In China, stainless steel resources are even more scarce, and every year, there are hardly any waste stainless steel that can be recycled. Due to the long service life of stainless steel, it will not be scrapped for several years or even decades. Therefore, the amount of scrap steel recycling has decreased. Therefore, a large part of China's waste stainless steel recycling relies on imports.

The nickel and chromium resources used for smelting stainless steel in our country are scarce. In the past, the application field of stainless steel in our country was far less extensive than now, and the self-sufficiency rate of stainless steel production was less than 30%. Stainless steel still relies mainly on imports, and the amount of stainless steel waste generated each year is small, resulting in some imbalances in factors. The supply-demand contradiction between stainless steel scrap and resources such as nickel and chromium is becoming increasingly prominent. The classification of waste stainless steel is closely related to its use