What is the biggest difference between galvanized sheet with and without zinc flower?

What is the biggest difference between galvanized sheet with and without zinc flower?

"Flower" is actually a layer of ice crystal particles on the surface of steel
And there are flowers and no flowers are based on the needs of customers
For example, some customers for construction and other external surfaces need to be smooth without zinc flower
And some need to have zinc flower, and flower is divided into normal zinc flower, small zinc flower and so on

What is the thickness of zinc coating on galvanized steel sheet

There are two kinds of galvanizing methods for thin plate, hot-dip galvanizing and electroplating. The thickness of hot-dip galvanizing is generally 60-300g / m2 (one side), which is used for parts with strong corrosion resistance. The thickness of galvanized layer is 10-50g / m2 (one side), which is mostly used for painted parts or non painted parts with low corrosion resistance
Baidu to, you use a division of density to know, how not to find information first

How to calculate the area of air duct

What area of galvanized steel plate should be used for 2000 * 400 air duct

How long is it? Each section is 1.2 meters long, with galvanized coil about 5.2 meters long

How to calculate the area of air duct elbow?

It depends on what you do
If it is processing production blanking, it is necessary to calculate the expansion area, and consider the additional bite
If it's budget, it's easy and effective to measure the elbow axis center (the point where the axes of two straight pipe segments intersect) and regard the elbow as a part of the straight pipe. The error is not very large, and there won't be many pipe elbows. Even if the amount varies, it won't affect the accuracy of the total amount. Budget is not a mathematical problem, so it's unnecessary to calculate it accurately. (unless your pipes are all elbows)

If the ventilation duct is a rectangular duct, what is the calculation formula of its expanded area?
If it is circular, what is the formula for calculating the expanded area?

Area of circular duct f = π * D * l
F -- expanded area of circular air duct (unit: m2)
D -- diameter of circular air duct
L -- length of pipeline center line
The area of rectangular duct is calculated by multiplying the perimeter of the drawing by the length of the pipe centerline

How to calculate the surface area of air duct?

Regular duct is easy to calculate, rectangular duct calculated surface area = = perimeter * duct length
Calculated surface area of circular duct = perimeter * duct length

How much does a 0.5cm thick iron plate weigh per square meter?

One square meter = 10 * 10 = 100 square decimeter
0.5cm = 0.05decimeter
Mass = 7.8kg/dm2 x0.05x100
=39kg

The weight of 5mm thick iron plate per square meter is needed urgently,

Known: S = 1 square meter, d = 5 mm = 0.005 m, ρ Fe = 7.8 * 10 ^ 3 kg / m3
M, Mg
According to the density formula ρ = m / V
M = ρ * V = ρ * s * d = 7.8 * 10 ^ 3 * 1 * 0.005 = 39 kg
So the gravity is g = mg = 39 * 10 = 390 n
Note: "weight" is a term used before. Now it can refer to the magnitude of gravity

Find the weight of the iron plate. It's four meters long, one meter fifty-two wide and four millimeters thick. How much is it

379.39 kg