Difference between duplex stainless steel and ferritic stainless steel

Duplex stainless steel pipe has good weldability.Compared with ferritic stainless steel and austenitic stainless steel,it is neither like the weld heat affected zone of ferritic stainless steel,nor is it sensitive to weld hot crack as austenitic stainless steel.

Duplex stainless steel pipes

Duplex stainless steel is widely used in petrochemical equipment,seawater and wastewater treatment equipment,oil pipeline, paper machinery and other industrial fields because of its special advantages.In recent years,duplex stainless steel has also been studied and applied in the field of bridge load-bearing structure,which has good prospects for development.

Ferritic stainless steel pipes

The advantages of duplex stainless steel compared with ferritic stainless steel:

(1) The comprehensive mechanical properties of ferritic stainless steel are better than that of ferritic stainless steel, especially its plasticity and toughness.It is not as sensitive to brittleness as ferritic stainless steel.

(2) Except the stress corrosion resistance, the local corrosion resistance of ferritic stainless steel is better than that of ferritic stainless steel.

(3) The cold working process and cold forming properties are much better than those of ferritic stainless steel.

(4) Welding performance is much better than that of ferritic stainless steel. Generally, there is no need for preheating before welding and no need for heat treatment after welding.

(5) The application range is wider than that of ferritic stainless steel.

The disadvantage of duplex stainless steel compared with ferritic stainless steel:

Alloy element content is high,the price is relatively high,generally the ferrite does not contain nickel.