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Method for distinguishing inferior stainless steel pipes

Due to the excellent performance of seamless stainless steel pipes, the use is very popular and the price is very reasonable. Therefore, in the downstream spot market, there are counterfeit and seamless stainless steel pipes, which are fluid pipes. In fact, this pipe is treated high. Frequency welded pipe.
The treatment method of the high-frequency welded pipe is to scrape or wear off the original weld by special equipment. Another method is to hot-roll the welded pipe. Some unscrupulous merchants use this kind of pipe to deceive the purchaser.
Let’s talk about the characteristics of this pipe. First of all, if it is shaved or worn away, it will leave traces. Some of them are obvious. Sometimes it is more obvious after removing the rust with tools. The manufacturers of such pipes are marked with the quality certificate because they are afraid of taking responsibility. Fluid pipes instead of seamless steel pipes for labeling fluids; merchants selling such pipes usually have to settle according to the theoretical weight, but the real domestic seamless steel pipes are beyond the standard thickness, generally overweight; there is a more professional, That is to do the flaw detection and component inspection, but these two methods are more limited, because the flaw detection is difficult to identify the hot-rolled welded pipe.
The seamless stainless steel pipe is heat-shrinked and the appearance is also more beautiful, so that the overall performance of the stainless steel pipe can be increased.
Commonly used welded pipes in the market mainly include straight seam welded pipes, spiral welded pipes and seamless welded pipes, but straight seam welded pipes and spiral welded pipes are very well recognized. The difference between seamless welded pipes and seamless pipes is mainly reflected in the following aspects.
First, the welded pipe is usually fixed length and is usually 6 meters, 9 meters or 12 meters. There are very few fixed-length steel pipes, because the factory has a lot of price increases.
Secondly, from the cross section of the stainless steel pipe head, if there is rust, wipe it clean and look carefully to find the weld zone. And if it is pickled, it will be more obvious.
In addition, it should be noted that the general thick-walled steel pipe does not have the phenomenon of welded pipe spitting, and only the thin-walled steel pipe is easy to be confused, but it is also distinguishable. It can be observed whether the wall thickness of the stainless steel pipe is uniform, because the seamless steel pipe is made of round steel perforation, so the wall thickness of the seamless steel pipe usually varies, and the welded pipe is processed by welding or thermal expansion, but because of its The raw material is stainless steel strip, so the wall thickness of the welded pipe is very uniform.
Source: China Stainless Steel Pipes Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)

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