Duplex Stainless Steel Pipe

Duplex Stainless Steel Pipe(DSS Pipe)is a high-performance stainless steel tubing characterized by a two-phase microstructure—consisting of roughly equal proportions of austenite and ferrite.This unique structure combines the advantages of austenitic and ferritic stainless steels,delivering exceptional mechanical strength,corrosion resistance,and stress corrosion cracking resistance.It is widely used in oil and gas,marine engineering,chemical processing,and other harsh service environments.

Key Features

High Strength:Approximately twice the yield strength of conventional 304/316 stainless steel,allowing for thinner wall designs and cost savings.

Excellent Corrosion Resistance:Superior resistance to pitting,crevice corrosion,and stress corrosion cracking(SCC),especially in chloride-containing environments.

Good Toughness:Balanced ductility and impact resistance across a wide temperature range.

High Thermal Conductivity&Low Thermal Expansion:Suitable for heat exchangers and high-temperature cycling applications.

Cost Efficiency:Often used as a more economical alternative to nickel-based alloys in aggressive media.

Common Grades

2205(S32205):The most widely used duplex grade,ideal for general severe corrosive and high-pressure applications.

2507(S32750):Super duplex stainless steel with higher PREN value,for extremely harsh offshore,deep-sea,and acidic environments.

2304(S32304):Lean duplex grade,cost-effective alternative to 316L with improved strength and corrosion resistance.

Typical Applications

Offshore oil and gas pipelines,risers,and flow lines

Seawater treatment,desalination plants,and marine piping systems

Chemical processing,pulp and paper manufacturing,and flue gas desulfurization(FGD)

Heat exchangers,pressure vessels,and high-pressure fluid transportation

Water treatment,sewage systems,and coastal infrastructure

International Standards

ASTM A790,ASTM A789,ASME SA789,ASME SA790,EN 10216-5,EN 10204-3.1