Application of 304 stainless steel pipe in petrochemical field The use of stainless steel in the petrochemical field mainly includes: stainless steel plate for storage tank and heat exchanger casing; stainless steel composite plate for reactor and tower casing; used for furnace tube and material transportation Stainless steel tube of heat exchanger tube; stainless steel forgings, stainless steel tower internals, etc. The requirements of the petrochemical industry for stainless steel are mainly corrosion resistance, including chloride, sulfide and other salt corrosion; high temperature and low temperature resistance. Stainless steel used for crude oil exploration and development requires resistance to carbon dioxide and hydrogen sulfide corrosion. In the selection of varieties, generally based on 304, the thickness of the steel plate is generally 6-22 mm, mainly used to build polymer storage tanks, heat exchanger shells. In addition, some reactor tower internals use 316L, TP347, etc., and have a thickness of 2-6 mm. For liquid vehicles (train tankers) that transport glacial acetic acid, 304 and 316 steel sheets are generally used.
For urea plants, 316L is generally used. At present, the annual usage of stainless steel in China's petrochemical industry is about 70,000 tons, including 10,000 tons of stainless steel plate (8 mm or more), 15,000 tons of stainless steel composite plate, 40,000 tons of stainless steel seamless pipe and 5,000 tons of stainless steel welded pipe.
At present, domestic stainless steel is not widely used in the petrochemical field. The main reason is that domestic enterprises have not yet formed a standard system to meet the development needs of China's petrochemical industry; plates, pipes, forgings and welding materials are not matched, and the production distance of stainless steel pipes is not matched; the petrochemical industry needs The production capacity of medium-thick wide-plate, large-diameter and thick-walled steel pipes is very limited; the quality of stainless steel pipe products is unstable; the development and production of new varieties cannot meet the development of petrochemical industry. Due to the limitations of stainless steel varieties, quality and specifications in China, many of the stainless steels required by the petrochemical industry cannot be provided. For example, a wide and thick plate with a width of 4 meters cannot be produced in China. Therefore, many stainless steels are imported in the form of equipment. In addition, domestic enterprises have gaps in product development compared with foreign companies. For example, some stainless steel companies in Europe have launched more than a dozen new stainless steel products every year, and Chinese companies are still not enough in this area.
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