Present-day wrought metal items are usually made from hot rolled, low carbon steel or duct alloys of which two elements?

• A. Aluminum
• B. Copper
• C. Iron
• D. Aluminum and Copper

Answer: (D)

Wrought metal items today come from two common families: hot-rolled low-carbon steel (which is iron with a small amount of carbon) and ductile aluminum alloys. The aluminum alloys are made by combining aluminum with alloying elements to greatly improve strength while remaining workable; copper is a primary alloying element in many of these high-strength aluminum alloys. So, the two elements in those ductile alloys are aluminum and copper. The other options don’t fit because iron represents the steel family, and aluminum or copper alone don’t describe the ductile aluminum-copper alloys used in most wrought products.