Since there are multiple grades of duplex stainless steel and stainless steel, the advantages and disadvantages of each grade depend on its use and the chemical composition of the grade.
For example, the 300 series austenitic stainless steel has excellent ductility, improved corrosion resistance, and good mechanical strength. Their chemistry can be altered by reducing or increasing their carbon content for specific purposes, such as welding or use at high temperatures.
Compared with austenitic stainless steel and duplex stainless steel, martensitic stainless steel and ferritic stainless steel have better hardness and lower corrosion resistance.
Because duplex stainless steels are highly alloyed, the cost of using these metals can be high. However, grades like 904L cost more than some standard duplex stainless steels.
In addition to the cost factor, few stainless steel alloys can be used at high temperatures, unlike nickel alloys such as Monel, inconel, etc.
Another disadvantage of these alloys is their impact resistance, which is not good at temperatures of minus 50 degrees Celsius.