Q355 galvanized sheet is a high-performance composite steel with Q355 structural steel as the base material and a hot-dip galvanized surface. It is widely used in fields with high requirements for strength and durability, such as building structures, automotive parts, home appliance housings, and industrial equipment.

Chemical Composition

Element	Content (%)
Carbon (C)	≤0.20
Silicon (Si)	≤0.55
Manganese (Mn)	1.00 - 1.60
Phosphorus (P)	≤0.045
Sulfur (S)	≤0.045
Nickel (Ni)	≤0.30
Chromium (Cr)	≤0.30
Copper (Cu)	≤0.30
Niobium (Nb)	≤0.07
Vanadium (V)	≤0.15
Titanium (Ti)	≤0.20

Common Specifications

Parameter	Specifications
Thickness	0.3mm – 6.0mm (varies by manufacturer)
Width	600mm – 1500mm (standard), or customized
Zinc Coating	Common options:
	- Z60 (60g/m², single/dual-side)
	- Z80 (80g/m²)
	- Z120 (120g/m²)
	- Other coatings (e.g., Z180, Z275) available on request

Key Features

High strength
Due to the proportion of low-alloy high-strength steel and the controlled rolling and controlled cooling process, the internal structure of the material is dense and uniform, with higher structural stability and anti-destruction ability. The minimum yield strength of a Q355 galvanized sheet can reach 355MPa, and the tensile strength is as high as 470-630MPa. It can effectively withstand external loads and impacts and is suitable for various load-bearing components.

Excellent corrosion resistance
The surface of the Q355 galvanized sheet forms a uniform and continuous zinc layer by hot-dip galvanizing, which can effectively isolate moisture and corrosive media from erosion of steel. At the same time, zinc has a "sacrificial anode" effect. Even if the coating is partially damaged, it can protect the exposed steel by electrochemical means, making it suitable for humid and corrosive environments.

Strong weather resistance
The thermal expansion coefficient of the zinc layer is close to that of the steel substrate, and the interface will not be separated due to thermal expansion and contraction in a hot and cold cycle environment, so that the Q355 galvanized sheet can maintain structural stability and zinc layer adhesion in the range of -40°C to +120°C without peeling or flaking.

Applications

Field	Application Examples
Construction	Roofing, wall panels, and steel structures
Automotive	Body parts, chassis components
Appliances	HVAC systems, electrical cabinets
Industrial	Storage tanks, agricultural equipment, guardrails

Packaging

FAQ

Q: What is Q355 galvanized sheet?

A: Q355 galvanized sheet is a type of steel sheet with a zinc coating. The base metal is Q355 steel, which has a yield strength of 355 MPa. The galvanized coating provides good corrosion resistance, protecting the steel from rust and other forms of corrosion.