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  1. Duplex stainless tube
  2. Duplex stainless tube

Duplex stainless tube

Standard:GB/T21833-2008,ASME SA789/SA790.S31500 S31803 S32205 S32750.

  1. Detailed information

Duplex stainless tube Usage heat exchanger and tube on oil desalt device, catalyst tubebank of tubular reactor for methanol manufactering,precondenser for VCM, convey pipe and header of land/ocean oil/gas industry; heat exchanger, water treatment and supply,system, fire extinguishing system, spraying system and water stablizing system of onsea petrol platform; pressure vessel, chanels, tanks, and heat exchanger used in chemicals process and transportation in chemical industry.

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Duplex stainless steel (DSS) is featured with structure of two phases (α and γ) and has characteristics of both ferritic and austenitic stainless steel. It has good corrosion resistance and high strength. It is alloyed with 18%-28% Cr and 3%-10% Ni in the condition of low C. Some steels also contain the alloy elements such as Mo, Cu, Nb, Ti and N, etc.

Comparing with ferritic stainless, duplex stainless steel has higher plasticity, ductility and better intergranular corrosion resistance and weldability. It keeps same 475 brittleness with ferritic stainless and high thermal conductivity. Duplex has improved yield strength, resistance to intergranular corrosion, stress corrosion, corrosion fatigue and abrasion & corrosion compared with austenitic stainless steel.


1.Superior resistance to general and local corrosion, especially to stress corrosion, pitting corrosion, crevice corrosion, corrosion fatigue and abrasion & corrosion.
2.Good weldability
3.Good mechanical properties
4.Excellent intergranular corrosion resistance
5.High cost-effectiveness, long life time.

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