When consumers buy stainless steel welded pipes, they usually worry about buying inferior stainless steel welded pipes. We will simply introduce how to identify inferior stainless steel welded pipes.
1, stainless steel welded pipe folding
Shoddy welded stainless steel pipes are easy to fold. Folding is a variety of broken lines formed on the surface of stainless steel pipes.This defect often runs through the longitudinal side of the whole product.The reason for the formation of folding is because the shoddy manufacturers are too pursuit of high efficiency, the amount of pressure is too large, resulting in the formation of ear in the pipe, the next rolling will form folding, folding products will crack after bending, the strength of stainless steel pipe will decrease significantly.The appearance of shoddy welded stainless steel pipes will have pockmarked phenomenon.The pitted surface is an irregular and uneven defect of stainless steel due to severe rolling groove wear.
2, stainless steel welded pipe scar
The surface of inferior stainless steel welded pipe is easy to scar, the formation of two main reasons, one is the inferior stainless steel welded pipe material is not uniform and impurities. Another is the shoddy stainless steel welding pipe factory guide sanitation equipment is simple, easy to stick steel, these impurities bite into the roll is easy to form scars.
3, stainless steel welded pipe cracks
The surface of shoddy stainless steel welding pipe is also easy to form cracks, because the billet is adobe, the porosity of adobe is very much, the adobe in the process of cooling because of the effect of thermal stress, the formation of cracks, after rolling will have cracks.
4, stainless steel welded pipe surface
There is no metal luster on the surface of inferior stainless steel welded pipe, which will show light red or similar color to pig iron. There are two reasons for the formation. One is that the blank is adobe. The other is that the rolling temperature of fake and inferior pipes is not standard. The steel temperature is measured visually, so it can not be rolled according to the prescribed austenitic area, and the performance of stainless steel pipes can not reach the standard naturally.
Shoddy stainless steel welded pipe is also easy to be scratched, because shoddy stainless steel welded pipe manufacturers have simple production equipment, easy to form burrs, scratch the steel surface, depth scratch will also weaken the strength of stainless steel pipe.
The transverse bar of shoddy stainless steel welded pipe is thin and low, which often produces the phenomenon of dissatisfaction. Because the manufacturer is trying to achieve a large negative tolerance, the pressure of the first few passes of the finished product is too large, the iron shape is too small, and the pass shape is not enough.
The cross section of the shoddy welded stainless steel pipe is oval, which is because the manufacturer in order to save materials, the pressure of the first two rolls of the finished product is too large.
Post time: Mar-20-2023
