202 stainless steel is one of the 200 series stainless steel, the national standard model is 1Cr18Mn8Ni5N. The 200 series stainless steel is a low nickel high manganese steel with a nickel content and a manganese content of about 8%. It is nickel-nickel stainless steel. 202 is the American sign, instead of 1Cr18Ni9. Austenitic stainless steels are characterized by high phase transition temperatures and can therefore be used as heat-resistant steels.

In order to make the austenitic stainless steel phase change, it must be heated to above 1000 °C, and at 350 °C, the metallographic structure does not change, that is, the performance of the steel does not change fundamentally. It will only swell due to heat, but it will not change much. Under normal circumstances, it can be neglected. For this reason, 202 stainless steel has good high-temperature resistance.

It is this performance, 202 stainless steel is widely used in architectural decoration, municipal engineering, highway guardrails, hotel facilities, shopping malls, glass handrails, public facilities, and other places. It is made of high-precision automatic pipe-making equipment, which is formed by self-etching and welding, rolled and formed, and filled with gas protection (inside and outside the pipe) without any metal filler. The welding method is TIG process and online solid solution eddy current flaw detection.