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The Development History And Production Process Of Galvanized Steel Jun 19, 2017

     Often used galvanized pipe, galvanized pipe use now gas, heating with the kind of iron pipe is also galvanized pipe, galvanized pipe as a water pipe, use a few years later, the tube produces a lot of rust, the outflow of yellow water is not only pollution Sanitary ware, and mixed with non-smooth inner wall of the bacteria, rust caused by heavy metal content in water is too high, serious harm to human health. Galvanized pipe production process, with the following production steps:

A. Round steel ready; b. Heating; c. Hot rolling perforation; d. Cut the head; Pickling; f. Grinding; g. Lubrication; Cold rolling; i. Degreasing Solution heat treatment; k. Straightening Cut; Pickling; Product testing. Galvanized Steel

    Galvanized pipe should meet the technical requirements: 1, grades and chemical composition, galvanized steel pipe grades and chemical composition should be consistent with GB 3092 of the black tube steel grades and chemical composition. 2, manufacturing methods: black tube manufacturing methods (furnace welding or welding) selected by the manufacturer. Galvanized by hot dip galvanizing method. 3, thread and pipe joints a: with the delivery of galvanized steel pipe, the thread should be in the galvanized car system. The thread should be in accordance with YB 822. B: steel pipe joints should be consistent with the provisions of YB 238; malleable cast iron pipe joints should be consistent with the provisions of YB 230 4, mechanical properties of steel pipe galvanized before the mechanical properties should be consistent with the provisions of GB 3092. 5, galvanized layer uniformity galvanized steel pipe should be galvanized layer uniformity test. Steel samples in the copper sulfate solution for 5 times can not be red (copper). 6, cold bending test Nominal diameter of not more than 50mm galvanized steel pipe should be cold bending test. Galvanized Steel

    The bending angle is 90 ° and the bending radius is 8 times the outer diameter. The test shall be filled with no filler, and the specimen shall be placed in the outer or upper part of the bending direction. After the test, there should be no cracks and cracks on the sample. 7, hydraulic pressure test should be carried out in the black tube, eddy current can also be used instead of hydraulic test. Test pressure or eddy current testing Contrast sample size should be in accordance with GB 3092. The mechanical properties of steel are important indicators to ensure the ultimate use of steel (mechanical properties), which depends on the chemical composition of steel and heat treatment system. In the steel pipe standard, according to the different requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness indicators, as well as the user requirements of high and low temperature performance.Galvanized Steel