Answer:
There is not a straight forward answer. There are many grades and variants of Stainless steel. The highest contributor to the Anodic index of stainless steel is the amount of Chromium in the different grades. Taking this into consideration, High Chromium content Stainless Steel would have an Anodic index of around 0.50, whiles the lowest grade stainless steel variants would have an Anodic index of around 0.85.