Annealing is a heat treatment process of stainless steel welded pipe, its purpose is to eliminate the residual stress, dimensional stability, reduce distortion and cracking tendency. Light with the naked eye indistinguishable from there annealed stainless steel pipe, so it can take a few ways to help you identify. 1, stainless steel pipe can be used to determine the echo. With a slightly larger force percussion stainless steel pipe, stainless steel welded pipe Fuer listen to the echo of the mouth, if the echo sound is high and relatively sharp, then has been annealed. So why would produce higher echo it? It is due to the interior crystal annealing more uniform density caused. No defect annealing inside the organization will be more, will absorb most of the acoustic energy, it echoes in stainless steel welded pipe mouth is relatively small. If the conditions can be detected by sonar. 2, with good precision digital multimeter, measure each stainless steel industrial pipe unit length (eg 2 meters) resistance. Resistance of stainless steel is relatively large, the resistance after annealing without annealing smaller than. Before the test can not have liquid residues on it. Not all manufacturers of stainless steel pipe will have been annealing this process, so you want to learn how to use the above method to distinguish annealed and non-annealed stainless steel pipe stainless steel pipe, which allows you to avoid buying shoddy in the purchase process products. 

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