(Super) Duplex Stainless Steel Tube/Pipe

Duplex Stainless Steel is composed of approximately the same amount of ferrite and austenite stainless steel. Duplex Stainless Steel Pipe’s beneficial performance is attributable to a combination of austenitic and ferrite alloys in its microstructure, combining both steels into one metal joins the most attractive properties of each one to form a stainless steel family with outstanding characteristics. 

So Duplex Stainless Steel Pipe achieving both strength and high corrosion resistance. And Duplex Stainless Steel Tube is known to have better stress corrosion, cracking resistance and mechanical properties.

Compared with carbon steels and conventional stainless steel, Duplex Stainless Steel Tube displays improved resistance to localized corrosion, particularly pitting, crevice corrosion and stress corrosion cracking. In some cases, the strength of Duplex Stainless Steel Tube can be up to double that of the most commonly used grades of stainless steel. Those ensure Duplex Stainless Steel Pipe has significantly more uptime. 

Mechanical properties of Duplex Stainless Steel Pipe are approximately double those of singular austenitic steel, so the mechanical strength allows for lighter constructions, more compact system design and less welding.

Duplex becomes brittle at extreme temperatures so its use is normally restricted to a maximum temperature of 300 degrees and shows signs of embrittlement at –50 degrees. Gaolin Stainless Steel Tube Manufacturer is a duplex stainless steel pipe supplier, offering high quality duplex stainless steel pipe and duplex stainless steel tube.

Advantages of Duplex Stainless Steel Pipe:

● Corrosion Resistance

Duplex Stainless Steel Pipe is extremely corrosion resistant. They have high resistance to intergranular corrosion. Even in chloride and sulfide environments, Duplex Stainless Steel Pipe exhibit very high resistance to stress corrosion cracking. The Super Duplex Stainless Steel Pipe is even more resistant to corrosion.

● Heat Resistance

The Duplex Stainless Steel Tube becomes embrittlement only at temperatures over about 300°C. At low temperatures Duplex Stainless Steel Tube have better ductility than the ferritic and martensitic grades. Duplex Stainless Steel Tube can readily be used down to at least -50°C.

● Weldability

Duplex Stainless Steel Pipe has 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 Stainless Steel Pipe reduces distortion and residual stresses after welding.

● High yield strength

Because of Duplex Stainless Steel’s increased yield strength over austenitic stainless steel, it is possible to reduce section walls of components. This can lead to reduced material costs and weights. In structural applications or in pressure vessels and storage tanks, requiring less material is very cost-effective.

● Deliver many years of economical service life

● Eliminate expensive downtime due to equipment failure

● Remove possibilities of process fluid leaks

● Effectively protect against stress cracking

● Accommodate high steam pressure


Duplex Stainless Steel Pipe


● Chemical processing, transport, and storage

● Oil and gas exploration and offshore rigs

● Oil and gas refining

● Marine environments

● Pollution control equipment

● Pulp & paper manufacturing

● Chemical process plant

● Structural and mechanical components

● Heat exchangers

● Cooling pipes

● Cargo vessels and containers

● High strength wiring

● Chemical process vessels, piping and heat exchangers

● Pulp mill digesters, bleach washers, chip pre-steaming vessels

● Food processing equipment

● Flue gas desulfurization equipment

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