So we use a niton gun at work but I really get to use it much. My question is how much does the chemistry of aluminum vary in each piece of cast, sheet or extrusion aluminum. I know semi wheels different from like car wheels but im not really sure the alloy responsible for that. I know its so the semi wheels can withstand more heat. At work im seperating different types of engine cast. Does the chemistry vary much from like a turbo to an oil pan? Can anyone give me as much aluminum information as possible?