How to Accurately Distinguish the Authenticity of Seamless Steel Tubes

A so-called fluid tube appears on the market. In fact, it is a processed high-frequency welded pipe. The treatment method is to scrape or wear off the original weld by special equipment, and the other is to hot-roll the welded pipe.

How to accurately distinguish the authenticity of seamless steel pipe? Methods as below:1) Anything that is shaved or worn away will leave traces, and some are still obvious, sometimes more obvious after removing the rust with tools;2) Everyone carefully observes the following, 20# steel and Q235 have different rust due to different materials;3) The manufacturers of such pipes are afraid of taking responsibility, and their quality certificates are fluid pipes and cannot be said to be seamless steel pipes for fluids;4) Merchants selling such pipes generally require a theoretical weight settlement. Everyone knows that genuine domestic seamless steel pipes are beyond the standard thickness and are generally overweight;5) There is also a flaw detection and component inspection. These two methods have limitations because the flaw detection is difficult to distinguish between hot-rolled welded pipes.

The 12Cr1MoVG seamless steel pipe is a heat-shrinkable product with a more beautiful appearance, which increases the overall performance of the steel pipe, and forms a seamless steel pipe that is consistent with the seamless steel pipe.There are several types of welded pipes commonly found in the market, such as straight welded pipes, spiral welded pipes and seamless welded pipes. However, straight welded pipes and spiral welded pipes are very well recognized. The difference between seamless welded pipes and seamless pipes can be obtained from several aspects. Look:

First, the welded pipes are generally fixed lengths and are generally 6 meters, 9 meters or 12 meters. There are very few fixed-length steel tubes, because the factory has a lot of price increases.Second, you can see from the cross section of the tube head, if there is rust, wipe him clean, if you look carefully, you will find the weld zone.Third, if it is pickled, it is most obvious.It is also worth noting that: generally thick-walled steel pipes do not have the phenomenon of welded pipe spitting, and only thin-walled steel pipes are easy to be confused, but they are also distinguishable.A. See if the wall thickness is uniform. Since the seamless steel pipe is made of round steel perforation, the wall thickness of the seamless steel pipe will generally be deviated (as the technology continues to increase, the wall thickness deviation of the seamless steel pipe becomes smaller and smaller. But there are still some, and although the welded pipe is subjected to welding rib treatment or thermal expansion, but because his raw material is strip steel, his wall thickness is very uniform.B. After the thermal expansion of the welded pipe, if you carefully observe it, you can still see the welding ribs.

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