The main source of Chinese stainless steel
The nickel and chromium resources used to smelt stainless steel in China are scarce. In the past, the application of stainless steel in China was far less extensive than it is now. The output of stainless steel is also small and the self-sufficiency rate is less than 30%. It mainly depends on imports. The contradiction between the supply and demand of resources such as nickel and chromium has become increasingly prominent. In my country, stainless steel scrap is even more in short supply, and there is not much stainless steel scrap that can be recycled every year. Second, stainless steel has a long service life and will not be scrapped in several years or even decades. Therefore, there is less stainless steel scrap. Therefore, a large part of my country’s stainless steel scrap depends on imports.
The classification of waste stainless steel is closely related to the use of stainless steel, mainly from the following sources:
1. Domestic waste:
Scrap stainless steel appliances used in daily life (old materials), most of the scrap stainless steel imported from Japan and South Korea belong to this category, and can only be used as furnace materials. For kitchen equipment and tableware, the main steel grades are SUS304 and 430. The food processing industry mainly manufactures food processing machinery and containers, such as grain, beer and beverage, dairy processing equipment, and quick-freezing refrigeration equipment. The main steel grades are 304, 321, 1Cr13 and antibacterial ferritic stainless steel. spring
2. Industrial waste
The leftover materials (new materials) cut and stamped in the industrial production process include some directly usable tubes, rods, plates, etc., and the quantity is small. Urban landscape engineering is mainly based on stainless steel welded pipes. The automobile industry is mainly ferritic stainless steel 409 for automobile exhaust pipes. Other industries such as urban water supply engineering, environmental protection and petrochemical, and electric power industries also produce a lot of waste stainless steel. Pumps and containers for oil, gas, and acid are a big market that produces a large amount of waste stainless steel tanks, pipes, pumps, and valves. The main steel grade is 18/8 stainless steel spring.
Due to the wide variety and specifications of stainless steel scrap, it is necessary to strengthen the management of the sorting, processing and storage of various alloy scraps