What are the general characteristics of bronze? I am interested in using bronze for foundry work in making my own castings for models. Particularly steam engines. I do know that bronze is softer than cast iron, which would mean that it would wear faster. Given that a model would not likely be under any significant load, I figure this would not be a problem. I am also to understand that bronze alloys expand under heat at different rates from cast iron. I look forward to your input.