Galvanized pipe threaded
Galvanized pipe threaded, also known as galvanized steel pipe, is divided into hot-dip galvanizing and electro-galvanizing. The hot-dip galvanizing layer is thick, with uniform coating, strong adhesion and long service life. The cost of electroplating is low, the surface is not very smooth, and its corrosion resistance is much worse than that of hot-dip galvanized pipes.
Galvanized steel pipes are divided into cold-plated pipes and hot-plated pipes. The former has been banned, and the latter has been promoted temporarily by the state.
Hot dip galvanized pipe.
The molten metal is reacted with an iron matrix to produce an alloy layer, thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is washed by ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then fed. Hot dip plating tank. Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. Most of the northern processes use galvanized strips to directly coil the zinc.
Cold galvanized pipe
Cold galvanizing is electrogalvanizing. The amount of galvanizing is very small, only 10-50g/m2, and its corrosion resistance is much worse than that of hot-dip galvanized pipe. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanizing (cold plating). Only small companies with small equipment and old equipment use electro-galvanized steel, of course, their prices are relatively cheaper. In the future, cold galvanized pipes should not be used as water and gas pipes.
Nominal wall thickness mm : 2.0 2.5 2.8 3.2 3.5 3.8 4.0 4.5
Coefficient c 1.064 1.051 1.045 1.040 1.036 1.034 1.032 1.028
Steel grade: Q215A; Q215B; Q235A; Q235B
Test pressure value / Mpa: D10.2-168.3mm is 3Mpa; D177.8-323.9mm is 5Mpa.
Galvanized management weight scale and formula
Galvanized management weight formula: (diameter - wall thickness) x wall thickness x0.02466 * 1.0599 = weight per meter (kg / m)
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| Specification | Wall
thickness |
specification | Wall
thickness |
specification | Wall
thickness |
specification | Wall
thickness |
| DN15 | 1.8 | DN40 | 1.8 | DN80 | 2.2 | DN150 | 2.5 |
| 2.0 | 2.0 | 2.5 | 2.75 | ||||
| 2.2 | 2.2 | 2.75 | 3.0 | ||||
| 2.5 | 2.5 | 3.0 | 3.25 | ||||
| 2.75 | 2.75 | 3.25 | 3.5 | ||||
| DN20 | 1.8 | 3.0 | 3.5 | 3.75 | |||
| 2.0 | 3.25 | 3.74 | 4.0 | ||||
| 2.2 | 3.5 | 4.0 | 4.25 | ||||
| 2.5 | DN50 | 1.8 | DN100 | 2.0 | DN200 | 2.75 | |
| 2.75 | 2.0 | 2.2 | 3.0 | ||||
| DN25 | 1.8 | 2.2 | 2.5 | 3.25 | |||
| 2.0 | 2.5 | 2.75 | 3.5 | ||||
| 2.2 | 2.75 | 3.0 | 3.75 | ||||
| 2.5 | 3.0 | 3.25 | 4.0 | ||||
| 2.75 | 3.25 | 3.5 | 4.25 | ||||
| 3.0 | 3.5 | 3.75 | 4.5 | ||||
| 3.25 | DN65 | 2.2 | 4.0 | 4.75 | |||
| DN32 | 1.8 | 2.5 | 4.25 | 5.0 | |||
| 2.0 | 2.75 | DN125 | 2.5 | DN200 | 5.5 | ||
| 2.2 | 3.0 | 2.75 | DN200 | 5.75 | |||
| 2.5 | 3.25 | 3.0 | DN200 | 6.0 | |||
| 2.75 | 3.5 | 3.25 | |||||
| 3.0 | 3.75 | 3.5 | |||||
| 3.25 | 3.75 | ||||||
| 4.0 |
Galvanized steel pipe thread connection method
Procedure for threaded connection of galvanized pipe: measuring length → cutting → threading → winding packing → connection.
First, the calculation of the length of the pipe 1, the calculation of the thread connection: As shown in Figure 4-2, we refer to the length between the center line of the two pipe (or valve) as the construction length (L1), the pipe in the pipe section The actual length is called the blanking length (S). During the pipe joining process, when the length of the pipe to be joined is less than 6 meters (the length of the galvanized pipe sold on the market is 6 meters), it is necessary to carry out the actual pipe. Estimation of material length.
