Duplex Stainless Steel Applications

  • Duplex stainless steel is a kind of stainless steel composed of ferrite and austenite
  • Duplex stainless steel applications in various industries is introduced

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Because of the high strength of duplex stainless steel, it can save material, such as reducing the wall thickness of the pipe.

Take SAF 2205 and SAF 2507 as examples.

SAF 2205 is suitable for chlorine-containing environment, and this material is suitable for oil refining or other process media.

SAF 2205 is especially suitable for heat exchanger with brackish water as a cooling medium. This material is also suitable for sulfuric acid solution and their mixture, e.g

Duplex Stainless Steel
  • Oil pipe in oil and natural gas industry
  • Crude oil desalting
  • Sulfur-containing gas purification
  • Wastewater treatment equipment in refinery
  • Cooling system using brackish water or chlorine solution

Duplex Stainless Steel Applications

Duplex stainless steel applications are as follows


Equipment name

Medium condition

Materials and problems

Duplex stainless steel application


Oil field and oil well mouth pipeline


When the carbon steel lining is used for 3-9 months, SCC will be produced in 304 in a short time

Started in 1980


Oil field air cooler




Refinery distillate


The pitting corrosion and SCC of carbon steel in service for 1 year and 321 for half

Started in 1985


Refinery air cooling tower

0.1 kPa ~1kPa

Carbon steel and 13% ~ 17% Cr ferritic stainless steel are easy to be damaged

Started in 1983


Polyethylene product cooler

Tube side: polyethylene gas mixture,100℃,2MPa 

Shell side: including100×10-6C freshwater,Material temperature <100℃

304L tubesheet damaged due to SCC

Good condition after changing SAF2205 steel


Air cooler for offshore gas field

Tube side:CO2:25%,Wet natural gas with CI,90℃,13MPa


Started in 1980


Seawater heat exchanger for soda production

Tube side: seawater, inlet temperature12℃~31℃,outlet temperature40℃~60℃

Shell side:NH357%,CO233%,H2O10%,Oxygen free H2S

The welding seam of Ti welded pipe is damaged for 2-3 years, and Ti ground seam pipe is invalid after 7-8 years of service

Started in 1983

Duplex stainless steel also has many important applications in the processing industry.

Our Duplex Stainless Steel Grades

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