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Cupronickel 90/10 (C70600) vs 70/30 (C71500): properties, ASTM standards, applications, and procurement guide. Certified cupro nickel supply
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Cupronickel 90/10 (C70600) vs 70/30 (C71500): properties, ASTM standards, applications, and procurement guide. Certified cupro nickel supply
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Why seawater engineers trust copper nickel over stainless steel
Seawater destroys most metals.
316L stainless steel pits in hot chloride environments. Carbon steel rusts without coating. Titanium works but costs 4× more.
That's why marine and offshore engineers have been specifying cupronickel for over 100 years.
✅ Resists seawater corrosion without coatings ✅ Naturally anti-biofouling — no barnacles, no biofilm ✅ Immune to stress corrosion cracking in chloride environments ✅ High thermal conductivity for heat exchangers and condensers
The two grades you need to know: C70600 (90/10) — the workhorse. Condensers, ship hulls, marine piping. C71500 (70/30) — the upgrade. Offshore risers, desalination brine, high-velocity service.
Full procurement guide — properties, ASTM standards, and grade selection: 👉 https://niftyalloys.com/blogs/cupronickel-c70600-c71500-guide