Bellows is an important structure of GIS and GIL and

due to complicated service environment

requires stable microstructure performance

good formability

small temperature rise in service and meets excellent corrosion resistance of different regions. In this paper

304 stainless steel

304L stainless steel

321 stainless steel

316L stainless steel and Incoloy 825 are selected as the research objects to test their performance as candidate materials for bellows. The microstructure at specific strain levels is observed by optical microscope (OM) and X-ray diffraction (XRD). It is found that the transformation induced plasticity (TRIP) effect occurs and α′ martensite is observed in 304

304L and 321stainless steel. No phase transformation in 316L stainless steel and 825 alloy are found. The hardness increase magnitude in 304

304L and 321 stainless steel are bigger than that in 316L and 825 alloy during the hardness test. The magnetic variation of the material is studied by static magnetic measurement. It is found that both Br and Hc increase in varying degrees after deformation

showing that all candidate materials produce different degrees of magnetism. The corrosion resistance of different materials is studied by electrochemical test

which shows that the five test materials have good corrosion resistance in heavy polluted atmospheric environment above C4

with 316L stainless steel in particular. Therefore

316L stainless steel is recommended in the case of large deformation and harsh corrosive environment and 304 stainless steel is recommended in the case of small deformation and slight corrosion.