How to Detect High Quality Coating Steel Pipe
In addition to the appropriate room temperature range, but also in accordance with the relevant national standards, the impact of its operation, in order to see the changes in the coating.
2. Visual inspection
This is the best way to look at coated steel tubes. On the appearance of steel pipe should be what kind of standards, the relevant state laws are provided.
If you are not allowed to buy their own coated steel pipe is good goods, may wish to ask the store to bend test. In accordance with the provisions of qualified coating steel pipe, bending angle should be about thirty, and the room temperature should be controlled in a certain range, too high or too low, are not up to the detection standard.
4. Pinhole test
Pipe coating length of about 1000mm, with the EDM leak detector on the test tube under the specified test voltage, the coating thickness of not more than 0.4mm, the test voltage of 1500V, coating thickness greater than 0.4mm, the test voltage of 2000V The Check the presence or absence of spark, the test results should be consistent with the provisions of 5.5.
5. Adhesion test
The adhesion test shall be carried out in accordance with CJ / T 120-2008 and the test results shall comply with the requirements.
6. Flatten test
DN> 50 mm coated steel pipe for flattening test. The length of the test piece is (50 ± 10) mm. At a temperature of (20 ± 5) ° C, the test pieces were placed between the two plates and were gradually compressed on the pressure tester to a distance of two fifths of the outer diameter of the test piece. The pipe weld is perpendicular to the load application direction. After the test, check the coating, the test results should be consistent with the provisions.
Hunan Great Steel Pipe Co.,Ltd: http://www.great-pipe.com/
Address: Hunan Steel Industrial Zone,No.9 Xiangfu Road, Yuhua District, Changsha, Hunan, China
coating steel pipe: http://www.great-pipe.com/techinfo/Pipe-Coating.html
Hunan Great Steel Pipe Co.,Ltd is a world-class production and service provider of submerged arc straight seam welded pipe as the first subsidiary of Shinestar Group. Hunan Great Steel Pipe Co.,Ltd pays more attention to in the pipeline engineering research areas as a pioneer of China Petroleum Pipeline & Gas Pipeline Science Research Institute, Such as: the use of oil and gas pipelines, pipe welding technology innovation, high-end plumbing materials research and development, as well as special tools technological innovation pipeline construction, pipeline corrosion protection science and technology research, science and technology research pipeline non-destructive testing, pipeline quality assessment, and research pipeline standards and so on. In the future, we will try to use new technology to create new business value and to contribute to research and product development for the pipeline.
Hunan Steel Industrial Zone,No.9 Xiangfu Road, Yuhua District, Changsha, Hunan, China
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