How to detect the material of stainless steel wire mesh?

1. Identify whether the words "304 or 0Cr 18Ni9" are printed on the surface of the pipeline, and ask for the quality certificate and quality guarantee from the manufacturer.

Certificate.

2、

Tested with acid reagent, after 30 seconds, 304 stainless steel products did not change color, and 20 1 stainless steel products turned black.

3. Observe whether the color of the outer surface such as the inner wall of the stainless steel pipe is bright and smooth, whether the thickness is uniform and whether it is rough.

4, can pass the spectral test.