Galvanized Steel Coil/sheet

 

1. Hot-Dip Galvanized Steel Coil (HDG)

Zinc coating: Z30–Z275

Thickness: 0.12–6.0 mm

Application: construction, pipes, structures

Advantage: strong corrosion resistance

2. Electro-Galvanized Steel Coil (EG)

Uniform coating with smooth surface

Application: automotive, appliances

Advantage: better surface finish

3. Galvanized Steel Sheet

Flat sheet form for fabrication

Application: panels, enclosures, machinery

4. Corrugated Galvanized Sheet

Used for roofing and siding

High strength and weather resistance

 

Construction Industry

Widely used in roofing sheets, wall panels, structural frames, and steel buildings due to its long-term corrosion resistance.

Automotive Industry

Applied in car body panels and structural components to improve durability and safety.

Home Appliances

Used in refrigerators, washing machines, and air conditioners for its clean surface and corrosion resistance.

HVAC & Ventilation

Ideal for duct systems and ventilation structures due to its strength and anti-rust properties.

 

Parameter	Specification	Unit	Notes / Applications
Steel Grade	DX51D / SGCC / ASTM A653	–	Hot-dip galvanized carbon steel
Zinc Coating	Z30, Z60, Z90, Z120, Z150, Z275	g/m²	Z275 recommended for outdoor exposure
Coil Width	600 – 1250	mm	Can be customized per project requirements
Coil Thickness	0.12 – 3.0	mm	Standard tolerances apply (±0.02 mm)
Coil ID	508 / 610	mm	Inner diameter options for handling
Coil Weight	3 – 8	tons	Depends on thickness & width
Surface Finish	Spangle / Zero Spangle	–	Optional; affects appearance & corrosion resistance
Length	Coils (continuous)	m	Can be slit into sheets if needed
Applications	Roofing, Construction, Automotive, Appliances, Ducts	–	Wide range of industrial & commercial use
Standard	ASTM A653 / JIS G3302 / EN 10346	–	Compliance with international quality standards
Delivery Condition	Oiled / Non-Oiled	–	Protects surface during transport
Custom Options	Thickness, Width, Zinc Coating, Surface Finish	–	OEM / Project-specific orders

 

 

 

 

Standard	Grade	C	Si	Mn	P	S	Ti
Forcold Forming Chinese Standard	DX51D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX52D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX53D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX54D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX56D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX57D+Z	0.12	0.50	0.60	0.100	0.045	0.30
Forcold Forming Japanese Standard	SGCC	0.15	0.50	0.80	0.050	0.030	0.025
	SGCD1 SGCD2	0.12 0.10	0.50 0.50	0.60 0.45	0.040 0.030	0.030 0.030	0.025 0.025
	SGCD3	0.08	0.50	0.45	0.030	0.030	0.025
	SGCD4	0.06	0.50	0.45	0.030	0.030	0.025
For Structure Japanese Standard	SGC340	0.25	0.50	1.70	0.200	0.035	0.025
	SGC400 SGC440	0.25 0.25	0.50 0.50	1.70 2.00	0.200 0.200	0.035 0.035	0.150 0.150
	SGC490	0.30	0.50	2.00	0.200	0.035	0.025
	SGC510	0.30	0.50	2.50	0.200	0.035	0.025
For Structure AISI Standard	S220GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S250GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S280GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S320GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S350GD+Z	0.20	0.60	0.70	0.100	0.045	0.150
	S550GD+Z	0.20	0.60	0.70	0.100	0.045	0.150

 

 

 

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	-

 

 

 

 

 

Use Environment	Recommended Coating	Expanded Application Scenarios	Applicable Thickness
Indoor Use	Z10-Z12 (100-120g/m²)	• Electronics cabinets & server racks • Office furniture frames • Dry storage shelving	0.3-1.2mm (light structural load)
Suburban Areas	Z20 + Painting (200g/m²)	• Residential fencing & gates • Garden sheds • Bus stop shelters	0.5-2.0mm (medium load bearing)
Urban/Industrial Areas	Z27/G90 + Painting (≥270g/m²)	• Factory roofing & ducting • Highway sound barriers • Chemical plant walkways	0.8-3.0mm (high corrosion stress)
Coastal Areas	>Z27/G90 + Painting (e.g. Z350)	• Port crane structures • Offshore wind turbine towers • Seaside resort balconies	1.5-6.0mm (salt spray resistance)
Stamping/Deep Drawing	>Z27/G90 + Anti-peeling coating	• Automotive fuel tanks (Z100: 0.8-1.5mm) • HVAC duct components (Z180: 0.5-1.2mm) • Battery enclosures (Z275: 1.0-2.5mm)	0.5-2.5mm (formability

 

 

 

Application Scenario	Recommended Coating/Material	Thickness Range	Key Technical Features
1. Modular Building Wall Panels	AZ150 Galvalume + PVDF	0.4-0.8mm	Lightweight + weather resistance (30-year warranty)
2. Underground Garage Vent Ducts	Z275 GI + Passivation	0.7-1.2mm	Passivation against condensation corrosion
3. High-Speed Rail Platform Canopies	Z350 GI + Silane coating	1.5-2.5mm	Silane coating prevents industrial dust adhesion
4. Prefab Building Connectors	DX54D+Z + HDG	3.0-6.0mm	Hot-dip galvanized bolt holes (2000h salt spray)
5. NEV Battery Trays	Z275 GI + AF coating	1.2-2.0mm	Anti-fingerprint + electrolyte resistance
6. Ship Deck Auxiliary Structures	AZM150 AlMgZn	2.5-4.0mm	Marine salt spray resistance (>4000h)
7. Logistics Container Floors	DX53D+Z + Z120	1.8-2.5mm	High impact resistance against forklifts
8. Aircraft Hangar Fire Door Liners	Z450 GI + Intumescent coating	1.0-1.5mm	Intumescent fireproofing (1200°C resistance)
9. PV Bracket Rotating Bases	AZ100 Galvalume	2.0-3.5mm	Sand abrasion resistance (coating hardness ≥150HV)
10. Wind Turbine Tower Interior	Z550 GI + Epoxy	6.0-12.0mm	Anti-micro-vibration corrosion
11. Hydraulic Machine Guards	Z180 GI + Powder coating	1.5-3.0mm	Electrostatic powder coating against oil
12. Nuclear Plant Cable Trays	Z275 GI + Cr-free passivation	1.2-2.0mm	Chromium-free passivation (RoHS compliant)
13. Cold Chain Logistics Racking	Z200 GI + Low-E coating	0.8-1.5mm	Low-emissivity coating prevents condensation
14. Medical Sterilization Cart Trays	Z100 GI + Antibacterial coating	0.5-0.8mm	Nano-silver antibacterial coating (99% efficacy)
15. Sound Barrier Backing Plates	AZ70 Galvalume	0.6-1.0mm	30%+ perforation + anti-rain noise
16. Vertical Farming Planters	Z275 GI + Fluoropolymer coating	0.4-0.7mm	Fluoropolymer resists nutrient

 

 

 

Scenario	Recommended Solution	Performance Verification
17. Desert PV Field Bolts	Z450 GI + Dacromet coating	5,000 sand erosion cycles without rust
18. Chemical Reactor Brackets	AZM200 + PVDF film lamination	Resists 98% sulfuric acid spray (168h)
19. Geothermal Well Casings	Z600 GI + Glass-flake coating	150°C steam environment (10-year lifespan)
20. Antarctic Station Walls	AZ150 + Ceramic composite coating	-70°C anti-embrittlement certification

Technical Notes

Thickness Selection Logic:

Thin gauge (≤1.0mm): Light-duty applications (appliances/interiors)

Medium gauge (1.0-3.0mm): Structural components (construction/machinery)

Heavy gauge (≥3.0mm): Severe corrosion/load-bearing scenarios (energy/infrastructure)

 

 

Surface Treatment Type	Code	Features
Chromic Acid Treatment	C	Good corrosion resistance, suitable for bare state
Chromic Acid Treatment+Oiling	S	Good corrosion resistance
Phosphoric Acid Treatment (Including Sealing Treatment)	P	Have a certain corrosion resistance, good paint performance
Phosphoric Acid Treatment (Including Sealing Treatment)+Oiling	Q	Has a certain corrosion resistance, good paint performance, prevent rust during transportation and storage
Phosphoric Acid Treatment (Excluding Sealing Treatment)	T	Have a certain corrosion resistance, good paint performance
Phosphoric Acid Treatment (Excluding Sealing Treatment)+Oiling	V	Has a certain corrosion resistance, good paint performance, and prevent rust
Oiling	O	Prevent rust during transportation and storage
No Treatment	M	Suitable for immediate painting

 

 

Chinese Standard	Japan Standard	European Standard
DX51D Z/DC51D Z (CR)	SGCC	DX51D Z
DX52D Z/DC52D Z	SGCD1	DX52D With
DX53D Z/DC53D Z/DX54D Z/DC54D Z	SGCD2/SGCD3	DX53D Z/DX54D Z
S220/250/280/320/350/550GD Z	SGC340/400/440/490/570	S220/250/280/320/350GD Z
DX51D Z/DD51D Z (HR)	SGHC	DX51D Z

Material	Corrosion Resistance	Cost	Typical Application
Galvanized Steel (GI)	High	Medium	Construction, general use
PPGI Steel	Higher	Higher	Roofing, decorative
Galvalume Steel (GL)	Excellent	Higher	Marine, industrial
Cold Rolled Steel	Low	Low	Indoor use

 

The price of galvanized steel coil and sheet is influenced by several key factors:

Zinc Coating Weight (Z30–Z275) – higher coating = higher cost

Thickness & Width – thicker materials increase price

Steel Grade – high strength grades cost more

Market Steel Price – fluctuates globally

Order Quantity – bulk orders reduce unit price

 

We implement strict quality control procedures to ensure product reliability:

Raw material chemical composition analysis

Mechanical property testing

Zinc coating thickness inspection

Surface quality inspection

Third-party inspection available (SGS, BV, TUV)

Mill Test Certificate (MTC) provided for full traceability

 

 

Standard seaworthy export packing

Steel strips + waterproof paper + wooden pallet

Coil inner diameter: 508mm / 610mm

Delivery time: 7–25 days depending on order

Global shipping available

 

 

 

Basic Understanding

1. What is galvanized steel made of?

Galvanized steel is made from carbon steel that is coated with a layer of zinc to protect against corrosion.

2. Why is zinc used in galvanizing?

Zinc provides both a physical barrier and sacrificial protection, preventing rust even if the surface is scratched.

3. Is galvanized steel stronger than regular steel?

The base strength is similar, but galvanized steel has better durability due to corrosion resistance.

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Technical Specifications

4. What does Z30, Z60, Z100, Z275 mean?

These numbers represent zinc coating weight (g/m²). Higher values mean better corrosion resistance.

5. What is the standard thickness tolerance?

Thickness tolerance typically follows ASTM or EN standards, usually ±0.02 mm to ±0.05 mm.

6. What is spangle in galvanized steel?

Spangle refers to the visible crystalline pattern on the surface formed during the galvanizing process.

7. What is zero spangle galvanized steel?

Zero spangle steel has a smooth surface without visible crystal patterns, ideal for painting.

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Production & Process

8. How is hot-dip galvanized steel produced?

Steel is immersed in molten zinc at around 450°C, forming a metallurgical bond between zinc and steel.

9. What is electro-galvanizing?

Electro-galvanizing uses an electric current to apply a thinner, more uniform zinc coating.

10. Which is better: HDG or EG?

HDG: better corrosion resistance

EG: better surface finish

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Performance & Durability

11. How long does galvanized steel last outdoors?

It can last 20–50 years depending on coating thickness and environmental conditions.

12. Is galvanized steel waterproof?

Yes, the zinc coating prevents water from reaching the steel surface.

13. Does galvanized steel require maintenance?

Minimal maintenance is required compared to other materials.

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Comparison Questions 

14. Galvanized steel vs stainless steel – which is better?

Stainless steel: higher corrosion resistance, higher cost

Galvanized steel: more cost-effective for general use

15. Galvanized steel vs aluminum – what’s the difference?

Aluminum: lighter, naturally corrosion-resistant

Galvanized steel: stronger and more economical

16. GI vs GL vs PPGI – which should I choose?

GI: general construction

GL: harsh environments

PPGI: decorative and roofing

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Applications

17. Can galvanized steel be used for roofing?

Yes, it is widely used in roofing due to its weather resistance.

18. Is galvanized steel suitable for outdoor structures?

Yes, especially with higher zinc coatings like Z275.

19. Can galvanized steel be used in marine environments?

Yes, but Galvalume or additional coatings may perform better in extreme marine conditions.

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Processing & Fabrication

20. Can galvanized steel be welded?

Yes, but proper ventilation is required due to zinc fumes.

21. Can galvanized steel be painted?

Yes, especially electro-galvanized or zero spangle surfaces.

22. Is galvanized steel easy to cut and bend?

Yes, it has good formability and is widely used in fabrication.

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Pricing & Purchasing

23. What affects galvanized steel price the most?

Zinc coating weight

Thickness

Steel grade

Market steel prices

24. What is the price of galvanized steel per ton?

Prices vary based on market conditions, typically ranging depending on specifications and coating.

25. Is galvanized steel cheaper than stainless steel?

Yes, significantly cheaper while still offering good corrosion resistance.

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Quality & Standards

26. What standards does galvanized steel follow?

ASTM A653

EN 10346

JIS G3302

27. How do you check zinc coating thickness?

Using coating thickness gauges or laboratory testing.

28. What certifications are provided?

Mill Test Certificate (MTC)

SGS / BV / TUV inspection reports

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Logistics & Supply

29. What is the typical MOQ?

Usually 25 tons, but flexible depending on supplier.

30. How is galvanized steel packed for export?

Standard seaworthy packing with steel straps and waterproof wrapping.

31. How long is the delivery time?

Typically 7–25 days depending on order size.

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Buyer-Oriented Questions

32. How to choose the right galvanized steel coil?

Consider:

Application

Environment

Coating weight

Thickness

33. Can you customize galvanized steel products?

Yes, thickness, width, coating, and surface can be customized.

34. Do you offer factory prices?

Yes, direct factory supply ensures competitive pricing.

 

30+ years manufacturing experience

SGS / BV inspection available

Fast delivery (7–15 days)

Export to Middle East / Southeast Asia

Custom width & coating

Xi'an Dongmeng Group Co., Ltd. is one of the leading galvanized steel coil/sheet manufacturers and suppliers in China. We warmly welcome you to buy or wholesale cheap galvanized steel coil/sheet in stock here from our factory. All customized products are with high quality and competitive price. For free sample, contact us now.

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