Alloy steels containing more than 0.20% carbon are generally considered heat-treatable. Which option correctly reflects this statement in a test-choice format?

Alloy steels containing more than 0.20% carbon are generally considered heat-treatable. Which option correctly reflects this statement in a test-choice format?

• A. non-heat-treatable
• B. heat treatable
• C. non-magnetic
• D. only weldable at high temperature

Answer: (B)

The main idea is that carbon content in steels determines how they respond to heat treatment. When carbon is above about 0.20%, the steel can form hard microstructures such as martensite through quenching and tempering, making it capable of undergoing heat treatment to improve properties like hardness and strength. Therefore, the choice that states the steel is heat treatable best reflects the given statement. The other options don’t fit because they either deny the heat-treatable capability, or they bring up unrelated factors like magnetism or welding behavior, which aren’t what this question is about.

The main idea is that carbon content in steels determines how they respond to heat treatment. When carbon is above about 0.20%, the steel can form hard microstructures such as martensite through quenching and tempering, making it capable of undergoing heat treatment to improve properties like hardness and strength. Therefore, the choice that states the steel is heat treatable best reflects the given statement. The other options don’t fit because they either deny the heat-treatable capability, or they bring up unrelated factors like magnetism or welding behavior, which aren’t what this question is about.