1. Nitrogen is added to protect stainless steel pipe during production. Generally, stainless steel pipes without nitrogen protection are easy to rust and crack. Adding nitrogen can also reduce the chance of rusting.

2. When cutting 316L stainless steel pipe, first confirm whether there is scratch on 316L stainless steel pipe, so as to check the quality of incoming materials.

3. When the 316L stainless steel pipe is bent, check whether there are impurities or foreign matters on the upper and lower dies and plates.