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Duplex Stainless Steel – An Overview

Science Kuldeep 21 September 2020

The word Duplex means double layer material, So Duplex Stainless steel is that whose microstructure consist of two phases having grains of austenitic (face -centered cubic lattice) and delta ferrite (body centered cubic lattice) in equal proportion i.e 50-50 %.

The duplex steel began to be looking as best alternative in market to fulfil or overcome the deficit of austenitic and ferritic steels due to its higher strength, good weldability and high resistance to crevice, stress & pitting corrosion cracking as it is a mixture of both.

Due to presence of molybdenum in this grade, it exhibit very good thermal heat conductivity, toughness, higher temperature strength and high resistance to radiation swelling which makes it more demanding and good future aspect for the steel industries worldwide for many applications.



The duplex Stainless steel exhibit various appealing properties which gives value to its family as shown below:

  • Strength – Duplex Steels are usually exhibits higher strength (almost twice) as compared to Austenitic &Ferritic Grades.
  • Corrosion Resistance – It also exhibit high resistance to crevice and pitting corrosion like autenitic grades.
  • Stress corrosion Cracking– It shows excellent resistance to chloride stress corrosion cracking, the property they have got from ferritic side.
  • Toughness and Ductility They possess better toughness and ductility than ferritic grades but didn’t overcome the austenitic grades in these properties.

Cost saving benefits with attractive properties makes the Duplex Stainless Steel a good choice for Steel Industries Project.

Due to lower nickel content, the cost of these grades are comparatively lower than austenitic grades especially when the alloy surcharge is on higher side. It also possess good thermal conductivity as compared to austenitic grades due to presence of lower nickel content.

Price are much more stable in duplex grades as compared to austenitic grades if we see over the long period of time due to low alloying elements.

Application of Duplex Stainless Steel

The duplex stainless steel has a demand in those applications where high strength and corrosion resistance is required as shown below.

  • Chemical Industry –As it exhibit higher corrosion resistance in chemical environment, Duplex Stainless steel is most widely used in manufacture of sea water heat exchanger, water treatment plants etc.
  • Petrochemical Industry– Duplex steels has a different properties ie excellent resistance corrosion especially chloride stress corrosion cracking which makes it best suitable for this industry for example: manufacture of pressure vessels, tubes, pipes etc.
  • Aerospace Industry– Due to better strength to weight ratio, it is used in various aerospace applications such as shaft.
  • Oil & Gas industries
  • Pharmaceutical Industry
  • Construction Projects such as bridges, storage tanks, wind turbines etc where higher strength and fatigue resistance is required.
  • In manufacturing of Fasteners, Screw, Nut, Flanges
  • Marine Industries – Due to its high corrosion resistance properties, it is very much useful in marine industry such as in manufacture of pistons.

Ambica steels offers Duplex Stainless Steel Round Bars – Balance is the Key…..

The structure and metallurgy of Duplex Stainless Steel is very much complex as compared to Austenitics and Ferritic grades which is very difficult to produce. The balance of maintaining the properties is most important key factor in producing duplex steel.

We are specialize and having a rich experience to produce this grades in our regular practice which makes us different and superior from others suppliers in India.

We are supplying many grades of this family globally on regular basis such as

  • 4462|F51
  • 4410|F53
  • 4462|F60
  • 4460|329


The author is a senior creative writer with a leading Digital Agency. In his free time, he likes to write blogs and articles on home décor – about bathroom fittings, décor trends, sanitaryware suppliers, Electronics, Lifestyle, and much more. The author possesses an experience of 6 years in the field of Digital marketing.

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