What is the difference between S250GD+AZ steel and S250GD+Z?
|
Item |
S250GD+AZ |
S250GD+Z |
|
Heat resistance |
Resistant to high temperature of 300℃ (aluminum layer is resistant to oxidation) |
Only resistant to 120℃ (zinc layer is easy to volatilize at high temperature) |
|
Appearance |
Bright silver, more beautiful |
Off-white, easy to produce zinc spangles |
|
Conductivity |
Relatively low (aluminum layer has higher resistance) |
Excellent (zinc has better conductivity) |
|
Welding performance |
Parameters need to be adjusted (aluminum layer affects the fluidity of the molten pool) |
Applicable to conventional welding processes |
|
Cost |
10%~20% higher |
Economical |
|
Corrosion resistance |
3~6 times that of galvanizing (salt spray 2000h+) |
Salt spray 500~1000h |
|
Plating composition |
55% aluminum + 43.4% zinc + 1.6% silicon |
More than 99% pure zinc |
What is the material of S250GD+AZ galvanized steel?
S250GD+AZ is a hot-dip galvanized steel coil that complies with European standard EN 10346. It has a tensile strength (Rm) of 330-430 MPa, excellent corrosion resistance and medium strength. It is widely used in construction, home appliances and industrial fields.
S: Structural Steel
250: Yield Strength ≥250 MPa (actual range 250~330 MPa)
GD: Galvanized by Hot-Dip
+AZ: Aluminum-Zinc Coating (55% Al, 43.4% Zn, 1.6% Si)
What is S250GD+AZ steel coil equivalent to?
S250GD+AZ is a galvanized steel coil under the European standard EN 10346 system. The equivalent or similar grades in different countries/regions are as follows:
|
Standard system |
Equivalent/Similar Grades |
Key differences |
|
China (GB) |
AZ150 (GB/T 14978) |
The coating is the same, but the GB standard does not strictly correspond to the strength level |
|
USA (ASTM) |
AZ50 (ASTM A792) |
The coating unit is different (50=0.50 oz/ft²≈150g/m²) |
|
Japan (JIS) |
SGAC 250 (JIS G3321) |
The strength is similar, but the coating code system is different (such as Z18≈180g/m²) |
|
International (ISO) |
HD250AZ (ISO 4997) |
The performance parameters are basically the same |
S250GD+AZ Galvanized Steel Coil is used for?
(1) Construction
Roof/wall: coastal buildings (resistance to salt spray corrosion).
Color-coated substrate: PVDF/PET coating, used for high-end curtain walls and airports.
Steel structure accessories: purlins, gutters, drainage systems.
(2) Home appliance manufacturing
Air conditioner outdoor unit: resistant to heat and humidity and salt spray environment.
Washing machine inner drum: resistant to detergent corrosion.
Oven shell: resistant to high temperature oxidation.
(3) Industrial equipment
Grain silo/feed equipment: resistant to organic acid corrosion.
Solar support: lightweight + long-term anti-corrosion.
