Zinc layer grade and anti-corrosion ability
EN 10346 standard
|
Zinc layer code |
Double-sided zinc layer weight(g/m²) |
Applicable environment |
Life expectancy (years) |
|
Z100 |
100 |
Low corrosion (dry, indoor) |
5~10 |
|
Z120 |
120 |
Normal urban climate |
8~12 |
|
Z140 |
140 |
General outdoor (low humidity) |
10~15 |
|
Z180 |
180 |
Moderate corrosion (industrial area, suburbs) |
12~18 |
|
Z200 |
200 |
High humidity, slight pollution |
15~20 |
|
Z275 |
275 |
Harsh environment (coastal, chemical industry area) |
20+ |
Z100-Z140 is suitable for short-term or low-corrosion environments, Z180-Z275 is suitable for long-term corrosion protection
Select zinc layer according to building use
(1) Lightweight roof/wall (warehouse, factory, greenhouse)
Recommended zinc layer: Z120-Z180
Reason:
Under normal climate (no strong acid rain, salt spray), it can meet the anti-corrosion requirements for 10-15 years.
The cost is low and suitable for projects with limited budget.
(2) Civil buildings (residential, commercial buildings)
Recommended zinc layer: Z140-Z200
Reason:
Both aesthetics and durability must be taken into account. A zinc layer that is too thin will easily rust and affect the appearance.
If it is in a humid or rainy area, Z200 or above is recommended.
(3) Highly corrosive environment (coastal, industrial area)
Recommended zinc layer: Z275 or galvanized aluminum (AZ150)
How to prolong the zinc coating life of DX51D galvanized coil?
Choose a thick zinc layer: Choose Z275 or galvanized zinc (AZ150) for harsh environments
Standardized installation: Use galvanized/stainless steel fasteners to avoid mechanical damage to the zinc layer
Enhanced protection: Apply anti-rust paint or color coating to high-corrosion areas, and galvanized zinc is preferred in coastal areas
Regular maintenance: Clean the surface with water every year and repair damaged parts in time
What is the difference between DX51D steel coil and stainless steel?
|
Features |
DX51D galvanized steel |
Stainless steel |
|
|
Base material |
Low carbon steel (iron + carbon) |
Iron-based alloy (containing chromium ≥ 10.5%, may contain nickel and molybdenum) |
|
|
Surface treatment |
Hot dip galvanized (zinc layer protection) |
Naturally formed passive chromium oxide film (Cr₂O₃) |
|
|
Corrosion resistance |
Medium (depends on zinc layer thickness) |
Extremely strong (especially 316 containing molybdenum, resistant to salt spray/acid and alkali) |
|
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Strength |
Tensile strength 270-500MPa |
Higher (304 stainless steel about 520-750MPa) |
|
|
Processability |
Easy to stamp and bend (zinc layer may crack) |
High hardness, special tools required (easy to work harden) |
|
|
Lifespan |
10-20 years (depends on zinc layer and environment) |
More than 30 years (in a suitable environment) |