The 200 series stainless steel was first developed successfully in the United States during World War II as a substitute for the 300 series stainless steel. At that time, due to the war, nickel as a strategic material was strictly controlled by the relevant countries, and the supply of nickel in the United States was seriously insufficient. In order to solve the problem of production and supply of stainless steel in the case of serious shortage of nickel supply, the United States has developed this new series of austenitic stainless steel with manganese instead of nickel.
After the end of World War II, the supply situation of nickel in the United States gradually improved, therefore, the production of 300 series stainless steel is no longer restricted by the shortage of raw materials, so the 200 series has not been greatly developed. Several Indians who had participated in the development of 200 series stainless steel returned to India, starting from the situation that India is relatively rich in manganese resources and lack of nickel resources, the 200 series stainless steel varieties developed in Foshan Stainless Steel in the United States were brought back to India, resulting in the historical phenomenon of development in the United States and results in India.
At present, the world's main stainless steel production and consumption countries have about the 200 series of stainless steel standards. Among them, the United States standard is the most complete, a total of 16 200 series of stainless steel standards.
2, 200 series austenitic stainless steel typical application range:
Because of its good malleability and rust resistance, it can be used in the following aspects:
1. Public catering industry and food processing:
2. Durable consumer goods
3. Architecture
4. Cars, railways and transportation
3, 200 series austenitic stainless steel technical performance
200 series austenitic stainless steel has good strength, plastic properties and rust resistance. The JSLAUS (202) can be used for particularly deep drawing products, while the J4 (201) can be used for deep drawing products.
These steel grades have been frequently tested in India and other countries and proved to be as resistant to rust as 304 under mild conditions. Rust resistance and physical testing prove that the 200 series is suitable for a variety of applications, but J4 (201) cannot be used in coastal areas and moderate to heavy rain environments, and the 200 series is not recommended for storage/processing of acidic/corrosive chemicals.
4, 200 series austenitic stainless steel production process:
Scrap steel and iron alloys are melted in the arc furnace, and then into AOD, VOD furnace secondary refining, molten steel in the continuous casting machine into billets, billets rolled into steel strip, after the rolling mill processing, continuous annealing and electrolytic pickling, surface rolling, polishing, cold rolling material treatment into different surfaces, there are No.1,2D,2B,No.3,No.4 and so on.
Standard number: GB/T18704-2002
Standard name: stainless steel composite pipe
Standard status: Current
Implementation date: 2002-10-1
Promulgated by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Description: This standard specifies the classification, code, size, shape, quality and allowable deviation of stainless steel composite pipe, technical requirements, test methods, inspection rules, marking, labeling, packaging and storage. This standard is applicable to municipal facilities, vehicle and ship manufacturing, road and bridge guardrail, building decoration, steel structure grid, medical equipment, furniture, general mechanical structure components and other stainless steel composite pipe.
