What are the precautions for choosing and purchasing stainless steel? What should I pay attention to when I buy stainless steel? How can I buy a good stainless steel product? Let's learn about the evaluation standard of good stainless steel products.

Stainless steel pipe quality standard requirements:

1. The product meets the requirements of GB / T 17395-2008, outer diameter: 70 ± 0.3mm, wall thickness tolerance: 2.2 ± 0.2mm, length tolerance: 4060-0 / + 5mm;

2. The bending degree meets the E3 standard (0.1% of the total bending);

3. Ovality meets NR2 (ovality is no more than 5% of allowable deviation of outer diameter);

4. Outer wall polishing RA ≤ 0.8 (or RA ≤ 0.1);

5. Pressure resistance: 4MPa; proper protection during transportation, and no scratch or damage to the external wall is allowed.

6. The inside and outside surface of stainless steel pipe is clean and free of water stains. The inside and outside of the pipe are dry. There are no straightening marks on the outer wall, and the pipe orifice is smooth without burr.