(1) Mae gan ddur gwrthstaen deublyg sy'n cynnwys molybdenwm wrthwynebiad cyrydiad straen clorid da o dan straen isel. Yn gyffredinol, mae dur gwrthstaen austenitig math 18-8 yn dueddol o bwysleisio cracio cyrydiad mewn toddiannau clorid niwtral uwchlaw 60 ° C. Heat exchangers, evaporators and other equipment made of this type of stainless steel have a tendency to produce stress corrosion cracking in trace chloride and hydrogen sulfide industrial media, while duplex stainless steel has good resistance.