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Technical Requirements For Hot Dipped Galvanized Steel Pipe

TF Sources Co.,Limited | Updated: Sep 19, 2018
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1. grade and chemical composition

The grade and chemical composition of steel for galvanized steel pipe shall conform to the grade and chemical composition of the black pipe steel as specified in GB 3092.

2. Manufacturing method

The manufacturing method of the clarinet (furnace welding or welding) is selected by the manufacturer. Galvanized by Hot dip galvanizing method.

3, threaded and pipe fittings 3.1 Galvanized steel pipe with threaded delivery, thread should be made after galvanizing.

The thread shall conform to the provisions of YB 822.

3.2 Steel pipe fittings shall conform to the provisions of YB 238, malleable cast iron fittings shall conform to the provisions of YB 230.

4, mechanical properties of steel pipe before galvanizing mechanical properties should comply with the requirements of GB 3092.

5, galvanized coating uniformity of galvanized steel pipe should be used as a test of the uniformity of the galvanized layer.

The steel tube specimen is continuously dipped in copper sulfate solution for 5 times not to turn red (brass plated).

6, cold bending test nominal diameter of less than 50mm of galvanized steel pipe should be used for cold bending test. The bending angle is 90° and the bending radius is 8 times times the outer diameter. The specimen weld should be placed on the outside or the upper part of the bending direction without the filler material at the test.

After the test, there should be no cracks on the specimen and the same image of the zinc layer peeling.

7, hydrostatic test should be carried out in the clarinet, but also use Eddy current testing instead of hydrostatic test. Test pressure or eddy current testing comparison specimen size should be in accordance with the requirements of GB 3092.


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