What are Duplex Steel Round Bars?



 As the name suggests, Duplex Steel Round Bars are made up of stainless steel round bars enriched with molybdenum and chromium. This combination provides excellent corrosion resistance and stress cracking resistance. This alloy is also exceptionally tough and strong under high temperatures.

The Super Duplex Round Bar is designed to offer better corrosion resistance, particularly chloride stress corrosion and chloride pitting corrosion, while also providing a higher degree of strength than standard austenitic stainless steels like Type 304 or 316. In the case of a 22%Cr duplex stainless steel round bar, the minimum strength is 0.2%, which is about 450N/mm2, while a super duplex steel bar has a minimum strength of 550N/mm2. There are three main groups of duplex steel round bars; they include lean duplex round bars, duplex steel hex bars with 22% Cr, super duplex round bars with 25% Cr, and even higher alloyed, hyper duplex grades that have been developed. This division is primarily based on the alloying level of the alloy, for example in terms of 'PREN' (pitting resistance equivalence number), which measures the alloy's resistance to pitting corrosion. The PREN for super duplex steel bars is derived from a simple formula: PREN = %Cr + 3.3%Mo + 16%N and an allowance for W is sometimes taken into account, which has a factor of 1.65.


It is important to note that duplex stainless steel round bars have a PREN of less than 40, super duplex hex bars have a PREN between 40 and 45 and hyper duplex round bars have a PREN above 45, whilst lean grades have lower nickel content and are therefore cheaper.


There is a moderate amount of nickel in the duplex stainless steel bar and a high amount of chrome in it. It is due to their balanced microstructure and chemical composition, which equals the volume percentage of austenite and ferrite grades, that duplexes have such properties as corrosion resistance and mechanical characteristics. 


This duplex ball value suppliers' nature allows it to exhibit both austenitic and ferritic properties. In general, duplex stainless steels have a higher strength than the other two grades.


Duplex Steel Round Bars

  • The Super Duplex Round Bar is designed to offer superior corrosion resistance, particularly chloride stress corrosion and chloride pitting corrosion, as well as high strength and resistance to corrosion than standard austenitic stainless steels. There is a minimum proof strength of 0.2% for a 22%Cr duplex stainless steel round bar and a minimum proof strength of 550N/mm2 for a super duplex stainless steel round bar, whereas a proof strength of 0.2% for a duplex steel bar is some 450N/mm2.


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https://triroundbars.com/what-are-duplex-steel-round-bars/ 



#aluminum #copper #metalart #metalwork #iron #engineering #welding #fabrication #metal #steel 

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