Nowadays, there are many manufacturers of stainless steel heat exchange tubes, so the quality is hard to distinguish. We cannot be sure that the stainless steel heat exchange tubes we buy are of qualified quality. Therefore, in order to protect our own rights and interests, Mingxin Stainless Steel will teach you how to make simple Identify inferior stainless steel heat exchange tubes.
Shoddy stainless steel heat exchange tubes mainly have the following characteristics:
1) The surface of inferior pipes has no metallic luster, and is generally light red or similar to pig iron.
2) The surface of inferior pipes is easy to scratch. This is because poor-quality pipe manufacturers have poor equipment and unscrupulous production processes, which are prone to burrs and scratches on the surface.
3) Inferior pipes have thin and low transverse ribs on the surface, which is prone to insufficient filling, because in order to achieve a large negative tolerance, the manufacturer has too much reduction in the first few passes of the finished product, the iron shape is too small, and the hole shape is not full.
4) The cross-section of inferior pipes is oval. This is because in order to save materials, the reduction amount of the first two passes of the finished roll is too large, the strength of this seamless steel pipe is greatly reduced, and it does not meet the standard for the shape and size of the pipe fittings.
5) Inferior pipe materials contain many impurities. The density of stainless steel is relatively small, and the size is seriously out of tolerance.
We can judge the quality of stainless steel heat exchange tubes through the above aspects.