The petrochemical industry, including the fertilizer industry, has a huge demand for stainless steel pipes. This industry mainly uses stainless steel seamless pipes. The specifications include: 304, 321, 316, 316L, 347, 317L, etc., and the outer diameter is about ￠18-￠610. The wall thickness is about 6mm-50mm (generally, the medium and low pressure conveying pipes with specifications above Φ159mm are selected), and the specific application fields are: furnace pipes, material conveying pipes, heat exchanger pipes, etc. E.g:
Heat-resistant stainless steel pipes are mainly used for heat exchange and fluid transportation. The domestic market capacity is about 230,000 tons per year, and high-end demand still needs to be imported.
Duplex stainless steel pipes are mainly used in the heat exchanger and fluid pipe markets of chemicals and fertilizers. Because of their high strength, stress resistance, corrosion resistance and economy, their annual consumption is about 8,000-10,000 tons.
Stainless steel oil casing, stainless steel non-magnetic drill collars used in oilfield drilling and production, super ferritic stainless steel Cr13, Cr25 and other oil casings with high resistance to CO, CO2 and Cl- corrosion, according to rough statistical analysis, the annual consumption is 20,000 tons Above, about 50,000 to 60,000 tons will be needed every year after 3 to 5 years, and the import volume of such stainless steel pipes is still relatively large.
In addition, the potential market of the petrochemical industry is large-diameter oil cracking furnace pipes and low-temperature conveying pipes. Due to their special heat-resistance and corrosion-resistance requirements and inconvenient installation and maintenance of equipment, the equipment requires a long service life, which requires material composition control and special The heat treatment method optimizes the mechanical properties and service performance of the pipe. Another potential market is the special steel pipe for the fertilizer industry (urea, phosphate fertilizer), the main steel grades are 316Lmod and 2re69.
As an important part of the chemical industry, the petrochemical industry includes many production sectors, such as fertilizers, rubber, synthetic materials and other industries. The petrochemical industry is the basic industry of economic development and involves many aspects of the real economy.
At present, the stainless steel pipes required for the maintenance and replacement of a set of polyolefin phenol units are 99.1 tons, of which Ф108-630mm large-diameter stainless steel pipes account for 53.79%. Another example is a total of 2018.5 tons of process pipelines, heat exchanger pipes, “urea grade” special pipes, duplex stainless steel pipes and various other steel pipes required for a set of 520,000 tons of urea and 300,000 tons of synthetic ammonia large-scale urea plants.
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