Increasing carbon content in steel, _________ ultimate strength a
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Increasing carbon content in steel, _________ ultimate strength and ____ ductility of steel.
A. increases, decreases
B. decreases, decreases
C. increases, increases
D. decreases, increases
Please scroll down to see the correct answer and solution guide.
Right Answer is: A
SOLUTION
Explanation:
Carbon steel is an alloy of iron and carbon.
As the carbon content increases:
- The ultimate strength of steel increases.
- The elongation before fracture decreases.
- The ductility of the metal decreases.
- Increasing carbon also reduces the weldability, especially above 0.25% carbon.
- Plasticity and ductility are similar.
Generally, carbon is the most important commercial steel alloy. Increasing carbon content increases hardness and strength and improves hardenability.