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Super Duplex and Duplex stainless steel
The first-generation Duplex stainless steels were developed more than 70 years ago in Sweden for use in the sulfite paper industry. Duplex alloys were originally created to combat corrosion problems caused by chloride-bearing cooling waters and other aggressive chemical process fluids.
Called Duplex because of its mixed microstructure with about equal proportions of ferrite and austenite, Duplex stainless steels are a family of grades, which range in corrosion performance depending on their alloy content. The term "Super-Duplex" was first coined in the 1980's to describe a highly alloyed, high-performing Duplex steel with a pitting resistance equivalent of >40 (based on Cr% + 3.3Mo% + 16N%).
Due to its increased levels of Chromium, Super-Duplex steel provides exceptional resistance to a range of acids, acid chlorides, caustic solutions and other environments in the chemical/petrochemical, pulp and paper industries, often replacing 300 series stainless steel, high nickel super-austenitic steels and nickel-based alloys.
Benefits:
- High strength,
- High resistance to pitting, crevice corrosion resistance.
- High resistance to stress corrosion cracking, corrosion fatigue and erosion
- Excellent resistance to chloride stress-corrosion cracking
- High thermal conductivity
- Low coefficient of thermal expansion
- Good sulfide stress corrosion resistance
- Low thermal expansion and higher heat conductivity than austenitic steels
- Good workability and weldability
- High energy absorption.
Industry Applications:
- Water Filtration
- Wind Turbine components
- Heat exchangers, tubing and pipes for the production and handling of gas and oil
- Liquid transport in desalination plants
- A wide range of mechanical and structural components
- FGD systems in the Power Industry
- Pipes for process industries handling chlorides
- Utility and industrial systems, rotors, fans, shafts and press rolls where the high corrosion fatigue strength can be utilized
- Shipping - Vessels, Cargo tanks, any piping or welding consumables for chemical tankers
- High-strength, highly resistant wiring
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