In some countries, the method of expressing the thickness of the zinc layer of galvanized sheet is directly Z40g Z60g Z80g Z90g Z120g Z180g Z275g
The amount of zinc plating is a commonly used effective method to express the thickness of the zinc layer of the galvanized sheet.
Standard value of galvanized quantity in China: the unit of galvanized quantity is g/m2
1oz=0.0284kg, so 0.9oz=0. 02556kg=25.56g 1ft2=0.093m2 25.56g/0.093m2=275g/m2
Fo example: G90 means that the average minimum weight measured on both sides of the galvanized sheet at three points is 0.9oz/ft2, that is, the SI unit is 275g/m2.
Simply put, the galvanized sheet G60 is what we usually call the Z180g zinc-coated galvanized sheet.
There are also customers who like to use the unit of how many microns to calculate the thickness of the zinc layer. Here is a analysis for you
The density of zinc is 7.14 g/cm3; so 275/7.14=38.5154cm3=38515.4mm3, that is, the average thickness per square meter is 38.5154 microns. (Single-sided) Double-sided is half of it.
If the thickness gauge is used for acceptance, the measured average thickness may be higher than 38 microns, because the roughness of the steel surface and the roughness of the coating will affect the test results. The greater the roughness, the greater the measured thickness.
Hot-dip galvanized layer thickness standard,
How thick is the galvanized layer?
Electro-galvanized thickness standard
Zinc layer thickness X zinc layer density 7.14 = zinc layer weight
First remember that 7.14 is the density of zinc!
No matter how many grams per square meter the other party says
Just use this number ÷ 7.14, the result is the thickness per square meter, in micrometers
For example, how thick is 80 grams of zinc per square meter?
80÷7.14=11.2（μm）
Or someone asked for the amount of zinc to be 70 microns, how many grams per square meter?
70*7.14=499.8 g/㎡
Win Road International Steel Product
Post time: Dec-20-2021