Influence of Nb/Ti on Corrosion Resistance Properties of Low Chromium Ferritic Stainless Steels

The corrosion resistance of low-chrome ferritic stainless 409 L,409 M,410 L,410 S were evaluated by the chemical immersion erosion test,electrochemical corrosion test and intergranular corrosion test,and morphology and component analysis of corrosion film on the tested stainless steels’ surface were studied by Scanning Electron Microscopy.Compared with type 410 stainless steels,the corrosion rate of type 409 stainless steels is obviously decreased by the addition of Nb and Ti.Due to the existence of inclusions containing Nb and Ti,for example TiS,Ti（CN）and Nb（CN）,the pitting corrosion and intergranular corrosion resistance performances of type 409 stainless steels are observed,but type 410 stainless steels is readily to produce the general corrosion.