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Abstract: Duplex stainless steels, especially super duplex stainless
steels have very smart corrosion resistance and properties of strength.
The pitting corrosion resistance of as welded duplex stainless steels
SAF2205 decreased in CPT about 10℃ from that of their base metals.
The properties of strength decreased in an acceptable extent, showing
good weldability and post pitting corrosion resistance. For the weld of
super duplex stainless steel SAF2507, the CPT was as high as that of
its base metal, about 65～68℃. The decrease of its properties of strength
was very small. The width of its HAZ is rather narrow and the tendency
of grain growing was also small, showing remarkable pitting corrosion
resistance and weldability. The reason for the change in their
properties is studied with chemical composition and microstructure
analysis.
Key words: Duplex stainless steel Butt resistance welding Pitting
corrosion Property
CLC No: G441.
2
Received 20010521,
received in revised form 20010806
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