Chemical analysis in metallurgy?

All materials are made from chemicals and have a chemical composition. Doesn't matter if its steel, iron, bronze, brass or plastic. It is this chemical composition and the ratios of its chemistry which makes the material what it is. For example a set ratio of zinc plus copper equals brass. If you have much higher copper then that ratios of zinc you get red brass. If you have higher zinc then you get yellow brass. Chemical analysis is the backbone of metallurgy because it tells you what is in the metal and what its properties are. Think of it like cooking. If you want to know what the cake is and make it...you need to know whats in it.