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What is the amount of boron used in HPF steel?

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in Casting-Forming-Welding II by (119k points)
What is the amount of boron used in HPF steel?

(a) Less than 0.003%

(b) Less than 0.007%

(c) Less than 0.009%

(d) Less than 0.057%

The question was posed to me in unit test.

The question is from Inverse Rate Curves for Steel in division Heat treatment of Metals and Alloys of Casting-Forming-Welding II

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Right choice is (a) Less than 0.003%

Easy explanation: The boron content which is used in HPF steel is extremely less in percentage composition. The amount of boron used in terms of percentage weight is less than 0.003%.

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