Views: 9 Author: Site Editor Publish Time: 2018-05-21 Origin: Site
1. the false and inferior thick wall seamless steel pipe is easy to fold up. Folding is a variety of broken lines formed on the surface of thick walled seamless steel tubes, which often run through the longitudinal direction of the entire product. The reason for the folding is due to the high efficiency of the fake and inferior manufacturers, the big pressure, the ear, the folding when the next rolling is rolled, the folded product will crack after the bending, and the strength of the thick wall seamless steel pipe drops greatly.
2. the appearance of the shoddy thick walled seamless steel pipe often has a phenomenon of pitting. Because of the serious wear of the groove, the surface of the thick wall seamless steel pipe is irregular and uneven. Because the manufacturers of fake and inferior thick walled seamless steel tubes have to pursue profits, rolling groove rolling often exceeds the standard.
3. the surface of the shoddy thick wall seamless steel tube is easy to produce scars. There are two reasons for this: 1. the material of the shoddy and thick wall seamless steel pipe is uneven, and there are many impurities. 2. Counterfeit and inferior materials manufacturers are weak in guiding equipment and easy to stick to steel. These impurities tend to produce scars after biting the roller.
4. the surface of the fake and inferior material is easy to crack. The reason is that the billet is the billet and the air hole is many. In the process of cooling, the cracks are caused by the thermal stress. After rolling, there are cracks.
5. the shoddy and thick wall seamless steel pipe is easy to scratch. The reason is that the equipment of the fake and inferior material factories is simple and easy to burr, and the surface of the thick wall seamless steel tube is scratched. Deep scraping reduces the strength of thick wall seamless steel pipe.