Duplex stainless steel welded pipe is an excellent choice for various industries due to its high strength and corrosion resistance properties, which results in a material that has high strength, excellent corrosion resistance, and outstanding toughness. Some of the most commonly used duplex steels are 2205, 2507, 904L, and 254SMO. These grades are very suitable for water treatment and desulfurization environmental protection equipment.

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  Duplex 2205 pipe: This grade is a combination of chromium, molybdenum, and nitrogen. It is highly resistant to corrosion and is widely used in the chemical processing and oil and gas industries.

  
  

   

  
  

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  Super duplex 2507 pipe: This is a higher grade of duplex steel that contains more molybdenum and chromium. It is highly resistant to corrosion, erosion, and stress corrosion cracking. This grade is used in high-temperature and high-pressure applications.

  
  

   

  
  

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  904L stainless steel pipe: This grade is a low carbon, high alloy austenitic stainless steel. It is highly resistant to corrosion, especially in sulfuric acid and chloride conditions. It is commonly used in chemical processing and oil and gas industries.

  
  

254smo pipe: This grade contains high levels of molybdenum, chromium, and nitrogen, making it highly resistant to corrosion and pitting. It is commonly used in the pulp and paper, chemical processing, and oil and gas industries.

The specifications for duplex steel welded pipes vary depending on the grade. However, the chemical composition is typically similar

- Chromium: 21-30%

- Nickel: 5-8%

- Molybdenum: 2-5%

- Nitrogen: .08-.2%

- Carbon: .03-.06%

- Iron: balance

Welding of Duplex stainless steel

Duplex stainless steel have good weldability. All standard welding processes can be used. They are not quite as easily welded as the austenitic grades but low thermal expansion in duplex grades reduces distortion and residual stresses after welding

Duplex steel welded pipes are used in a variety of industries, including:

- Chemical processing

- Oil and gas

- Pulp and paper

- Power generation

- Water treatment

- Food processing

- Marine