DX51D+ZF Galvannealed Steel Coil

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DX51D+ZF Galvannealed Steel Coil

Product Description

DX51D+ZF Galvannealed Steel Coil is a continuously hot-dip coated steel product featuring a zinc-iron alloy coating. It uses DX51D steel as the substrate, which is suitable for general cold forming applications. The additional alloying heat treatment after hot-dip galvanizing forms a zinc-iron coating layer, providing a surface suitable for subsequent painting, resistance spot welding, and industrial fabrication.

With a matte gray surface and zinc-iron alloy coating, DX51D+ZF Galvannealed Steel Coil is commonly considered for automotive components, home appliance panels, electrical enclosures, and other formed metal products. Rosen supplies galvannealed steel coils with different coating specifications and dimensions to meet industrial manufacturing requirements.

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Product Features

Material Grade and Applications

Coating Types and Surface Treatment Methods

Available range

Chemical Composition

Mechanical Property

Product Features

Zinc-Iron Alloy Coating

The ZF coating is formed through hot-dip galvanizing followed by controlled alloying heat treatment. Iron diffuses into the zinc coating to create a zinc-iron alloy layer with a characteristic matte gray appearance.

Suitable for General Cold Forming

DX51D is a general cold-forming steel grade under EN 10346. It is suitable for common bending and forming operations. Actual processing performance depends on material thickness, component geometry, tooling, and forming conditions.

Good Paintability

The zinc-iron alloy surface provides favorable characteristics for subsequent painting and powder coating. Appropriate cleaning and surface pretreatment should be selected according to the final coating system.

Resistance Spot Welding Compatibility

DX51D+ZF steel is suitable for resistance spot welding applications. Welding parameters, including current, electrode pressure, and welding time, should be adjusted according to coating specifications and production conditions.

Corrosion Protection

The zinc-containing alloy coating provides sacrificial corrosion protection to the steel substrate. Coating mass, surface treatment, and additional painting systems should be considered together to meet the corrosion protection requirements of different applications.

Material Grade and Applications

DX51D+ZF consists of a DX51D steel substrate and a ZF zinc-iron alloy coating. The DX51D grade is intended for general cold-forming applications rather than demanding deep-drawing operations.

Material Specification	Description
Steel Grade	DX51D+ZF
Applicable Standard	EN 10346
Substrate Grade	DX51D
Coating Type	ZF - Zinc-Iron Alloy Coating
Forming Category	General Cold Forming
Product Form	Steel Coil

Typical Applications

Automotive Components: Formed automotive parts, brackets, covers, and components requiring subsequent painting or welding.
Home Appliances: Refrigerator panels, washing machine components, and other formed appliance parts.
Electrical Equipment: Electrical enclosures, control cabinets, and distribution box components.
Industrial Equipment: Metal housings, equipment covers, and fabricated sheet metal components.
Door Manufacturing: Formed metal panels and components used in painted door structures.

Coating Types and Surface Treatment Methods

DX51D+ZF uses a zinc-iron alloy coating designated as ZF. Different surface treatments can be selected according to storage, forming, welding, and subsequent finishing requirements.

Surface Treatment	Code	Description
Unprocessed	U	Without additional surface treatment
Chromic Acid Passivation	C	Passivation treatment for surface protection
Oiling	O	Oil application to support storage and processing
Passivation + Oiling	CO	Combined passivation and oiling treatment
Chrome-Free Passivation	C5	Passivation without chromium
Chrome-Free Passivation + Oiling	CO5	Combined chrome-free passivation and oiling
Chrome-Free Inorganic Passivation	IC	Inorganic passivation treatment without chromium
Chrome-Free Inorganic Passivation + Oiling	ICO	Combined inorganic passivation and oiling
Self-Lubricating	SL	Surface treatment with self-lubricating properties
Chrome-Free Self-Lubrication	SL2	Self-lubricating treatment without chromium
Easy-Workability Self-Lubrication	EW	Surface treatment designed to support forming operations
Inorganic Self-Lubrication	SW	Inorganic self-lubricating treatment
Inorganic Solid-State Lubrication	T	Inorganic solid-state lubrication
Chrome-Free Fingerprint-Resistant	N5	Surface treatment for fingerprint resistance
Conductive and Fingerprint-Resistant	NE	Chrome-free conductive and fingerprint-resistant treatment

Available surface treatments should be confirmed according to actual production specifications and order requirements.

Available range

Rosen supplies DX51D+ZF Galvannealed Steel Coil within the following published product range. Specific grade, coating, and dimension combinations are subject to confirmation.

Parameter	Available Range
Steel Grade	DX51D+ZF
Thickness	0.5–2.5 mm
Width	800–1800 mm
Coil Inner Diameter	508 mm / 610 mm
Coating Type	Zinc-Iron Alloy Coating (ZF)
Coating Weight	80–120 g/m² (Double-Sided)
Stock Delivery Time	Approximately 10 days
Custom Production Lead Time	Approximately 60–80 days

Chemical Composition

The following table presents the chemical composition limits published in Rosen's galvannealed steel specifications. Values are expressed as maximum mass percentages.

Grade	C (%)	Si (%)	Mn (%)	P (%)	S (%)	Ti (%)
DX51D+ZF	≤0.10	≤0.50	≤0.60	≤0.10	≤0.03	≤0.20

Mechanical Property

DX51D+ZF is designed for general cold-forming applications. The following mechanical properties are based on Rosen's published grade specifications.

Property	Specification
Yield Strength	200–310 MPa
Tensile Strength	280–420 MPa
Elongation (A80)	≥30%
Plastic Strain Ratio (r90)	Not specified
Strain Hardening Exponent (n90)	Not specified

Actual mechanical properties should be verified against the applicable product standard and the material test certificate supplied with the order.