Stainless steel tubes have now been purchased and used by customers due to their smooth and high-quality appearance. Since they are highly favored by consumers, some manufacturers have seized on the psychological state of consumers’ carelessness to substitute inferior products. Therefore, when purchasing, everyone must be optimistic and do not buy inferior products. Below, we will tell you how to choose to purchase.
1、 Observe whether the color of the outer surface and the inner wall of the tube is bright and smooth, and whether the thickness is uniform or rough. Generally, there is no need to inspect welded pipes, while seamless steel pipes are produced by cold drawing or hot rolling. Improper operation during the production process can easily lead to uneven thickness, cracks on the pipe surface, and other phenomena. However, rough surface is generally due to the lack of polishing treatment for seamless pipes, which does not affect their use if there are no special requirements for appearance.
2、 When purchasing, excellent products with quality and technical evaluation should be selected. Long term use of witnesses and good word of mouth among customers is the most direct and effective purchasing method.
3、 Before selecting stainless steel pipes, it is necessary to consider the purpose and environment of the stainless steel pipes. For example, welded pipes are commonly used for decoration, seamless pipes are commonly used for fluid delivery, sanitary grade stainless steel pipes are used for medical or kitchen purposes, and thick wall pipes are used for pressure purposes. Generally, 200 series materials can be used indoors, 304 or other materials need to be used outdoors, and 316 or more materials are generally used in acid and alkaline areas or coastal areas.
Generally, the quality of welded stainless steel tubes is superior to seamless stainless steel tubes, as welded stainless steel tubes are made of accurately cold rolled sheets that have been tested, and any defects are limited to the weld. Seamless pipes are made of stainless steel billets by stamping, resulting in many tearing phenomena in the pipe wall formed by extrusion. Eddy current testing shows that the defect rate of welded stainless steel tubes is generally lower than that of seamless stainless steel tubes. Using ultrasonic testing, it is difficult to detect defects in seamless stainless steel pipes due to their high background noise. However, the background noise of slotted stainless steel tubes is very low, making it easy to find defects.
Generally, we will understand the use of stainless steel pipes based on their model and specifications before using them. We should also fully understand the difference between seamed and seamless pipes, and do a good job of post processing and using them.