304 stainless steel tube is more and more used in everyone's daily life. Because it's bright and easy to wash, not easy to rust, not only the surface is beautiful, but also strong. However, the 304 stainless steel tube is not absolutely rust-free. Under what circumstances will

304 stainless steel tube is more and more used in everyone's daily life. Because it's bright and easy to wash, not easy to rust, not only the surface is beautiful, but also strong. However, the 304 stainless steel tube is not absolutely rust-free. Under what circumstances will