What are the causes of gluing or killing of stainless steel threaded pipe joints?

Usually small braids often deal with a variety of oil leaks in their work, but there is a problem that has been bothering me, because some of the pipe joints are stainless steel threaded pipe joints, after the oil leak, I will remove him to replace the seal, but often can not be removed, if forced to remove China, the joint of stainless steel threaded pipe often damaged, gluing or bite to death, The whole joint is scrapped. It's too troublesome to make the pipe joint welded again. Sometimes, when the thread is re-installed, the force is too small to leak oil, and the force is too big to bite. Do we have to change to the flange joint? What is the reason for the manufacturer to glue or bite the pipe joint to death? Is there any solution?

Because the stainless steel material is soft, if the tightening torque exceeds the thread, the thread tooth shape will be deformed, that is, you said the phenomenon of biting. There are several solutions.

1. If the corrosion resistance is not high enough, the material should be changed to ordinary steel.

2. Change the material of stainless steel and choose the stainless steel with higher hardness.

3. Adding raw material tape to the stainless steel threaded pipe can reduce part of the biting phenomenon, but can not be completely avoided.