DX55D AS Hot Dip Galvanized Steel Coil

 

 

The DX55D Hot Dip Galvanized Steel Coil is exclusively available with +AS (Aluminum-Silicon Alloy) coating, a premium finish designed to address high-temperature and corrosive environments. Unlike conventional zinc coatings, the +AS coating (composed of 90% aluminum and 10% silicon) forms a stable, impermeable alumina layer when exposed to oxygen, delivering superior corrosion resistance and oxidation protection.

 

• Key Benefits of DX55D +AS Coating:

High-Temperature Resistance: Withstands temperatures up to 800°C without scaling or delamination, making it ideal for thermally stressed components like exhaust systems.

Superior Corrosion Protection: Outperforms standard zinc coatings in salt spray tests and harsh environments (hydrocarbon, outdoor), with self-renewing passivation protection if scratched.

Excellent Reflectivity: Reflects 80% of radiation from heat sources (200-600°C), suitable for thermal insulation applications such as heat shields and industrial ovens.

Formability Compatibility: The hard ternary alloy layer (4-7 microns) at the steel-coating interface ensures compatibility with complex deep-drawing processes, supported by optional prelube oils or thin organic films for enhanced processability.

 

 

DX55D hot dip galvanized steel coil adheres to international standards, with well-recognized equivalent grades across major regions. Below is the complete list of equivalent grades for easy specification matching (data accurate and compliant with global standards):

 

Standard	Equivalent Grade	Material Number	Remarks
DIN EN 10346	DX55D +AS	1.0962 (formerly 1.0309)	Original standard, special deep-drawing grade
VDA 239-100	DX55D +AS	1.0962	Comparative grade, minor deviations possible
ASTM A653/A653M	CS Type B (with +AS coating)	-	Compliant with cold forming requirements
JIS G 3302	SGCH +AS	-	Matching deep-drawing and corrosion resistance
GB/T 2518	DC55D+AS	-	Chinese standard equivalent

 

 

DX55D hot dip galvanized steel coil is a low-carbon cold-forming steel with optimized mechanical properties for deep drawing and high-temperature applications. Below are the standard properties (transverse direction, compliant with DIN EN 10346):

 

• Mechanical Properties

Property	Value	Unit	Remarks
Yield Strength (Rp0.2/ReL)	140 - 240	MPa	0.2% proof stress if no yield strength is defined
Tensile Strength (Rm)	270 - 370	MPa	Consistent across all thicknesses
Elongation at Fracture (A80)	≥30	%	Reduced by 2-7 units for thickness <0.70mm
Hardness	Soft (<60), Medium (60-85), Full Hard (85-95)	HRB	Customizable based on application

 

• Chemical Composition (Heat Analysis, Max % by Weight)

Element	C	Si	Mn	P	S	Ti
Content (%)	0.12	0.50	0.60	0.10	0.045	0.30

 

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Inner Layer: Kraft paper + waterproof plastic film to prevent moisture and corrosion during storage and transportation.

Middle Layer: Anti-scratch film to protect the +AS coating and surface finish from damage.

Outer Layer: Galvanized steel sheet wrapping + lockable steel strips for reinforcement, ensuring stability during transit.

Additional Options: Inner coil sleeve, wooden pallets, or custom packaging as per client requirements (e.g., for small batches or special surface grades).

Coil Specifications: Coil weight 3-8 tons, inner diameter 508mm/610mm (customizable), width 600-2000mm, thickness 0.2-4.0mm.

 

 

 

 

Thanks to its exceptional formability, high-temperature resistance, and corrosion protection, DX55D hot dip galvanized steel coil is widely used in multiple industries, including:

 

Automotive Industry: Heavily deep-drawn car body components, exhaust systems (upstream of front silencer), fuel filters, fuel tanks, and interior/exterior trim – leveraging its heat resistance and formability.

Household Appliances: Ovens, deep fryers, toasters, barbecues, and refrigerator/dishwasher components – benefiting from its high-temperature resistance and corrosion protection.

Industrial Equipment: Thermal shields, heating equipment, boilers, ducts, fume exhaust pipes, heat exchangers, and industrial ovens – utilizing its reflectivity and heat resistance.

Construction Industry: Fire doors, roof panels, and decorative components – offering durability and corrosion resistance in outdoor environments.

 

 

 

 

 

1. What is the difference between DX55D +AS and standard DX55D galvanized steel coil?

DX55D is exclusively available with +AS (Aluminum-Silicon Alloy) coating – there is no "standard DX55D" without +AS. The +AS coating provides superior high-temperature resistance (up to 800°C) and corrosion protection compared to traditional zinc coatings, making it suitable for thermally stressed applications where standard galvanized steel fails.

 

2. Can DX55D +AS hot dip galvanized steel coil be used for deep drawing?

Yes. DX55D is classified as a special deep-drawing grade with low yield and tensile strength, ensuring excellent material flow during complex forming processes. The +AS coating's ternary alloy layer is optimized for deep drawing, and optional prelube oils or thin organic films can further enhance processability.

 

3. What is the maximum temperature DX55D +AS can withstand?

DX55D +AS hot dip galvanized steel coil can withstand temperatures up to 800°C without scaling or delamination, making it ideal for high-temperature applications such as automotive exhaust systems and industrial heating equipment. At 400°C, it retains 80% of its reflectivity for thermal insulation purposes.

 

4. Are there customizable options for DX55D hot dip galvanized steel coil?

Yes. We offer full customization, including thickness (0.2-4.0mm), width (600-2000mm), coil weight (3-8 tons), surface grade (regular/minimized/skin passed/zero spangle), coating weight (20-600g/m²), and additional treatments (oiling, passivation). Contact us for your specific requirements.

 

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