The Duplex 2205 Welded Pipes are also highly resistant to chloride ion corrosion stress cracking. This property makes it a good choice for sea water and marine applications. The duplex material contains bot the austenitic and ferrite structures in the metallurgy of the material. These properties bring the material the best of both ferritic and austenitic steel types. These properties bring the material the best of both ferritic and austenitic steel types. The Duplex 2205 Welded Pipes are made for use in the various places.