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Effect of small boron additions to steel A small percentage of boron is added to steels primarily to achieve which effect? Choose the correct option.

Difficulty: Easy

Increase hardenability
Reduce machinability
Increase wear resistance
Increase endurance strength

Correct Answer: Increase hardenability

Explanation:

Concept
Minute additions of boron (on the order of tens of ppm) markedly increase hardenability by reducing the tendency for ferrite/pearlite to form at prior austenite grain boundaries, allowing deeper martensitic transformation on quenching.

Final Answer
Increase hardenability

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