Duplex 2205 stainless steel is resistant to chlorides and H2S. Is a problem solver in most industry fields. Duplex 2205 is used in heat exchangers and piping in the oil and gas, refinery, chemical and petrochemical industries.
The design strength of 2205 is significantly higher than that of 316/316L, often allowing for lighter wall construction. 2205 has good notched impact toughness at temperatures below 40°F. Duplex is welded with E2209 or ER2209 filler.
Grade 2205 stainless steel has excellent corrosion resistance, much better than grade 316. It resists localized corrosion types such as intergranular, crevice and pitting corrosion. This stainless steel has a CPT of approximately 35°C. This grade is resistant to chloride stress corrosion cracking (SCC) up to 150°C. Grade 2205 stainless steel tubing is a good alternative to austenitic grades, especially in premature failure environments and marine environments.
The high oxidation resistance of Grade 2205 is compromised by embrittlement above 300°C. This embrittlement can be changed by full solution annealing. This grade performs well at temperatures below 300°C.
The most suitable heat treatment for this grade is solution treatment (annealing) at temperatures between 1020 – 1100°C followed by rapid cooling. Grade 2205 can be work hardened but not heat hardened.
Due to its high strength, this grade has low machinability. Cutting speed is almost 20% lower than 304 grade. The manufacture of this grade is also influenced by its strength. Bending and forming of this grade requires higher capacity equipment. Grade 2205 is less ductile than the austenitic grades; therefore, cold heading is not possible in this grade. In order to perform a cold heading operation on this grade, an intermediate anneal should be performed.
Some typical applications for Duplex Steel 2205 are oil and gas exploration, processing equipment, transportation, storage and chemical processes, high chlorine and marine environments, paper machines, liquid tanks, pulp and paper digesters.
