Name: Galvanized Coil/Plate
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Galvanized Coil/Plate

Galvanized steel coil/plate is a carbon steel product coated with a layer of zinc through the hot-dip galvanizing process. This material offers excellent corrosion resistance, good formability, and superior surface quality, making it suitable for various applications in construction, automotive, and general manufacturing industries.

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◉ PRODUCT SPECIFICATION

1. Material Standards & Grades

Primary Standards:

ASTM A653 - Galvanized Steel Sheet
EN 10346 - Continuously hot-dip coated steel flat products
JIS G3302 - Hot-dip galvanized steel sheets and coils
GB/T 2518 - Continuous hot-dip galvanized steel sheets and strips

Common Grade Categories:

Category	Typical Grades	Coating Type	Key Applications
Commercial Quality	DX51D+Z, SGCC	Regular zinc	General purpose
Structural Quality	S280GD+Z, S350GD+Z	Regular zinc	Structural components
Drawing Quality	DX52D+Z, DX53D+Z	Regular zinc	Forming applications
Aluminum-Zinc	S280GD+AZ, S350GD+AZ	55% Al-Zn	High temperature

2. Chemical Composition (% by weight, Base Steel)

Element	Commercial Quality	Structural Quality	Drawing Quality
Carbon (C)	≤ 0.12	≤ 0.20	≤ 0.08
Manganese (Mn)	≤ 0.60	≤ 1.50	≤ 0.45
Phosphorus (P)	≤ 0.045	≤ 0.035	≤ 0.030
Sulfur (S)	≤ 0.045	≤ 0.035	≤ 0.030
Silicon (Si)	-	≤ 0.30	-
Aluminum (Al)	≥ 0.020	-	≥ 0.020

3. Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Hardness (HRB)
DX51D+Z	140-300	270-420	≥ 22	45-65
DX52D+Z	140-260	270-380	≥ 26	40-60
DX53D+Z	140-220	270-350	≥ 30	35-55
S280GD+Z	≥ 280	360-510	≥ 18	55-75
S350GD+Z	≥ 350	420-540	≥ 16	60-80

4. Coating Specifications

Zinc Coating Classes (g/m²):

Coating Designation	Total Coating Mass	Single Side Minimum	Typical Applications
Z060	60	45	Indoor applications
Z080	80	60	Light duty outdoor
Z100	100	75	General outdoor
Z120	120	90	Medium corrosion
Z150	150	113	Heavy duty outdoor
Z180	180	135	Severe environments
Z200	200	150	Extreme conditions
Z275	275	206	Special applications

5. Physical Properties

Property	Typical Value	Test Standard
Density (steel base)	7.85 g/cm³	ASTM E1266
Density (zinc coating)	7.14 g/cm³	-
Modulus of Elasticity	200-210 GPa	ASTM E111
Thermal Expansion Coefficient	11.5-12.5 × 10⁻⁶/°C	ASTM E228
Thermal Conductivity	50-60 W/m·K	ASTM E1225

6. Product Specifications

Parameter	Standard Range	Tolerance	Available Customization
Thickness	0.3mm - 6.0mm	±0.03-0.15mm	0.2mm - 8.0mm
Width	600mm - 2000mm	±1.0-3.0mm	500mm - 2500mm
Coil Weight	3-25 tons	±2%	1-30 tons
Coil ID	508mm/610mm	±5mm	400mm-800mm
Coil OD	1000mm-2000mm	±20mm	800mm-2200mm

7. Surface Treatment Options

Surface Finish	Coating Type	Characteristics	Applications
Regular Spangle	Zinc	Visible spangle pattern	General use
Minimum Spangle	Zinc	Reduced spangle	Painting substrate
Smooth Surface	Zinc	Skin passed	Automotive
Chromated	Zinc+Chromate	Enhanced corrosion resistance	Electronics
Phosphated	Zinc+Phosphate	Improved paint adhesion	Automotive parts
Aluminum-Zinc	55% Al-Zn	Heat resistance	High temperature

8. Testing & Inspection

Standard Tests:

Tensile test (ASTM E8/ISO 6892-1)
Bend test (ASTM E290/ISO 7438)
Coating mass measurement (ASTM A90/ISO 1460)
Chemical analysis
Adhesion test
Surface inspection
Dimensional inspection

Optional Tests:

Salt spray test (ASTM B117/ISO 9227)
Cyclic corrosion test
Coating uniformity test
Microstructure examination
Third-party inspection

9. Applications

Primary Applications:

Construction Industry: Roofing, wall panels, structural members
Automotive: Body panels, chassis components, interior parts
Home Appliances: Refrigerators, washing machines, air conditioners
Electrical: Enclosures, switch boxes, distribution boards
Agricultural: Grain storage, farm equipment, greenhouses
General Manufacturing: Furniture, storage racks, containers

Processing Capabilities:

Stamping and forming
Welding (spot welding, arc welding)
Roll forming
Painting and coating
Cutting and punching

◉ Surfcae selection

SURFACE	CHARACTERISTIC	SUMMARY OF MANUFACTURING METHOD	APPLICATION
NO.1	Silvery white	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.1	lackluster	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.2D	Silvery white	After cold rolling, heat treatment and pickling are carried out	General material, deep material
NO.2B	Gloss is stronger than No.2D	After No.2D treatment, the final light cold rolling is carried out through the polishing roller	The general material
BA	As bright as a sixpence	No standard, but usually a bright annealed surface with high reflectivity.	Building materials, kitchen utensils
NO.3	Rough lapping	Grind with 100~200# (unit) strop tape	Building materials, kitchen utensils
NO.4	Intermediate grinding	Polished surface obtained by grinding with 150~180# strop abrasive tape	Building materials, kitchen utensils
NO.240	Fine lapping	Grinding with 240# strop abrasive tape	kitchenware
NO.320	Very fine grinding	Grinding was carried out with 320# strop abrasive tape	kitchenware
NO.400	The luster is close to BA	Use 400# polishing wheel to grind	General timber, building timber, kitchen appliances
HL	Hairline grinding	Suitable particle material for hair stripe grinding (150~240#) with many grains	Building, construction material
NO.7	It's close to mirror grinding	Use a 600# rotary polishing wheel to grind	For art or decoration
NO.8	Mirror ultrafinish	The mirror is ground with a polishing wheel	Reflector, for decoration

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