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Product Info
The hot-dip galvanized tube is obtained by reacting a molten metal 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. The steel pipe matrix and the molten plating solution undergo complex physical and chemical reactions to form a corrosion-resistant structure of a zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe base. Therefore, its corrosion resistance is strong.
Application
At present, the iron pipe used for gas, greenhouse and heating is also a galvanized pipe. The galvanized pipe is used as a water pipe. A large amount of rust is generated in the pipe. The yellow water flowing out not only pollutes the sanitary ware, but also contains bacteria that grow on the uneven inner wall, causing corrosion in the water. The heavy metal content is too high, which seriously endangers the health of the human body. In the 1960s and 1970s, developed countries in the world began to develop new types of pipes and banned galvanized pipes. The Ministry of Construction and other four ministries and commissions also issued a document clarifying that galvanized pipes will be banned from 2000. At present, galvanized pipes are rarely used in cold water pipes in new residential areas. Some districts use galvanized pipes for hot water pipes.
Technology Requirement
1, brand and chemical composition
The grade and chemical composition of the steel for galvanized steel pipe shall comply with the grade and chemical composition of the steel for black pipe specified in GB 3092.
2, manufacturing methods
The manufacturing method of the black tube (furnace welding or electric welding) is selected by the manufacturer. Galvanizing is performed by hot dip galvanizing.
3, thread and pipe joints
3.1 Galvanized steel pipes with thread delivery, thread should be made after galvanizing. Threads shall comply with the provisions of YB 822.
3.2 Steel pipe joints shall comply with the provisions of YB 238; malleable cast iron pipe joints shall comply with the provisions of YB 230.
4. Mechanical properties The mechanical properties of steel pipes before galvanizing shall comply with the provisions of GB 3092.
5. Uniformity of galvanized layer The galvanized steel pipe shall be tested for the uniformity of the galvanized layer. The steel pipe sample shall not be reddened (copper plating) by continuously immersing it in the copper sulfate solution for 5 times.
6. Cold bending test The galvanized steel pipe with a nominal diameter of not more than 50mm shall be tested for cold bending. The bending angle is 90° and the bending radius is 8 times the outer diameter. The test shall be carried out without filler and the weld of the specimen shall be placed on the outside or the upper part of the bending direction. After the test, there should be no cracks in the sample and the same phenomenon as the zinc layer peeling off.
7. Hydrostatic test The hydrostatic test shall be carried out in a black tube, or an eddy current test may be used instead of a hydrostatic test. The test pressure or eddy current test comparison sample size should meet the requirements of GB 3092.
The mechanical properties of steel are important indicators to ensure the ultimate performance (mechanical properties) of steel, which depends on the chemical composition of the steel and the heat treatment system. In the steel pipe standard, tensile properties (tensile strength, yield strength or yield point, elongation), hardness and toughness indexes, and high and low temperature properties required by users are specified according to different use requirements.
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