What is the outside diameter of dn40 galvanized steel pipe? How to choose?

What is the outside diameter of dn40 galvanized steel pipe? How to choose?

What is the outside diameter of dn40 galvanized steel pipe?

The outer diameter of dn40 galvanized steel pipe is the sum of the inner diameter plus the wall thickness. Usually, the inside diameter of DN40 pipe is 43.5 mm, and the wall thickness is normal and thickened. The normal type is 3.5 mm and the outside diameter is 47 mm. The thickened type has a wall thickness of 4.25 mm and the outside diameter is 48.5 mm.

Galvanized steel pipe can be divided into electric galvanized and hot galvanized, hot galvanized core layer is thick, and the coating is very uniform, adhesion is relatively strong, and the use time is long. And the use of galvanizing cost is very low, the surface is a little rough, its corrosion resistance is much worse than hot dip galvanizing pipe.

How to buy galvanized pipe:

1, first of all, when choosing galvanized pipe, we should look at its material. Good galvanized pipe material is pure, no impurities, and the steel density is large, the size will not exceed the standard. Therefore, when choosing, can be identified by vernier caliper measurement or weighing, usually heavy weight for good galvanized pipe.

2. Secondly, when choosing galvanized pipe, we should look at its surface process. Good galvanized pipe is produced by professional equipment, and the surface coating is thick and smooth, and it is not easy to scratch. On the contrary, some small manufacturers due to simple equipment, the production of galvanized pipes have burrs, will damage the steel surface, and even reduce the strength of steel.

3, then in the selection, to look at its surface, good pipe surface luster, on the contrary, if the surface is light red, it is not recommended to choose. In addition, the good galvanized pipe cross section composition is uniform, the magnetic cutting surface is smooth and flat, there will be no meat off. And the inferior pipe transverse bar is thin and low, and the pass shape is not satisfied. There are also large ear defects in the head and tail