Duplex Steel appeared in the marketplace due to the need to combat the shortcomings of austenitic and ferritic steels. It was found that a mixture of these two materials resulted in higher strength, reduced weight, good weldability and increased resistance to stress corrosion cracking.
Unlike similar steels, duplex also displays improved resistance to localised corrosion, particularly pitting, crevice corrosion and stress corrosion cracking. Due to its ferritic qualities, it also shows very good resistance to stress corrosion cracking when compared to standard austenitic. In some cases, the strength of duplex stainless steel can be up to double that of the most commonly used grades of stainless steel.
Another benefit is that because it has a lower nickel and molybdenum content than other austenitic stainless steels, it can prove to be a more cost-effective option due to its lower alloy content.
These benefits clearly show why Duplex Stainless Steel has become popular in applications such as pressure vessels, cooling pipes and storage tanks.
Duplex becomes brittle at extreme temperatures so its use is normally restricted to a maximum temperature of 300 degrees and shows signs of embrittlement at –50 degrees.
The Benefits of using Duplex Stainless Steel Pipe:
- Stronger than 300 series stainless steel which also brings weight advantages
- High resistance to pitting, crevice corrosion and stress corrosion cracking
- Higher heat conductivity and lower thermal expansion than austenitic steels
Duplex Stainless Steel Pipe is used in:
- Pipes for production and transportation of oil and gas
- Structural and mechanical components
- Heat exchangers
- Cooling pipes
For more information about our Duplex Stainless Steel range of products, please contact your local Special Piping Materials sales adviser today.