What is the differences between austenitic and duplex stainless steel?

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Property	Austenitic Stainless Steel	Duplex Stainless Steel
Crystal Structure	Face-Centered Cubic (FCC)	Mixed: 50% Austenite + 50% Ferrite
Strength	Moderate strength; can be increased by cold working	About twice as strong as austenitic due to dual-phase structure
Corrosion Resistance	Excellent general corrosion resistance	Superior resistance to pitting and stress corrosion cracking
Magnetic Property	Non-magnetic in annealed condition	Partly magnetic due to ferritic phase
Weldability	Excellent weldability and formability	Good weldability but needs phase control during welding
Toughness	Very good, even at low temperatures	Good, but slightly lower than austenitic grades
Cost	Higher cost because of high nickel and molybdenum content	More cost-effective; lower nickel content
Thermal Conductivity	Lower	Higher than austenitic
Applications	Kitchen utensils, chemical plants, cryogenic equipment, architectural structures	Offshore platforms, pipelines, desalination plants, chemical and marine industries
Example Grades	304, 316, 321, 310	2205, 2507, UNS S31803
Main Advantage	Excellent corrosion resistance and ductility	High strength and excellent resistance to chloride stress cracking
Main Limitation	Lower strength and prone to stress corrosion cracking	Limited use at very high temperatures due to ferrite phase instability