Hot dip galvanized series of metal coating steel plate or steel belt is our trade or processing of the use of the variety, such as galvanized, aluminum zinc, zinc aluminum magnesium coating.According to some foreign promotional materials, about half of the world’s zinc production is used in steel and steel products surface corrosion treatment.
Different hot – coated steel plates have different characteristics and trade, use characteristics.
Typical brand and logo of hot-dip galvanized products
Take hot pure zinc plating products as an example, there are three basic properties: base plate quality, coating type, coating weight, in different standards have different naming and identification methods
JIS G3302 SGCC Z08
Brand interpretation read
S: steel, steel
G: galvanized, galvanized
C: cold rolled, cold rolled
C: general, commercial
The suffix reads Z08
Main attribute: coating weight
Property 1: double thickness coating
Property 2: the minimum mean value of two-sided pure zinc coating weight in three-point test is 80g/m2, and the minimum value of single-point test is 68g/m2
Property 3 corresponds to a coating thickness of 0.017mm
ASTM A653 CS Type B G90
Brand interpretation
A653: ASTM A653/A653M, American standard
CS: general steel, commercial steel
Type B: class B component Type
The suffix reads G90
Main attribute: coating weight
Property 1: double thickness coating
EN 10346 S350GD+Z
Brand interpretation is small
D: flat products for cold forming
X: substrate state is determined
51: serial number, no specific meaning, for general use
D: code for hot dip coating
The suffix reads Z100
Main attribute: coating weight
Property 1: double thickness coating
Attribute 2: the minimum mean value of the total weight of the two-sided pure zinc coating in the three-point test is 100g/m2, while the minimum value of the single point test is 85g/m2
Characteristics and trade points of various hot – plating coatings
Pure zinc coating
Hot dip galvanized zinc pot zinc content is not less than 99%, is the most economic corrosion coating type.
Pure zinc-coated steel plates are divided into two types: zinc-free and zinc-coated, and their corrosion resistance is almost the same.If the subsequent need to spray or paint, no zinc flower products will be more beautiful;While thick zinc layer products are usually flowered (such as zinc layer weight 275g/m2 on both sides)
Aluminum and zinc coating
The plating solution contains about 55% aluminum, about 1.6% silicon, the remaining component is zinc, aluminum zinc coating in most of the environment corrosion resistance is higher than pure zinc coating, aluminum zinc coating steel coils are zinc flowers.Excellent steel mill can produce even beautiful zinc flower, for home appliances products directly bare, but aluminum zinc coating also has some shortcomings.
The welding performance of aluminum and zinc coating steel plate is not as good as that of pure zinc.Because the hardness of the bonded metal after melting is relatively high, the removal efficiency of ordinary grinding tools is very low, which will lead to the scrap of the electrode. Therefore, the welding process should be minimized in use.
In addition, the protection of aluminum and zinc coating on steel plate cutting is far less than that of pure zinc coating (it is far less than that of zinc, aluminum and magnesium coating), the need to do a good job in cutting anti-corrosion work (such as painting closure)
Zinc Aluminum Magnesium coating
This is a coating product with excellent comprehensive performance, developed and mass produced by Japan’s nissin steel company in the early 21st century, and registered the patent and trademark ZAM.The corrosion resistance of zinc-aluminum-magnesium coating is much higher than that of zinc-plating and aluminum-zinc plating, the protection of cutting holes is excellent, and the welding performance is very good.
At the beginning of the construction of photovoltaic farms in China, zinc, aluminum and magnesium steel plates are often used to manufacture photovoltaic supports.An obvious feature of this product is the obvious trace of coating corrosion near the cutting hole.