What are the reasons for the cracking of stainless steel blind flanges？

　　The leakage of stainless steel blind flange was analyzed during the test of new pipeline pressure, and the main reason for the leakage was due to the further expansion of the burial cracks in the blind flanges under the effect of the test pressure until the blind flange cracked. And what is the cause of the burial crack inside the blind flange? After the experiment, it is found that there are many non-metallic inclusions in the forging blank of the blind flange. During the forging process, the forging cracks in the tip of the inclusions are produced inside the material. Most of these cracks belong to the buried cracks. After the blind flange machine is processed and formed, some buried cracks turn into the cracks. A surface crack.

　　The ANSI B16.5 Class 300 Stainless Steel Blind Flange production plant adopts the method of grinding to eliminate surface cracks, repair welding and machining, so that even if the surface cracks are eliminated, the internal cracks still exist so that the crack growth is further aggravated until the blind flange leaks.