Application of Galvanized Pipe
In order to improve the corrosion resistance of steel pipes, galvanizing of common steel pipes is stopped. Galvanized steel pipes are divided into hot-dip galvanizing and electro-galvanizing. Hot-dip galvanizing has thick galvanizing layer, low galvanizing cost and poor lubrication in appearance. Oxygen-blowing welded pipe: used as steel-making oxygen-blowing pipe, commonly used small-caliber welded pipe, specifications from 3/8-2 inch eight. In order to prevent corrosion, some steel strips made of 08, 10, 15, 20 or 195-Q235 should stop aluminizing.
Most of the old houses used galvanized pipes. Now the kind of iron pipes used for gas and heating are galvanized pipes. Galvanized pipes are used as water pipes. After several years of application, a large number of rust scales are produced in the pipes. The yellow water not only pollutes the sanitary ware, but also contains bacteria that grow on the non-lubricating inner wall. The heavy metal content in the rust water is too high, which seriously endangers the health of the human body. In the 1960s and 1970s, the prosperous countries in the world began to develop new types of pipes, and gradually banned galvanized pipes. Four ministries such as the Ministry of Establishment of China have also banned galvanized pipes since 2000. At present, galvanized pipes were seldom used in cold pipes of newly built residential areas, and galvanized pipes were used in hot pipes of some residential areas.
Editing the Weight Coefficient of Galvanized Steel Pipe in this Section
公称壁厚mm 2.0 2.5 2.8 3.2 3.5 3.8 4.0 4.5
Nominal wall thickness mm 2.02.52.8 184.108.40.206 4.04.5
系数c 1.064 1.051 1.045 1.040 1.036 1.034 1.032 1.028
Coefficient C 1.064 1.051 1.045 1.040 1.036 1.034 1.032 1.028
The mechanical properties of steel injection is an important index to ensure the ultimate performance (mechanical properties) of steel, which depends on the chemical composition and heat treatment system of steel。 In the steel pipe specification, according to different application requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness index, as well as the high and low temperature properties requested by users are regulated。 Steel grades: Q215A; Q215B; Q235A; Q235B
The experimental pressure/Mpa: D10。2-168。3mm is 3Mpa; D177。8-323。9mm is 5Mpa。
Edit the classification of galvanized tubes in this section
Galvanized steel pipes are divided into cold-plated pipes and hot-plated pipes. The former has been banned, while the latter has been advocated for temporary use by the state.
Hot dip galvanized pipe
It is to make the molten metal react with the iron matrix to produce the alloy layer, so that the matrix and the coating can be separated from each other. Hot-dip galvanizing is to stop pickling the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is stopped cleaning in the tank of ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution, and then sent into the hot-dip galvanizing bath. Hot dip galvanizing has the advantages of average coating, strong adhesion and long service life.
Cold galvanized pipe
Cold galvanizing means galvanizing. The amount of galvanizing is very small. As long as it is 10-50g/m2, its corrosion resistance is much different from that of hot galvanizing tubes. In order to ensure the quality of normal rail galvanized pipe manufacturers, most of them do not use galvanized (cold plating). As long as those small enterprises with small scope and obsolete equipment adopt galvanizing, of course, their prices are relatively cheap. At present, the Ministry of Establishment has officially eliminated the backward technology of cold galvanized pipes. In the future, cold galvanized pipes are not allowed to be used as water and gas pipes.
Hot-dip galvanized steel pipe
The complex physical and chemical reactions occur between the steel tube matrix and the molten plating solution, forming a zinc-iron alloy layer with a tight corrosion resistance structure。 The alloy layer is integrated with pure zinc layer and steel tube matrix。 Therefore, its corrosion resistance can be strong。
Cold Galvanized Steel Pipe
Zinc layer is an electroplating layer, and zinc layer is separately stratified from the steel tube matrix。 The zinc layer is thin, and the zinc layer simply adheres to the steel tube matrix, which is easy to fall off。 Therefore, its corrosion resistance is poor。 In newly built residential buildings, the use of cold galvanized steel pipes as water supply pipes is prohibited。
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