Guide On Duplex Steel Round Bars

Guide On Duplex Steel Round Bars

What are Duplex Steel Round Bars?

Super Duplex Round Bars provide better corrosion resistance, particularly chloride stress and pitting corrosion, and higher strength than standard austenitic stainless steels such as Type 304 or 316. A 22%Cr duplex stainless steel round bar has a minimum 0.2% proof strength of some 450N/mm2, and a Duplex steel bar, a super duplex grade, a minimum of 550N/mm2.

We can divide Duplex Steel Round Bars into three main groups based on their alloying level, measured in terms of ‘PREN’ (pitting resistance equivalence number), which measures the alloy’s resistance to pitting corrosion. These groups are lean duplex round bar, 22%Cr duplex steel hex bar, and 25%Cr super duplex round bar. Additionally, manufacturers have developed higher alloyed grades, including hyper duplex grades.

Duplex Steel Bar is calculated from a simple formula: = %Cr + 3.3%Mo +16%N and an allowance for W is sometimes made, having a factor of 1.65. A duplex stainless steel round bar is less than 40; a super duplex hex bar is between 40 and 45; a hyper duplex round bar is above 45, whilst the lean grades typically have lower nickel and hence the lower price.

Features of Duplex Steel Round Bars

  • High resistance to general corrosion.
  • They have excellent resistance to stress corrosion cracking in chloride-containing environments.
  • Excellent resistance to pitting and crevice corrosion.
  • Very high mechanical strength.
  • Physical properties that offer design advantages.
  • High resistance to erosion, corrosion and corrosion fatigue and good weldability.
  • Excellent mechanical properties that allow for lighter constructions, more compact design, and less welding.

Applications of Duplex Steel Round Bar

It is used in Pipeline engineering.

Duplex Steel Round Bar Used for Oil & gas industry.

The use of double steel round bars in mechanical engineering.

Duplex Steel Round Bar is also very common in the Marine industry.

These products Use for Wastewater Management.

Duplex Steel Round Bar Used for the Chemical Industry.

Petrochemical industry.

Duplex Steel Round Bars Use for the Power Industry.

Using double-sided steel round bars for the aerospace industry.

Duplex Steel Round Bars Used in the Food processing industry and many more.