I just got paid money to dismantle and take home a huge old catalytic oven. It was burning off something and then cleaning the smoke with titanium dioxide catalyst pellets.
Inside of it there are heavy grates made of 1/4" strips of metal. The grates were supporting the mass of pellets.
They are not magnetic but I wonder if they are regular stainless or maybe some other grade of stainless to survive high temperature. They have a reddish or golden hue to them.
i