Choose to buy stainless steel pipes:
1. Identify whether the steel stamped material "304" is printed on the surface of the pipe, and obtain the stainless steel pipe manufacturer's quality certificate and quality assurance certificate.
2. Test with acidic reagent, after 30 seconds, material 304 will not change color, and 201 will turn black.
3. Observe whether the color of the outer surface of the stainless steel pipe and the inner wall of the pipe is bright and smooth, the thickness is uniform, or there is roughness.
4. When choosing stainless steel pipes, you should choose famous-brand products above the provincial level assessed by the Quality and Technical Supervision Bureau. Long-term use testimony and good reputation among customers are the most direct and effective purchasing methods.