Duplex Stainless Steel

Chemipetro Limited offers a large variety of products in Duplex Stainless Steel alloys such as tubing, seamless- and welded pipe, butt weld fittings, flanges, pressure fittings and fasteners:

Duplex

Called duplex because of its mixed microstructure with about equal proportions of ferrite and and austenite, duplex stainless steels are a family of grades, which range in corrosion performance depending on their alloy content.

BENEFITS OF DUPLEX STAINLESS STEEL

  • High strength
  • A cost-effective alternative to austenitic stainless steel 316L.
  • High resistance to pitting, crevice corrosion resistance
  • High resistance to stress corrosion cracking, corrosion fatigue and erosion,
  • Good sulfide stress corrosion resistance,
  • Low thermal expansion and higher heat conductivity than austenitic steels,
  • Good workability and weldability,
  • High energy absorption.

DUPLEX STAINLESS STEEL APPLICATIONS

  • Heat exchangers, tubes and pipes for production and handling of gas and oil,
  • Heat exchangers and pipes in desalination plants,
  • Pressure vessels, pipes, tanks and heat exchangers for processing and transport of various chemicals,
  • Pressure vessels, tanks and pipes in process industries handling solutions containing chlorides,
  • Rotors, fans, shafts and press rolls where the high corrosion fatigue strength can be utilized,
  • Cargo tanks, piping and welding consumables for chemical tankers.

 

Duplex Chem Comp Duplex Chem Comp

 

 

Duplex Stainless Steel

As the UK's premier stockholder, manufacturer and supplier of flanges, pipe, pipe fittings and fasteners to the oil, gas and petrochemical industries worldwide, ChemiPetro is built on strong foundations and this begins with the materials we use.

These high quality materials include UNS S31803 (also known as UNS S32205/ SAF 2205) 1.4462 Duplex stainless steel, conforming to ASTM A182 F51, which is used in the production of our wide ranges of tubing, seamless- and welded pipe, butt weld fittings, flanges, pressure fittings and fasteners.

Strength and corrosion resistance

UNS S31803/ SAF 2205/ UNS S32205 1.4462 (ASTM A182 F51) Duplex grade stainless steel is approximately twice as strong as regular austenitic or ferritic steel, while still maintaining similar corrosion resistance to that of type 304 and 316 austenitic stainless steel. As a result, it is the material of choice in many applications in the oil, gas and marine industries. Furthermore, with excellent thermal conductivity duplex offers the added benefits of easy welding.

In marine, shipping, architectural and chemical industries, where austenitic ferritic iron chromium-Nickel Alloys with Molybdenum composition aid is essential for corrosion resistance, UNS S31803/ SAF 2205/ UNS S32205 1.4462 (ASTM A182 F51) Super Duplex offers even better resistance to erosion, corrosion cracking and corrosion fatigue than conventional steels. Furthermore, with a low coefficient of thermal expansion, Super Duplex stainless steel is ideal for mechanical components such as heat exchangers, cooling pipes and high strength wiring solutions.

A cost-effective solution

The microstructure of UNS S31803/ SAF 2205/ UNS S32205 1.4462 (ASTM A182 F51) Duplex steel is two-phase austenite and ferrite — basically a 50/50 composition. As Duplex has a higher yield strength this can have cost savings with reduced section thickness and reduced weight. It is used mainly in the oil and gas industries, along with marine and high chloride environments, while a new Duplex stainless steel, which is low in molybdenum (0.3%) and nickel, known as ‘lean Duplex‘, is now also being used in the storage of ethanol.

The benefits of Duplex stainless steel

In short, Duplex offers a plethora of benefits in terms of performance, cost, lifecycle and workability.

While it offers high strength and energy absorption it provides flexibility as a result of its good workability and weldability, as well as boasting low thermal expansion and higher heat conductivity than austenitic steels. With high resistance to pitting, crevice corrosion resistance, stress corrosion cracking, corrosion fatigue and good sulfide stress corrosion resistance, UNS S31803/ SAF 2205/ UNS S32205 1.4462 (ASTM A182 F51) stainless steel also provides a robust and cost-effective choice across a multitude of applications.

A multitude of applications

High level of anti-corrosion properties, combined with strength and workability make UNS S31803/ SAF 2205/ UNS S32205 1.4462 (ASTM A182 F51) stainless steel a cost effective and high performance material that provides a wealth of benefits across many applications. These include: heat exchangers, tubes and pipes for production and handling of gas and oil, and in desalination plants; pressure vessels, pipes, tanks and heat exchangers for the processing and transport of chemicals and in industries handling solutions containing chlorides; rotors, fans, shafts and press rolls where high corrosion fatigue strength is required; and cargo tanks, piping and welding consumables for chemical tankers.