Zinc Thickness

Zinc Coating Type	Zinc Coating Weight Range (g/m², double-sided)	Key Characteristics
Standard Zinc Coating	60-100	Moderate cost, basic corrosion resistance; suitable for dry/mildly humid environments
Medium-thick Zinc Coating	120-275	Better corrosion resistance; resistant to moisture and general atmospheric corrosion
Thick Zinc Coating	350-600+	High corrosion resistance; resistant to acid-alkali mist, coastal high salt spray, and industrial exhaust environments

Recommended Available Sizes

Thickness(mm)	Width(mm)	Length(mm)
6	1500	6000
8	1800	8000
12	2000	6000
16	2200	8000
20	2500	6000
25	1500	8000
30	1800	6000
50	2000	8000
80	2200	6000
100	2500	8000

Galvanizing Process

Surface Preparation:

Clean the steel sheet to remove oil, rust, and contaminants via degreasing, pickling, and rinsing.

Fluxing:

Apply a flux solution to prevent re-oxidation and aid zinc adhesion.

Galvanizing:

Immerse the sheet in a molten zinc bath (around 450°C) to form a zinc-iron alloy coating.

Cooling & Finishing:

Cool the galvanized sheet, then inspect, trim, or passivate if needed.

Zinc Coating Selection

Method	Zinc Coating Thickness	Best For
Hot-Dip Galvanizing (GI)	50–600 g/m² (typically Z100–Z275)	Outdoor structures, harsh environments (e.g., marine, industrial)
Electro-Galvanizing (EG)	10–30 g/m² (e.g., E8, E16, E24)	Indoor applications, electronics, automotive parts

Advantages

Advantages	Details
Corrosion Resistance	Zinc layer blocks corrosion, offers sacrificial protection. Long - lasting in harsh environments like coastal areas.
Mechanical Properties	Retains Q345A's high strength (yield/tensile). Good formability for bending, cutting, welding.
Cost - effectiveness	Higher initial cost but lower long - term costs (less maintenance, replacement). Stable supply cuts procurement costs.
Aesthetic Appeal	Uniform, shiny surface enhances visual look. Suits architectural exterior uses without extra coatings sometimes.

Packaging

DX51D GI Galvanized Steel Plate Manufacturer

FAQ

Q: What is Q345A galvanized steel plate?
A: It's a low-alloy high-strength steel plate (Q345A grade) with a zinc coating for enhanced performance.

Q: What's the main purpose of the zinc coating?
A: To resist corrosion by blocking moisture/air and providing sacrificial protection for the steel.

Q： Can Q345A galvanized steel be welded?

A： Yes, but proper techniques (like preheating) may be needed to avoid zinc vapor issues.

Q：What's the difference between Q345A and Q345B?

A：

Q345A has lower impact toughness (no required Charpy test at -20°C).

Q345B has better low-temperature performance (tested at -20°C).

Q：How long does it take to ship after paying the final payment?

A：About 7-15 days.

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