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Duplex Steel Supplier

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Duplex Stainless Steel Suppliers

 






Duplex Stainless Steel

Duplex stainless steels are called “duplex” because they have a two-phase microstructure consisting of grains of ferritic and austenitic stainless steel. The picture shows the yellow austenitic phase as “islands” surrounded by the blue ferritic phase. When duplex stainless steel is melted it solidifies from the liquid phase to a completely ferritic structure. As the material cools to room temperature, about half of the ferritic grains transform to austenitic grains (“islands”). The result is a microstructure of roughly 50% austenite and 50% ferrite.

Duplex and Super Duplex Stainless Steel

Duplex stainless steels earn their name as they have a two-phase microstructure that consists of grains of 50% austenitic and 50% ferritic stainless steel.

This type of steel has a selection of benefits, and it is often chosen over regular ferritic or austenitic stainless steels due to its increased strength – it is about twice as strong as these metals. Due to its increased yield strength, thinner sections of duplex stainless steels can be created, providing significant weight savings. This makes duplex stainless steel a popular choice for structural applications and pressure vessels.

As with all stainless steels, duplex stainless steels benefit from this characteristic. The level of corrosion resistance depends on the grade of duplex stainless steel, and these levels are similar to the range for austenitic stainless steels.

The ferritic part of the duplex stainless steels microstructure provides this type of steel with very good stress corrosion cracking (SCC) resistance, which makes it a popular choice for hot water tanks and process plants. This is a property that standard austenitic stainless steels do not possess, and they can be susceptible to in situations of elevated temperature or humidity.

Duplex stainless steels also exhibit better ductility and toughness compared to ferritic stainless steels, but they do not provide these properties as successfully as austenitic stainless steels.

These steels are also considerably cheaper compared to the equivalent austenitic and ferritic grades. This is because duplex stainless steels have lower molybdenum and nickel contents, and therefore a lower alloy surcharge.

Super Duplex stainless steel has all of the same benefits as its counterpart, the main difference being that this metal has a higher chromium and molybdenum content, which provides it with increased corrosion resistance.

Super Duplex stainless steel is often employed in the oil and gas industry, heat exchangers, offshore platforms, chemical processing equipment, boilers, and pressure vessels.

Duplex Stainless Steel ASTM Specifications

PIPE SMLS

PIPE WELDED

TUBE SMLS

TUBE WELDED

SHEET/PLATE

BAR

FLANGES, FITTINGS & VALVES

A790

A790

A789

A789

A240

A276

A182

 

Duplex Stainless Steel properties

Duplex Stainless Steel Chemical Composition

The following table shows the chemical composition of Duplex Stainless Steel.

%

2205

UR52N+

C

0-0.03

0.03 max

Mn

2.0

1.5

Si

1.0

0.8

P

0-0.03

0.035

S

0-0.02

0.02

Cr

21-23

24-26

Mo

2.5-3.5

3.0-5.0

Ni

4.5-6.5

5.5-8.0

N

0.08-0.2

0.2-0.35

Cu

-

0.5-3.0

Duplex Stainless Steel Physical Properties

The physical properties of Duplex Stainless Steel are highlighted in the following table.

Property

2205

UR52N+

Density (g.cm3)

7.805

7.810

Modulus of Elasticity (GPa)

200

205

Electrical Resistivity (Ω.m)

0.085x10-6

0.085x10-6

Thermal Conductivity (W/m.K)

19 at 100°C

17 at 100°C

Thermal Expansion (m/m.K)

13.7x10-6 to 100°C

13.5x10-6 to 200°C

Duplex Stainless Steel Mechanical Properties

The following table outlines the mechanical properties of Duplex Stainless Steel.

Grade

2205

UR52N+

Tensile Strength (MPa)

620

770

Proof Stress 0.2% (MPa)

450

550

Elongation A5 (%)

25

25

Duplex Stainless Steel Grades

  • Duplex 2205
  • Duplex 2507

Duplex Stainless Steel Price

Duplex Stainless Steel Price in India: US $6-20 per Pound

Who We are ?

  • Duplex Stainless Steel Suppliers
  • Duplex Stainless Steel Distributors
  • Duplex Stainless Steel Dealers in Mumbai
  • Duplex Stainless Steel Manufacturer in India
  • Duplex Stainless Steel Exporters
  • Duplex Stainless Steel Stockist
  • Duplex Stainless Steel Stock
  • Duplex Stainless Steel Suppliers in India

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Duplex Stainless Steel Products We Supply to:

Saudi Arabia, Iran, Iraq, UAE, Middle East, Qatar, Bahrain, Oman, Kuwait, Turkey, Yemen, Syria, Jordan, Cyprus, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Equatorial Guinea, The Republic Of Congo, Gabon, USA, Canada, Mexico, Panama, Costa Rica, Puerto Rica, Trinidad And Tobago, Jamaica, Bahamas, Denmark, North America, Africa, Europe, Russia, Norway, Germany, France, Italy, UK, Spain, Ukraine, Netherland, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Switzerland, Slovakia, Finland, Ireland, Croatia, Slovenia, Malta, Asia, India, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Mayanmar, Taiwan, Cambodia, South America, Argentina, Bolivia, Brazil, Chile, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay