54D+ZF	0.01	0.30	0.30	0.03	0.02	0.20
DX56D+ZF,DC56D+ZF	0.01	0.30	0.30	0.03	0.02	0.20
DX57D+ZF,DC57D+ZF	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+ZF,DC51D+ZF	200～310	280～420	30	—	—
DX52D+ZF,DC52D+ZF	160～260	270～410	32	—	—
DX53D+ZF,DC53D+ZF	140～220	260～380	34	1.3	0.16
DX54D+ZF,DC54D+ZF	120～210	260～350	35	1.4	0.18
DX56D+ZF,DC56D+ZF	120～180	260～350	37	1.7	0.20
DX57D+ZF,DC57D+ZF	120～170	260～350	39	1.9	0.21

Typical applications

Automotive manufacturing

High-end home appliances

Construction field

Industrial equipment