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Q: Select the correct statement related to increasing the carbon content in steel from 0.2 to 0.9 percent.
  • A. Increasing the carbon content in steel decreases the yield stress and increases the ductility.
  • B. Increasing the carbon content in steel increases the yield stress and reduces the ductility.
  • C. decreasing the carbon content in steel increases the yield stress and reduces the ductility.
  • D. Increasing the carbon content in steel decreases the yield stress and does not affect the ductility.
Correct Answer: Option B - As the carbon content increase– • The ultimate strength of steel increase. • Increasing carbon also reduce the weld-ability, especially above 0.25% carbon. • Generally, carbon is the most important commercial steel alloy, increasing carbon content increases hardness & strength also improve harden-ability.
B. As the carbon content increase– • The ultimate strength of steel increase. • Increasing carbon also reduce the weld-ability, especially above 0.25% carbon. • Generally, carbon is the most important commercial steel alloy, increasing carbon content increases hardness & strength also improve harden-ability.

Explanations:

As the carbon content increase– • The ultimate strength of steel increase. • Increasing carbon also reduce the weld-ability, especially above 0.25% carbon. • Generally, carbon is the most important commercial steel alloy, increasing carbon content increases hardness & strength also improve harden-ability.