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such as deep-sea mining and highchloride conditions. |
Super duplex |
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Standard duplex |
Lean duplex |
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Lean duplex |
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Standard duplex |
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Conclusion Duplex stainless steel is widely used in deep-sea applications- including subsea pipelines, umbilicals, risers, marine structures, and desalination systems- due to its strength, corrosion resistance, and cost-effectiveness. While it offers an excellent balance of properties, alternative materials such as super duplex stainless steels and nickelbased alloys are often preferred in more extreme environments. Ultimately, duplex stainless steel remains a proven, reliable option for many critical components in seabed mining operations. |
Strength
resistance and high strength are sufficient.
• Standard Duplex( 22 – 25 % Cr, 3 – 6.5 % Ni, moderate Mo and N) strikes a balance between mechanical strength and corrosion resistance, making it
Corrosion resistance
Figure 1. Characteristics of duplex stainless steel
Cost
suitable for a wide range of subsea applications.
• Super Duplex( 25 – 27 % Cr, 6 – 8 % Ni, higher Mo and N) offers superior corrosion resistance and mechanical properties. Grades like 2507 excel in highly aggressive environments,
References
1. Summer XU, Head of Overseas Markets, Nickel Alloy
2. Oliver Ashford et al, World Resource
Institute 3. International Seabed Authority, 4. China’ s Progress, ISA, 5. ASTM / AISI, 6. Advances in Stainless Steel Metallurgy and Advanced Science by BaldevRaj et al.( Indian Scientist & Metallurgist)
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