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dublex ss has 22% or more but ss has 18%cr or less

the main difference is that duplex is a mix of a ferrite / austenite structure approx 50%/50%, and so the name "duplex" while stainless steel has just one structure, for example the 18/10 is an austenitic.

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Q: Difference between stainless steel and duplex stainless steel?
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Difference between duplex stainless steel and stainless steel?

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