I. Youfa Galvanized Pipe
Youfa galvanized pipe is divided into two types: hot galvanizing and electro-galvanizing. Thick hot dip galvanized coating, uniform coating, strong adhesion and long service life. The cost of galvanizing is low, the surface is not very smooth, and the corrosion resistance is much worse than that of hot galvanized pipe.
Youfa galvanized pipe is an alloy layer produced by the reaction between molten metal and iron matrix, which combines the matrix with the coating. The galvanized pipes produced by Youfa Group are mainly hot dip galvanized. Hot dip galvanizing is to pickle the steel pipe first. In order to remove iron oxide from the surface of steel pipe, after pickling, it is cleaned in the tank with ammonium chloride or zinc chloride aqueous solution or mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to the hot-dip galvanizing tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
Second, the price of Youfa galvanized pipe
1. The current price of 4 *2.5 Youfa galvanized pipe of Shenyang Jin Ao Materials Co., Ltd. is RMB ￥2500/kg.
2. The starting price of Youfa galvanized pipe under Tianjin Chunyuan Iron and Steel Trading Co., Ltd. is RMB1980/kg.
(Price source network, for reference only)
Third, the technical requirements
1, brand and chemical composition
The brand and chemical composition of steel for Youfa galvanized pipe should meet GB? Grade and chemical composition of steel for black pipes specified in 3092.
2. Manufacturing method
The manufacturing method of black pipe (furnace welding or electric welding) is selected by the manufacturer. Galvanizing adopts hot dip galvanizing method.
3. Threads and pipe joints
(1) When transporting galvanized steel pipes with threads, the threads should be turned after galvanizing. Thread shall conform to YB? The provisions of 822.
(2) Steel pipe joints shall conform to YB? 238; Malleable cast iron pipe fittings shall conform to YB? The provisions of 230.
4. Mechanical properties The mechanical properties of steel pipes before galvanizing should meet GB? The provisions of 3092.
5. Uniformity of galvanized layer Galvanized steel pipes shall be tested for uniformity of galvanized layer. The steel pipe sample does not strain red (copper plating color) after being soaked in copper sulfate solution for 5 times continuously.
6, cold bending test nominal diameter is not more than 50mm galvanized steel pipe should be cold bending test. The bending angle is 90, and the bending radius is 8 times of the outer diameter. There is no filler in the test, and the weld of the sample should be placed on the outside or upper part of the bending direction. After the test, there should be no cracks and zinc peeling on the sample.
7. Hydrostatic test Hydrostatic test should be carried out in a black pipe, and eddy current flaw detection can also be used instead of hydrostatic test. Test pressure or eddy current flaw detection contrast sample size should comply with GB? The provisions of 3092. The mechanical properties of steel are an important index to ensure the final use performance (mechanical properties) of steel, which depends on the chemical composition and heat treatment system of steel. In the steel pipe standard, tensile properties (tensile strength, yield strength or yield point, elongation), hardness and toughness indexes, as well as high and low temperature properties required by users are specified according to different application requirements.
? The price of Youfa galvanized pipe is mainly influenced by manufacturers and brands, and its products have their own advantages. The service life of hot dip galvanizing is excellent, but the cost is high, and the cost of electro-galvanizing is low, but the quality is slightly inferior. You also need to refer to the brand, chemical composition, hardness and toughness index when purchasing. For example, refer to the water pressure test to screen out suitable products to ensure compliance with GB? 3092 stipulates the use of galvanized pipes made by friends. Tubatu Online provides you with "every decoration quotation, 1-4 local decoration companies, 3 sets of decoration design schemes" and the decoration pit avoidance strategy for free! Click this link:/Zhu Ye /zxbj-cszy.php? to8to _ from = SEO _ zhidao _ m _ jiare & amp； Wb, you can get it for free ~