I. Petrochemical and energy industries
Oil and gas extraction and transportation: Applicable to highly corrosive oil and gas field pipeline systems containing hydrogen sulfide and carbon dioxide to prevent backflow of acidic media. 2205 duplex steel can withstand high pressure (Class 2500) and high temperature (≤350°C) working conditions58.
Oil refining and petrochemical units: Used in acid (such as concentrated sulfuric acid and acetic acid) pipelines for catalytic cracking units and ethylene cracking units in refineries. The sealing surface uses cemented carbide cladding technology to achieve zero leakage57.
II. Marine engineering and environmental protection fields
Seawater desalination and ship systems: 2507 Duplex Stainless Steel Check Valve can resist seawater chloride ion corrosion and achieve long-term stable operation in the outlet of seawater desalination high-pressure pumps and LNG ship fuel pipelines (the service life is more than 3 times longer than 316L)46. High-chlorine wastewater treatment: used in wastewater treatment systems in the printing and dyeing and electronics industries, resistant to corrosive media with chloride ion concentrations ≥5000ppm, and suitable for temperatures ranging from -50 to 200℃46.
III. Chemical and special industrial scenarios Fertilizer and phosphorus chemical industry: In high-temperature (≤300℃) ammonia-containing media in urea synthesis and phosphate fertilizer production, duplex steel has better stress corrosion cracking resistance than traditional austenitic stainless steel58.
Pulp and papermaking and textile printing and dyeing: suitable for bleaching sections (containing chlorine bleaching agents) and dyeing and finishing acid wastewater discharge systems to prevent strong oxidizing media from backflowing and damaging equipment45.
IV. Electricity and municipal infrastructure Nuclear power and thermal power systems: used for the control of boric acid solution in the secondary circuit of nuclear power plants and the outlet of the slurry circulation pump of the desulfurization tower of thermal power plants, meeting the high-pressure sealing requirements of the ASME B16.34 standard57. Urban pipe network and fire protection system: Wafer-type duplex steel check valves (such as H76X series) are suitable for DN15~1200mm pipes to prevent medium backflow and cause pipe network pressure fluctuations in HVAC and fire protection water supply systems
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