With increase in carbon content in high strength low alloy steels
1.Toughness will increase and hardness/strength will decrease
2. Toughness will decrease and hardness/strength will increase
3. Toughness, hardness and strength will increase
4.Toughness, hardness and strength will decrease
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2. Ductility, and hence toughness will decrease with added carbon in sub-eutectoid steels, but will gain hardenability & carbide formation, giving strength and rigidity, but increasing brittleness.
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