THE place to go in Chennai to buy anything stainless-steel is Ratna Stores in T Nagar. Its 4 floors of absolutely everything. And I mean Everything! I went to buy a simple idli pan and came back armed with stuff I knew I did not need!
The ground floor is filled with every single possible kitchen utensil. And when I say filled, I mean literally from floor to ceiling. Its quite a sight. One floor has all things plastic, one has electronics and so on. It was a fantastic experience. The service is amazing. There are service people everywhere who basically "attach" themselves onto you as you enter the store, and they don't leave your side until you've finished paying and even walk you to your vehicle (since you'll need all the help you can get lugging the large shopping bags!). Every chennai-ite and all visitors must visit just to go through the experience and I know you will find something there that you feel you absolutely must have!