What is a super duplex tube?
A super duplex pipe or grade 2507 is a material with excellent corrosion resistance. It contains 25% chromium and 7% nickel.
A super duplex tube contains two grades of metal: ferritic and austenitic. This combination infuses the product with superior metallurgical properties. It is stronger and more abrasion resistant than duplex grades and better at resisting pitting and cracking.
You can find super duplex tubing in oil and gas refiners, nuclear plants, chemical processing, etc. It gets regularly used in marine industries due to its inimitable performance in contact with seawater and salts.
Other grade list
Super duplex seamless tube suppliers in UAE
What are the benefits of super duplex tubing?
The most significant benefit is that this material is highly corrosion-resistant. It does not rust in the presence of abrasive chemicals. Super duplex material receives strength from the ferritic structure and corrosion resistance from the austenitic one. Super duplex grade condenser tubes can operate in versatile conditions and resist pitting and stress-induced cracking.
The abrasion handling of super duplex components is exemplary. A super duplex stainless steel redrawn tube can tolerate seawater, chlorides, acids, and other harsh media without facing deformation. This cost-efficient material resists stress-related cracking and is also stable. It proves to be a dependable solution for versatile industries without resorting to pricier alloys.
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Is a super duplex seamless tube better than a duplex?
Super duplex grades display better corrosion resistance than duplex components. It can deliver improved performance in settings that get exposed to abrasive chemicals. Since it has high chromium content, its Pitting Resistance Equivalent Number or PREN is also high (over 40). It lends it better corrosion resistance than duplex components.
A super duplex seamless tube also displays more strength than a duplex. It has good weldability as well. However, neither duplex nor super duplex truly excels in weldability, which is why it shouldn’t be the prime consideration during procurement. One area where the duplex is better is the cost; super duplex components are more expensive and suited to larger budgets.
Super duplex steel welded tube and redrawn tubing are available in round, square, or rectangular shapes
What is the purpose of a super duplex stainless steel tube corrosion test?
The prime benefit of this tubing is its above-par corrosion resistance. A corrosion test helps ascertain that the material delivers the expected properties. It is imperative for super duplex tube suppliers to conduct this test as such piping often gets used in critical applications like pharmaceuticals and chemical processing. Here safety is essential.
Corrosion tests typically get based on the service history and performance. You can also conduct an accelerated test to get quick results. Non-destructive testing includes ultrasonic and a scanning electron microscope (SEM). The former can detect internal flaws and changes in thickness. The latter is better at identifying micro-cracking and problems in molecular composition.
Frequently Used Super duplex tube types
Super duplex tubing
Super duplex seamless tube
Super duplex steel welded tube
Super duplex stainless steel redrawn tube
Super duplex annealed tube
SDSS square tubing
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Why is the Charpy impact test used for SDSS Tubes?
This inexpensive test determines the impact toughness of the super duplex piping. The Charpy test on SDSS square tubing detects the capacity of a metal to tolerate a sudden load or shock. It refers to the amount of energy that gets absorbed during the impact. Duplex stainless steels contain both austenitic Ferritic steel has lowered impact toughness at low temperatures, turning brittle. Since SDSS tubes have ferritic microstructures, this test is essential to ensure the safety and reliability of the super duplex heat exchanger tubes.
During the test, a specimen gets struck by a weighted pendulum. The absorbed energy gets recorded. The Charpy test quickly tells you that the product is reliable and high-quality.
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Applications of super duplex steel tubes
The superior chemical profile of this material makes it attractive to many industries. You can see a super duplex steel welded tube employed in petrochemicals, chemical processing, oil and gas refiners, etc. Its thermal properties make it a good fit for heat exchangers. A bulk of their applications lie in marine and subsea applications. This material delivers a long service life in seawater.
It performs well in hydraulic applications, instrumentation processes, marine industries, and offshore operations. A super duplex alloy annealed tube generally gets used for piping, fittings, flanges, etc. Heat exchangers, structural components, and cargo tanks also utilize this material.