316L stainless steel welded pipe

316L stainless steel welded pipe material is the basis to determine the quality of stainless steel pipe, 316L stainless steel welded pipe corrosion resistance is the best, stainless steel welded pipe followed by 201 stainless steel pipe material is worse than stainless steel welded pipe, stainless steel pipe is difficult to distinguish with the naked eye, so how do we identify the material of stainless steel pipe?

Magnetic test: 316L and 304 are less magnetic.

Nitric acid point test: Through the nitric acid point test to test the corrosion resistance of the substrate is the most intuitive test method, usually good stainless steel pipe in the test will only be slightly corroded, and the lowest corrosion resistance of stainless steel pipe, there will be obvious corrosion traces.

2. Stainless steel measuring liquid: also known as stainless steel tube detection liquid, the surface of the stainless steel tube to ensure that there is no stain, after grinding off the surface coating, a drop of measuring liquid in the coating, observe the color change of stainless steel in the test area, compare the color of stainless steel or the time to turn red.
3. Through the spark observation: through the spark and hardness of cutting or welding can also distinguish the quality of stainless steel pipe.