Alloying elements added in more than 5% of the alloy yield which types of properties?

• A. Special properties such as corrosion resistance and temperature stability
• B. Only increased hardness
• C. No effect on properties
• D. Only improved machinability

Answer: (A)

When a significant portion of the alloy—the elements exceed roughly five percent—comes from alloying, it tends to change the internal structure enough to produce distinct, practical properties. These substantial additions often give you corrosion resistance and stability at high temperatures by forming protective films or stable phases that withstand aggressive environments and heat. That’s why alloys with higher alloying content are chosen for demanding applications like stainless steels and high-temperature alloys.

While you might also see changes in hardness or other traits, the standout effect of notable alloying is these special properties—corrosion resistance and temperature stability. The other options don’t fit because adding alloying elements does do something to properties, and the emphasis isn’t limited to just hardness or just machinability.